diff --git a/web/workspace/deno.json b/web/workspace/deno.json
index 674b94556..fb402a999 100644
--- a/web/workspace/deno.json
+++ b/web/workspace/deno.json
@@ -6,7 +6,8 @@
     "dev": "deno run -A npm:vite@7.2.7 dev",
     "dev:backend": "cd ../.. && cargo run -p yoi-workspace-server --bin yoi-server -- serve --listen 127.0.0.1:8787",
     "check": "deno run -A npm:@sveltejs/kit@2.49.4 sync && deno run -A npm:svelte-check@4.3.4 --tsconfig ./tsconfig.json",
-    "test": "deno test --allow-read=src,test,tests --allow-env=LOG,VSCODE_TEXTMATE_DEBUG,NODE_ENV tests/workspace-model.test.ts tests/workspace-catalog.test.ts tests/profile-api.test.ts tests/skill-api.test.ts src/lib/workspace/auth/model.test.ts tests/auth-api.test.ts src/lib/workspace/api/http.test.ts src/lib/workspace/api/workers.test.ts src/lib/workspace/header/breadcrumb-model.test.ts src/lib/workspace/console/chat-submit.test.ts src/lib/workspace/console/composer-delivery.test.ts test/composer-history.test.ts tests/composer-paste.test.ts src/lib/workspace/console/composer-command.test.ts src/lib/workspace/console/composer-draft.test.ts src/lib/workspace/console/composer-completion.test.ts src/lib/workspace/console/markdown.test.ts test/console/ansi.test.ts src/lib/workspace/console/model.test.ts src/lib/workspace/console/run-status.test.ts src/lib/workspace/companion/api.test.ts tests/workdir-api.test.ts src/lib/workspace/console/tasks.test.ts test/ticket-detail-route-reuse.test.ts test/objective-pages.test.ts test/repositories/ui.test.ts src/lib/workspace/console/worker-console.ui.test.ts src/lib/workspace/settings/model.test.ts tests/runtime-connection.test.ts tests/runtime-management.test.ts tests/runtime-management-source.test.ts src/lib/workspace/sidebar/override-stack.test.ts src/lib/workspace/sidebar/workers.test.ts src/lib/workspace/sidebar/workspace-switcher.test.ts src/lib/workspace/sidebar/worker-subscription.test.ts src/lib/workspace/sidebar/worker-launch.test.ts test/sidebar/worker-actions.test.ts src/lib/workspace/tickets/merge-request-resources.test.ts src/lib/workspace/tickets/ticket-panel.test.ts test/merge-request-status.test.ts test/config-source/decodal-grammar.test.ts test/config-source/editor-state.test.ts test/config-source/fixed-schema-wrapper.test.ts test/config-source/toolchain.test.ts test/config-source/wasm-parity.test.ts test/repository-access/api.test.ts test/repository-access/loader.test.ts test/repository-access/ui.test.ts test/repository-ssh-connection-ui.test.ts",
+    "test": "deno test --allow-read=src,test,tests --allow-env=LOG,VSCODE_TEXTMATE_DEBUG,NODE_ENV tests/workspace-model.test.ts tests/workspace-catalog.test.ts tests/profile-api.test.ts tests/skill-api.test.ts src/lib/workspace/auth/model.test.ts tests/auth-api.test.ts src/lib/workspace/api/http.test.ts src/lib/workspace/api/workers.test.ts src/lib/workspace/header/breadcrumb-model.test.ts src/lib/workspace/console/chat-submit.test.ts src/lib/workspace/console/composer-delivery.test.ts test/composer-history.test.ts tests/composer-paste.test.ts src/lib/workspace/console/composer-command.test.ts src/lib/workspace/console/composer-draft.test.ts src/lib/workspace/console/composer-completion.test.ts test/console/ansi.test.ts src/lib/workspace/console/model.test.ts src/lib/workspace/console/run-status.test.ts src/lib/workspace/companion/api.test.ts tests/workdir-api.test.ts src/lib/workspace/console/tasks.test.ts test/ticket-detail-route-reuse.test.ts test/objective-pages.test.ts test/repositories/ui.test.ts src/lib/workspace/console/worker-console.ui.test.ts src/lib/workspace/settings/model.test.ts tests/runtime-connection.test.ts tests/runtime-management.test.ts tests/runtime-management-source.test.ts src/lib/workspace/sidebar/override-stack.test.ts src/lib/workspace/sidebar/workers.test.ts src/lib/workspace/sidebar/workspace-switcher.test.ts src/lib/workspace/sidebar/worker-subscription.test.ts src/lib/workspace/sidebar/worker-launch.test.ts test/sidebar/worker-actions.test.ts src/lib/workspace/tickets/merge-request-resources.test.ts src/lib/workspace/tickets/ticket-panel.test.ts test/merge-request-status.test.ts test/config-source/decodal-grammar.test.ts test/config-source/editor-state.test.ts test/config-source/fixed-schema-wrapper.test.ts test/config-source/toolchain.test.ts test/config-source/wasm-parity.test.ts test/repository-access/api.test.ts test/repository-access/loader.test.ts test/repository-access/ui.test.ts test/repository-ssh-connection-ui.test.ts",
+    "test:component": "deno run -A npm:vitest@3.2.4 run --config vitest.config.ts",
     "build": "deno run -A npm:vite@7.2.7 build",
     "preview": "deno run -A npm:vite@7.2.7 preview"
   },
@@ -27,7 +28,7 @@
     "cookie": "npm:cookie@0.6.0",
     "devalue": "npm:devalue@5.6.4",
     "set-cookie-parser": "npm:set-cookie-parser@2.7.2",
-    "shiki": "npm:shiki@3.13.0",
+    "shiki": "npm:shiki@4.4.2",
     "svelte": "npm:svelte@5.45.6",
     "svelte-check": "npm:svelte-check@4.3.4",
     "typescript": "npm:typescript@5.9.3",
diff --git a/web/workspace/deno.lock b/web/workspace/deno.lock
index dc902d3a4..448a14620 100644
--- a/web/workspace/deno.lock
+++ b/web/workspace/deno.lock
@@ -9,23 +9,27 @@
     "npm:@codemirror/state@6.7.1": "6.7.1",
     "npm:@codemirror/view@6.43.8": "6.43.8",
     "npm:@fontsource/ibm-plex-mono@5.3.0": "5.3.0",
+    "npm:@humanspeak/svelte-markdown@1.9.1": "1.9.1_shiki@4.4.2_svelte@5.45.6",
     "npm:@lezer/common@1.5.2": "1.5.2",
     "npm:@lezer/highlight@1.2.3": "1.2.3",
     "npm:@sveltejs/adapter-static@3.0.9": "3.0.9_@sveltejs+kit@2.49.4__@sveltejs+vite-plugin-svelte@6.2.1___svelte@5.45.6___vite@7.2.7____yaml@2.9.0___yaml@2.9.0__svelte@5.45.6__typescript@5.9.3__vite@7.2.7___yaml@2.9.0__yaml@2.9.0_yaml@2.9.0",
     "npm:@sveltejs/kit@2.49.4": "2.49.4_@sveltejs+vite-plugin-svelte@6.2.1__svelte@5.45.6__vite@7.2.7___yaml@2.9.0__yaml@2.9.0_svelte@5.45.6_typescript@5.9.3_vite@7.2.7__yaml@2.9.0_yaml@2.9.0",
     "npm:@sveltejs/vite-plugin-svelte@6.2.1": "6.2.1_svelte@5.45.6_vite@7.2.7__yaml@2.9.0_yaml@2.9.0",
+    "npm:@testing-library/svelte@5.2.8": "5.2.8_svelte@5.45.6_vite@7.2.7__yaml@2.9.0_vitest@3.2.4__happy-dom@18.0.1_happy-dom@18.0.1",
     "npm:clsx@2.1.1": "2.1.1",
     "npm:cookie@0.6.0": "0.6.0",
     "npm:decodal-codemirror@0.3.0": "0.3.0_@codemirror+language@6.12.4_@codemirror+view@6.43.8_@lezer+highlight@1.2.3_@lezer+lr@1.4.10",
     "npm:devalue@5.6.4": "5.6.4",
     "npm:gen-interface-jp@0.8.0": "0.8.0",
+    "npm:happy-dom@18.0.1": "18.0.1",
     "npm:set-cookie-parser@2.7.2": "2.7.2",
-    "npm:shiki@3.13.0": "3.13.0",
+    "npm:shiki@4.4.2": "4.4.2",
     "npm:sv@*": "0.10.8",
     "npm:svelte-check@4.3.4": "4.3.4_svelte@5.45.6_typescript@5.9.3",
     "npm:svelte@5.45.6": "5.45.6",
     "npm:typescript@5.9.3": "5.9.3",
     "npm:vite@7.2.7": "7.2.7_yaml@2.9.0",
+    "npm:vitest@3.2.4": "3.2.4_happy-dom@18.0.1",
     "npm:yaml@2.9.0": "2.9.0"
   },
   "jsr": {
@@ -40,6 +44,20 @@
     }
   },
   "npm": {
+    "@babel/code-frame@7.29.7": {
+      "integrity": "sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==",
+      "dependencies": [
+        "@babel/helper-validator-identifier",
+        "js-tokens@4.0.0",
+        "picocolors"
+      ]
+    },
+    "@babel/helper-validator-identifier@7.29.7": {
+      "integrity": "sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg=="
+    },
+    "@babel/runtime@7.29.7": {
+      "integrity": "sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw=="
+    },
     "@codemirror/autocomplete@6.20.0": {
       "integrity": "sha512-bOwvTOIJcG5FVo5gUUupiwYh8MioPLQ4UcqbcRf7UQ98X90tCa9E1kZ3Z7tqwpZxYyOvh1YTYbmZE9RTfTp5hg==",
       "dependencies": [
@@ -217,6 +235,23 @@
     "@fontsource/ibm-plex-mono@5.3.0": {
       "integrity": "sha512-eTgnZjZEGk1QtD3ZstF+Vclo2HLAni8YMy34/DxllwZvyz1lR/1RF/xTiAquOBO7MvqBx8D2Ig2WCPMVfdZu7Q=="
     },
+    "@humanspeak/memory-cache@1.2.0": {
+      "integrity": "sha512-im7GIIpgjdD6Fx68xCeiXw3XiDv30/WMRAaodMm+ep0ptYfEUd0cdNeTAylHGIRTJIeByKFHdTmPjAktyDM/JQ=="
+    },
+    "@humanspeak/svelte-markdown@1.9.1_shiki@4.4.2_svelte@5.45.6": {
+      "integrity": "sha512-2JjpATdZfhGQurV38LtkUkPkyQzM7eXku6LoDBeK6i69qqOe0OLmMwpqtMnhwG3ItdxXOt/3miPbSaNTFqMl5Q==",
+      "dependencies": [
+        "@humanspeak/memory-cache",
+        "github-slugger",
+        "htmlparser2",
+        "marked",
+        "shiki",
+        "svelte"
+      ],
+      "optionalPeers": [
+        "shiki"
+      ]
+    },
     "@jridgewell/gen-mapping@0.3.13": {
       "integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
       "dependencies": [
@@ -390,44 +425,53 @@
       "os": ["win32"],
       "cpu": ["x64"]
     },
-    "@shikijs/core@3.13.0": {
-      "integrity": "sha512-3P8rGsg2Eh2qIHekwuQjzWhKI4jV97PhvYjYUzGqjvJfqdQPz+nMlfWahU24GZAyW1FxFI1sYjyhfh5CoLmIUA==",
+    "@shikijs/core@4.4.2": {
+      "integrity": "sha512-StyzbAyxg2/tBGf78gwbBkGyeQ73lf8UiJArFaQhTQIDqQOCKPCQFanvrs4/Yv3Yfyc+ONInJM6K+FMIf+P+kA==",
       "dependencies": [
+        "@shikijs/primitive",
         "@shikijs/types",
         "@shikijs/vscode-textmate",
         "@types/hast",
         "hast-util-to-html"
       ]
     },
-    "@shikijs/engine-javascript@3.13.0": {
-      "integrity": "sha512-Ty7xv32XCp8u0eQt8rItpMs6rU9Ki6LJ1dQOW3V/56PKDcpvfHPnYFbsx5FFUP2Yim34m/UkazidamMNVR4vKg==",
+    "@shikijs/engine-javascript@4.4.2": {
+      "integrity": "sha512-MnIkeqWdVPUWsxlx8gKLVCJFTsqrQJgpTPBPpQwaFeJ56lOnJxj5aN2LUFnfxUEcvOQuNocmbaMnVrCEln6rkw==",
       "dependencies": [
         "@shikijs/types",
         "@shikijs/vscode-textmate",
         "oniguruma-to-es"
       ]
     },
-    "@shikijs/engine-oniguruma@3.13.0": {
-      "integrity": "sha512-O42rBGr4UDSlhT2ZFMxqM7QzIU+IcpoTMzb3W7AlziI1ZF7R8eS2M0yt5Ry35nnnTX/LTLXFPUjRFCIW+Operg==",
+    "@shikijs/engine-oniguruma@4.4.2": {
+      "integrity": "sha512-GLhowz1+jixjz+wiZ3wMnOn1jTxiFCGl2PkXufivbnwPHKuyw1AYqu5/hbWhZZ2oAb0NP05WUJhYeigY14drnw==",
       "dependencies": [
         "@shikijs/types",
         "@shikijs/vscode-textmate"
       ]
     },
-    "@shikijs/langs@3.13.0": {
-      "integrity": "sha512-672c3WAETDYHwrRP0yLy3W1QYB89Hbpj+pO4KhxK6FzIrDI2FoEXNiNCut6BQmEApYLfuYfpgOZaqbY+E9b8wQ==",
+    "@shikijs/langs@4.4.2": {
+      "integrity": "sha512-8DfeusD+Zdv/eYIDdXyJTUnSMHt+aAWjAOCXV20HNGAHRlInXpG8wh421v6B91WOm9TFwRLN+b/LG5F2NAIojg==",
       "dependencies": [
         "@shikijs/types"
       ]
     },
-    "@shikijs/themes@3.13.0": {
-      "integrity": "sha512-Vxw1Nm1/Od8jyA7QuAenaV78BG2nSr3/gCGdBkLpfLscddCkzkL36Q5b67SrLLfvAJTOUzW39x4FHVCFriPVgg==",
+    "@shikijs/primitive@4.4.2": {
+      "integrity": "sha512-l6fQQKsOMlz72n38fztmSgZ76MO6KSWuw8o+GJ+FhmqrpC9pIOJNQNXGgbb5yX2AwpzlEHwsaLPnk/8o4Fm+rA==",
+      "dependencies": [
+        "@shikijs/types",
+        "@shikijs/vscode-textmate",
+        "@types/hast"
+      ]
+    },
+    "@shikijs/themes@4.4.2": {
+      "integrity": "sha512-H0CFoL07ddDC2Dd6EdrPYNkRhUR6YCkJlnuYFceYYUJJA5TIm2b5B33qqiDYryBExgbKMndFJPb2u1gTuqO37g==",
       "dependencies": [
         "@shikijs/types"
       ]
     },
-    "@shikijs/types@3.13.0": {
-      "integrity": "sha512-oM9P+NCFri/mmQ8LoFGVfVyemm5Hi27330zuOBp0annwJdKH1kOLndw3zCtAVDehPLg9fKqoEx3Ht/wNZxolfw==",
+    "@shikijs/types@4.4.2": {
+      "integrity": "sha512-PFYitV4vpDr/iPCIhnHp+Q4ftic5N5VeNJ3KQ1O8gn3h2ar8qgwMAXF7tq4m1CWaMS60fV4VqF6vfnWH4F7vqQ==",
       "dependencies": [
         "@shikijs/vscode-textmate",
         "@types/hast"
@@ -498,14 +542,53 @@
         "vitefu"
       ]
     },
+    "@testing-library/dom@10.4.2": {
+      "integrity": "sha512-yzr2S9HyAIdhz2/6qHgbs665Q7PKVcDF05vsOlHPxG1mo36gKVesdYVeDLnXgfjJ03CrKRk08knc6+E/9m8v2Q==",
+      "dependencies": [
+        "@babel/code-frame",
+        "@babel/runtime",
+        "@types/aria-query",
+        "aria-query@5.3.0",
+        "dom-accessibility-api",
+        "lz-string",
+        "picocolors",
+        "pretty-format"
+      ]
+    },
+    "@testing-library/svelte@5.2.8_svelte@5.45.6_vite@7.2.7__yaml@2.9.0_vitest@3.2.4__happy-dom@18.0.1_happy-dom@18.0.1": {
+      "integrity": "sha512-ucQOtGsJhtawOEtUmbR4rRh53e6RbM1KUluJIXRmh6D4UzxR847iIqqjRtg9mHNFmGQ8Vkam9yVcR5d1mhIHKA==",
+      "dependencies": [
+        "@testing-library/dom",
+        "svelte",
+        "vite",
+        "vitest"
+      ],
+      "optionalPeers": [
+        "vite",
+        "vitest"
+      ]
+    },
+    "@types/aria-query@5.0.4": {
+      "integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw=="
+    },
+    "@types/chai@5.2.3": {
+      "integrity": "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA==",
+      "dependencies": [
+        "@types/deep-eql",
+        "assertion-error"
+      ]
+    },
     "@types/cookie@0.6.0": {
       "integrity": "sha512-4Kh9a6B2bQciAhf7FSuMRRkUWecJgJu9nPnx3yzpsfXX/c50REIqpHY4C82bXP90qrLtXtkDxTZosYO3UpOwlA=="
     },
+    "@types/deep-eql@4.0.2": {
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw=="
+    },
     "@types/estree@1.0.8": {
       "integrity": "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w=="
     },
-    "@types/hast@3.0.4": {
-      "integrity": "sha512-WPs+bbQw5aCj+x6laNGWLH3wviHtoCv/P3+otBhbOhJgG8qtpdAMlTCxLtsTWA7LH1Oh/bFCHsBn0TPS5m30EQ==",
+    "@types/hast@3.0.5": {
+      "integrity": "sha512-rp/ezSWaD1m44dPKICGhiskI13nVr7qTloFwDa/IYkhhf5nzwP+zIQcIJh3WIFSBOy/H1PzB40jPjMDksN4F+g==",
       "dependencies": [
         "@types/unist"
       ]
@@ -516,9 +599,18 @@
         "@types/unist"
       ]
     },
+    "@types/node@20.19.43": {
+      "integrity": "sha512-6oYBAi5ikg4Pl+kGsoYtawUMBT2zZMCvPNF7pVLnHZfd1zf38DRiWn/gT01RYCdUqkv7Fhr+C9ot4/tb+2sVvA==",
+      "dependencies": [
+        "undici-types"
+      ]
+    },
     "@types/unist@3.0.3": {
       "integrity": "sha512-ko/gIFJRv177XgZsZcBwnqJN5x/Gien8qNOn0D5bQU/zAzVf9Zt3BlcUiLqhV9y4ARk0GbT3tnUiPNgnTXzc/Q=="
     },
+    "@types/whatwg-mimetype@3.0.2": {
+      "integrity": "sha512-c2AKvDT8ToxLIOUlN51gTiHXflsfIFisS4pO7pDPoKouJCESkhZnEy623gwP9laCy5lnLDAw1vAzu2vM2YLOrA=="
+    },
     "@typescript-eslint/types@8.57.2": {
       "integrity": "sha512-/iZM6FnM4tnx9csuTxspMW4BOSegshwX5oBDznJ7S4WggL7Vczz5d2W11ecc4vRrQMQHXRSxzrCsyG5EsPPTbA=="
     },
@@ -526,25 +618,114 @@
       "integrity": "sha512-WmoN8qaIAo7WTYWbAZuG8PYEhn5fkz7dZrqTBZ7dtt//lL2Gwms1IcnQ5yHqjDfX8Ft5j4YzDM23f87zBfDe9g==",
       "deprecated": true
     },
+    "@vitest/expect@3.2.4": {
+      "integrity": "sha512-Io0yyORnB6sikFlt8QW5K7slY4OjqNX9jmJQ02QDda8lyM6B5oNgVWoSoKPac8/kgnCUzuHQKrSLtu/uOqqrig==",
+      "dependencies": [
+        "@types/chai",
+        "@vitest/spy",
+        "@vitest/utils",
+        "chai",
+        "tinyrainbow"
+      ]
+    },
+    "@vitest/mocker@3.2.4_vite@7.2.7__yaml@2.9.0": {
+      "integrity": "sha512-46ryTE9RZO/rfDd7pEqFl7etuyzekzEhUbTW3BvmeO/BcCMEgq59BKhek3dXDWgAj4oMK6OZi+vRr1wPW6qjEQ==",
+      "dependencies": [
+        "@vitest/spy",
+        "estree-walker",
+        "magic-string",
+        "vite"
+      ],
+      "optionalPeers": [
+        "vite"
+      ]
+    },
+    "@vitest/pretty-format@3.2.4": {
+      "integrity": "sha512-IVNZik8IVRJRTr9fxlitMKeJeXFFFN0JaB9PHPGQ8NKQbGpfjlTx9zO4RefN8gp7eqjNy8nyK3NZmBzOPeIxtA==",
+      "dependencies": [
+        "tinyrainbow"
+      ]
+    },
+    "@vitest/runner@3.2.4": {
+      "integrity": "sha512-oukfKT9Mk41LreEW09vt45f8wx7DordoWUZMYdY/cyAk7w5TWkTRCNZYF7sX7n2wB7jyGAl74OxgwhPgKaqDMQ==",
+      "dependencies": [
+        "@vitest/utils",
+        "pathe",
+        "strip-literal"
+      ]
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@@ -775,9 +1045,20 @@
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@@ -853,6 +1134,9 @@
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@@ -914,6 +1210,12 @@
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     },
+    "tinypool@1.1.1": {
+      "integrity": "sha512-Zba82s87IFq9A9XmjiX5uZA/ARWDrB03OHlq+Vw1fSdt0I+4/Kutwy8BP4Y/y/aORMo61FQ0vIb5j44vSo5Pkg=="
+    },
+    "tinyrainbow@2.0.0": {
+      "integrity": "sha512-op4nsTR47R6p0vMUUoYl/a+ljLFVtlfaXkLQmqfLR1qHma1h/ysYk4hEXZ880bf2CYgTskvTa/e196Vd5dDQXw=="
+    },
+    "tinyspy@4.0.6": {
+      "integrity": "sha512-u8KszXvGfU68hVcZpRHKG28T0krMuv2G5nDhiHaMLen/gIuFEgIJhaJuO69qjnXg5paSrbPMFfx3brNuN8eVSg=="
+    },
     "totalist@3.0.1": {
       "integrity": "sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ=="
     },
@@ -931,6 +1242,9 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "bin": true
     },
+    "undici-types@6.21.0": {
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ=="
+    },
     "unist-util-is@6.0.1": {
       "integrity": "sha512-LsiILbtBETkDz8I9p1dQ0uyRUWuaQzd/cuEeS1hoRSyW5E5XGmTzlwY1OrNzzakGowI9Dr/I8HVaw4hTtnxy8g==",
       "dependencies": [
@@ -978,6 +1292,17 @@
         "vfile-message"
       ]
     },
+    "vite-node@3.2.4": {
+      "integrity": "sha512-EbKSKh+bh1E1IFxeO0pg1n4dvoOTt0UDiXMd/qn++r98+jPO1xtJilvXldeuQ8giIB5IkpjCgMleHMNEsGH6pg==",
+      "dependencies": [
+        "cac",
+        "debug",
+        "es-module-lexer",
+        "pathe",
+        "vite"
+      ],
+      "bin": true
+    },
     "vite@7.2.7_yaml@2.9.0": {
       "integrity": "sha512-ITcnkFeR3+fI8P1wMgItjGrR10170d8auB4EpMLPqmx6uxElH3a/hHGQabSHKdqd4FXWO1nFIp9rRn7JQ34ACQ==",
       "dependencies": [
@@ -1006,9 +1331,53 @@
         "vite"
       ]
     },
+    "vitest@3.2.4_happy-dom@18.0.1": {
+      "integrity": "sha512-LUCP5ev3GURDysTWiP47wRRUpLKMOfPh+yKTx3kVIEiu5KOMeqzpnYNsKyOoVrULivR8tLcks4+lga33Whn90A==",
+      "dependencies": [
+        "@types/chai",
+        "@vitest/expect",
+        "@vitest/mocker",
+        "@vitest/pretty-format",
+        "@vitest/runner",
+        "@vitest/snapshot",
+        "@vitest/spy",
+        "@vitest/utils",
+        "chai",
+        "debug",
+        "expect-type",
+        "happy-dom",
+        "magic-string",
+        "pathe",
+        "picomatch",
+        "std-env",
+        "tinybench",
+        "tinyexec",
+        "tinyglobby",
+        "tinypool",
+        "tinyrainbow",
+        "vite",
+        "vite-node",
+        "why-is-node-running"
+      ],
+      "optionalPeers": [
+        "happy-dom"
+      ],
+      "bin": true
+    },
     "w3c-keyname@2.2.8": {
       "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ=="
     },
+    "whatwg-mimetype@3.0.0": {
+      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q=="
+    },
+    "why-is-node-running@2.3.0": {
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dependencies": [
+        "siginfo",
+        "stackback"
+      ],
+      "bin": true
+    },
     "yaml@2.9.0": {
       "integrity": "sha512-2AvhNX3mb8zd6Zy7INTtSpl1F15HW6Wnqj0srWlkKLcpYl/gMIMJiyuGq2KeI2YFxUPjdlB+3Lc10seMLtL4cA==",
       "bin": true
@@ -1037,7 +1406,7 @@
       "npm:decodal-codemirror@0.3.0",
       "npm:devalue@5.6.4",
       "npm:set-cookie-parser@2.7.2",
-      "npm:shiki@3.13.0",
+      "npm:shiki@4.4.2",
       "npm:svelte-check@4.3.4",
       "npm:svelte@5.45.6",
       "npm:typescript@5.9.3",
@@ -1046,7 +1415,12 @@
     "packageJson": {
       "dependencies": [
         "npm:@fontsource/ibm-plex-mono@5.3.0",
+        "npm:@humanspeak/svelte-markdown@1.9.1",
+        "npm:@testing-library/svelte@5.2.8",
         "npm:gen-interface-jp@0.8.0",
+        "npm:happy-dom@18.0.1",
+        "npm:shiki@4.4.2",
+        "npm:vitest@3.2.4",
         "npm:yaml@2.9.0"
       ]
     }
diff --git a/web/workspace/package.json b/web/workspace/package.json
index 21d7a9c31..d158b403a 100644
--- a/web/workspace/package.json
+++ b/web/workspace/package.json
@@ -5,7 +5,14 @@
   "type": "module",
   "dependencies": {
     "@fontsource/ibm-plex-mono": "5.3.0",
+    "@humanspeak/svelte-markdown": "1.9.1",
     "gen-interface-jp": "0.8.0",
+    "shiki": "4.4.2",
     "yaml": "2.9.0"
+  },
+  "devDependencies": {
+    "@testing-library/svelte": "5.2.8",
+    "happy-dom": "18.0.1",
+    "vitest": "3.2.4"
   }
 }
diff --git a/web/workspace/src/lib/workspace/console/ConsoleLineItem.svelte b/web/workspace/src/lib/workspace/console/ConsoleLineItem.svelte
index a53e3fa3d..f91f00f45 100644
--- a/web/workspace/src/lib/workspace/console/ConsoleLineItem.svelte
+++ b/web/workspace/src/lib/workspace/console/ConsoleLineItem.svelte
@@ -133,7 +133,7 @@
   {:else if item.kind === 'user'}
     <div class="user-message">
       <span class="user-prompt" aria-hidden="true">&gt;</span>
-      <div><RichMarkdown text={item.body || '—'} /></div>
+      <div><RichMarkdown text={item.body || '—'} streamId={item.id} /></div>
     </div>
   {:else if item.kind === 'activity'}
     <p class="activity-summary">{item.body || '—'}</p>
@@ -142,7 +142,7 @@
   {:else if item.kind === 'run_stats'}
     <p class="run-stats">{item.body}</p>
   {:else if shouldRenderMarkdown(item)}
-    <RichMarkdown text={item.body || '—'} />
+    <RichMarkdown text={item.body || '—'} streamId={item.id} />
   {:else}
     <p class="console-plain-text">{item.body || '—'}</p>
   {/if}
diff --git a/web/workspace/src/lib/workspace/console/MarkdownLink.svelte b/web/workspace/src/lib/workspace/console/MarkdownLink.svelte
new file mode 100644
index 000000000..fd1cd2bf4
--- /dev/null
+++ b/web/workspace/src/lib/workspace/console/MarkdownLink.svelte
@@ -0,0 +1,17 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+
+  let {
+    href = "",
+    title,
+    children,
+  }: {
+    href?: string;
+    title?: string;
+    children?: Snippet;
+  } = $props();
+</script>
+
+<a {href} {title} target="_blank" rel="noreferrer">
+  {@render children?.()}
+</a>
diff --git a/web/workspace/src/lib/workspace/console/RichMarkdown.browser.spec.ts b/web/workspace/src/lib/workspace/console/RichMarkdown.browser.spec.ts
new file mode 100644
index 000000000..42650f66a
--- /dev/null
+++ b/web/workspace/src/lib/workspace/console/RichMarkdown.browser.spec.ts
@@ -0,0 +1,70 @@
+// @vitest-environment happy-dom
+
+import { cleanup, render, waitFor } from "@testing-library/svelte";
+import { afterEach, expect, test } from "vitest";
+import RichMarkdown from "./RichMarkdown.svelte";
+
+afterEach(cleanup);
+
+test("preserves safe links, blocks raw HTML, and renders Shiki code", async () => {
+  const source = [
+    "[unsafe](javascript:alert(1)) and [safe](https://example.com)",
+    "",
+    '<img src="x" onerror="alert(1)">',
+    "",
+    "```ts",
+    "const answer: number = 42;",
+    "```",
+  ].join("\n");
+  const { container } = render(RichMarkdown, {
+    text: source,
+    streamId: "message-security",
+  });
+
+  await waitFor(() => {
+    expect(container.querySelectorAll("a")).toHaveLength(2);
+    expect(container.querySelector("pre.shiki code span")).not.toBeNull();
+  });
+
+  const [unsafe, safe] = container.querySelectorAll("a");
+  expect(unsafe.getAttribute("href")).toBe("");
+  expect(safe.getAttribute("href")).toBe("https://example.com");
+  expect(safe.getAttribute("target")).toBe("_blank");
+  expect(safe.getAttribute("rel")).toBe("noreferrer");
+  expect(container.querySelector("img")).toBeNull();
+  expect(container.querySelector("script")).toBeNull();
+});
+
+test("keeps completed DOM nodes while a later markdown block grows", async () => {
+  const initial = [
+    "# Stable heading",
+    "",
+    "This paragraph is already complete.",
+    "",
+    "The final paragraph is stream",
+  ].join("\n");
+  const { container, rerender } = render(RichMarkdown, {
+    text: initial,
+    streamId: "message-1",
+  });
+
+  await waitFor(() => {
+    expect(container.querySelector("h1")?.textContent).toBe("Stable heading");
+    expect(container.querySelectorAll("p")).toHaveLength(2);
+  });
+  const heading = container.querySelector("h1");
+  const completedParagraph = container.querySelector("p");
+
+  await rerender({
+    text: `${initial}ed incrementally.`,
+    streamId: "message-1",
+  });
+  await waitFor(() => {
+    expect(container.querySelectorAll("p")[1]?.textContent).toBe(
+      "The final paragraph is streamed incrementally.",
+    );
+  });
+
+  expect(container.querySelector("h1")).toBe(heading);
+  expect(container.querySelector("p")).toBe(completedParagraph);
+});
diff --git a/web/workspace/src/lib/workspace/console/RichMarkdown.svelte b/web/workspace/src/lib/workspace/console/RichMarkdown.svelte
index da585bd38..c609ec121 100644
--- a/web/workspace/src/lib/workspace/console/RichMarkdown.svelte
+++ b/web/workspace/src/lib/workspace/console/RichMarkdown.svelte
@@ -1,41 +1,49 @@
+<script module lang="ts">
+  import {
+    createShikiHighlighter,
+    setShikiHighlighter,
+  } from "@humanspeak/svelte-markdown/extensions/shiki";
+  import bash from "shiki/langs/bash.mjs";
+  import javascript from "shiki/langs/javascript.mjs";
+  import json from "shiki/langs/json.mjs";
+  import python from "shiki/langs/python.mjs";
+  import rust from "shiki/langs/rust.mjs";
+  import typescript from "shiki/langs/typescript.mjs";
+  import kanagawaWave from "shiki/themes/kanagawa-wave.mjs";
+
+  setShikiHighlighter(
+    createShikiHighlighter({
+      themes: [kanagawaWave],
+      langs: [bash, javascript, json, python, rust, typescript],
+    }),
+  );
+</script>
+
 <script lang="ts">
-  import { markdownToHtml } from "$lib/workspace/console/markdown";
+  import SvelteMarkdown, {
+    buildUnsupportedHTML,
+    type Renderers,
+  } from "@humanspeak/svelte-markdown";
+  import { ShikiCode } from "@humanspeak/svelte-markdown/extensions/shiki";
+  import MarkdownLink from "$lib/workspace/console/MarkdownLink.svelte";
 
   type Props = {
     text: string;
+    streamId?: string | number;
     class?: string;
   };
 
-  let { text, class: className = "" }: Props = $props();
-  let html = $state("");
-  let rendering = $state(false);
+  let { text, streamId = "static", class: className = "" }: Props = $props();
 
-  async function render(value: string): Promise<void> {
-    const current = value;
-    rendering = true;
-    try {
-      const next = await markdownToHtml(current);
-      if (text === current) {
-        html = next;
-      }
-    } finally {
-      if (text === current) {
-        rendering = false;
-      }
-    }
-  }
-
-  $effect(() => {
-    void render(text);
-  });
+  const renderers = {
+    code: ShikiCode,
+    html: buildUnsupportedHTML(),
+    link: MarkdownLink,
+  } satisfies Partial<Renderers>;
 </script>
 
-<div class={`rich-markdown ${className}`} class:is-rendering={rendering}>
-  {#if html}
-    {@html html}
-  {:else}
-    <p>{text}</p>
-  {/if}
+<div class={`rich-markdown ${className}`}>
+  <SvelteMarkdown source={text} {streamId} {renderers} streaming />
 </div>
 
 <style>
diff --git a/web/workspace/src/lib/workspace/console/markdown.test.ts b/web/workspace/src/lib/workspace/console/markdown.test.ts
deleted file mode 100644
index 641e490a2..000000000
--- a/web/workspace/src/lib/workspace/console/markdown.test.ts
+++ /dev/null
@@ -1,36 +0,0 @@
-import { markdownToHtml } from "./markdown.ts";
-
-declare const Deno: {
-  test(name: string, fn: () => void | Promise<void>): void;
-};
-
-function assert(condition: unknown, message: string): asserts condition {
-  if (!condition) {
-    throw new Error(message);
-  }
-}
-
-Deno.test("markdownToHtml escapes raw html and renders basic markdown", async () => {
-  const html = await markdownToHtml(
-    "# Title\n\nhello **world** `<x>`\n\n<script>bad()</script>",
-  );
-  assert(html.includes("<h1>Title</h1>"), "heading should render");
-  assert(html.includes("<strong>world</strong>"), "strong should render");
-  assert(
-    html.includes("&lt;script&gt;bad()&lt;/script&gt;"),
-    "raw html should be escaped",
-  );
-  assert(
-    !html.includes("<script>bad()</script>"),
-    "raw html must not pass through",
-  );
-});
-
-Deno.test("markdownToHtml renders fenced code through shiki", async () => {
-  const html = await markdownToHtml("```ts\nconst answer: number = 42;\n```");
-  assert(
-    html.includes("shiki"),
-    "highlighted code should include shiki markup",
-  );
-  assert(html.includes("answer"), "code content should be present");
-});
diff --git a/web/workspace/src/lib/workspace/console/markdown.ts b/web/workspace/src/lib/workspace/console/markdown.ts
deleted file mode 100644
index 1b3f60b8c..000000000
--- a/web/workspace/src/lib/workspace/console/markdown.ts
+++ /dev/null
@@ -1,225 +0,0 @@
-import { codeToHtml } from "shiki";
-
-const SHIKI_THEME = "kanagawa-wave";
-
-export async function markdownToHtml(markdown: string): Promise<string> {
-  if (!markdown.trim()) {
-    return "";
-  }
-  const blocks = splitFencedCode(markdown);
-  const html: string[] = [];
-  let textBuffer: string[] = [];
-
-  async function flushText(): Promise<void> {
-    if (textBuffer.length === 0) {
-      return;
-    }
-    html.push(renderMarkdownText(textBuffer.join("\n")));
-    textBuffer = [];
-  }
-
-  for (const block of blocks) {
-    if (block.kind === "text") {
-      textBuffer.push(block.text);
-      continue;
-    }
-    await flushText();
-    html.push(await highlightCode(block.code, block.lang));
-  }
-  await flushText();
-  return html.join("\n");
-}
-
-type MarkdownBlock =
-  | { kind: "text"; text: string }
-  | { kind: "code"; lang: string; code: string };
-
-function splitFencedCode(markdown: string): MarkdownBlock[] {
-  const lines = markdown.split(/\r?\n/);
-  const blocks: MarkdownBlock[] = [];
-  let text: string[] = [];
-  let code: string[] | null = null;
-  let lang = "text";
-
-  for (const line of lines) {
-    const fence = line.match(/^```\s*([^`]*)\s*$/);
-    if (fence) {
-      if (code) {
-        blocks.push({ kind: "text", text: text.join("\n") });
-        text = [];
-        blocks.push({ kind: "code", lang, code: code.join("\n") });
-        code = null;
-        lang = "text";
-      } else {
-        if (text.length > 0) {
-          blocks.push({ kind: "text", text: text.join("\n") });
-          text = [];
-        }
-        lang = normalizeLanguage(fence[1]);
-        code = [];
-      }
-      continue;
-    }
-    if (code) {
-      code.push(line);
-    } else {
-      text.push(line);
-    }
-  }
-
-  if (code) {
-    text.push("```" + (lang === "text" ? "" : lang));
-    text.push(...code);
-  }
-  if (text.length > 0) {
-    blocks.push({ kind: "text", text: text.join("\n") });
-  }
-
-  return blocks.filter((block) =>
-    block.kind === "code" || block.text.trim().length > 0
-  );
-}
-
-function renderMarkdownText(markdown: string): string {
-  const lines = markdown.split(/\r?\n/);
-  const html: string[] = [];
-  let paragraph: string[] = [];
-  let list: string[] = [];
-  let blockquote: string[] = [];
-
-  function flushParagraph(): void {
-    if (paragraph.length === 0) {
-      return;
-    }
-    html.push(`<p>${paragraph.map(renderInline).join("<br>")}</p>`);
-    paragraph = [];
-  }
-
-  function flushList(): void {
-    if (list.length === 0) {
-      return;
-    }
-    html.push(
-      `<ul>${
-        list.map((item) => `<li>${renderInline(item)}</li>`).join("")
-      }</ul>`,
-    );
-    list = [];
-  }
-
-  function flushBlockquote(): void {
-    if (blockquote.length === 0) {
-      return;
-    }
-    html.push(
-      `<blockquote>${blockquote.map(renderInline).join("<br>")}</blockquote>`,
-    );
-    blockquote = [];
-  }
-
-  function flushAll(): void {
-    flushParagraph();
-    flushList();
-    flushBlockquote();
-  }
-
-  for (const rawLine of lines) {
-    const line = rawLine.trimEnd();
-    if (!line.trim()) {
-      flushAll();
-      continue;
-    }
-
-    const heading = line.match(/^(#{1,4})\s+(.+)$/);
-    if (heading) {
-      flushAll();
-      const level = heading[1].length;
-      html.push(`<h${level}>${renderInline(heading[2])}</h${level}>`);
-      continue;
-    }
-
-    const listItem = line.match(/^\s*[-*]\s+(.+)$/);
-    if (listItem) {
-      flushParagraph();
-      flushBlockquote();
-      list.push(listItem[1]);
-      continue;
-    }
-
-    const quote = line.match(/^>\s?(.*)$/);
-    if (quote) {
-      flushParagraph();
-      flushList();
-      blockquote.push(quote[1]);
-      continue;
-    }
-
-    flushList();
-    flushBlockquote();
-    paragraph.push(line);
-  }
-  flushAll();
-  return html.join("\n");
-}
-
-function renderInline(value: string): string {
-  let escaped = escapeHtml(value);
-  escaped = escaped.replace(/`([^`]+)`/g, "<code>$1</code>");
-  escaped = escaped.replace(/\*\*([^*]+)\*\*/g, "<strong>$1</strong>");
-  escaped = escaped.replace(/\b(https?:\/\/[^\s<]+[^\s<.,;:)])/g, (url) => {
-    const safe = escapeAttribute(url);
-    return `<a href="${safe}" rel="noreferrer" target="_blank">${url}</a>`;
-  });
-  return escaped;
-}
-
-async function highlightCode(code: string, lang: string): Promise<string> {
-  try {
-    return await codeToHtml(code, {
-      lang: lang || "text",
-      theme: SHIKI_THEME,
-    });
-  } catch {
-    return `<pre class="shiki fallback"><code>${escapeHtml(code)}</code></pre>`;
-  }
-}
-
-function normalizeLanguage(value: string | undefined): string {
-  const raw = value?.trim().split(/\s+/, 1)[0] ?? "";
-  if (!raw) {
-    return "text";
-  }
-  switch (raw) {
-    case "sh":
-    case "shell":
-    case "zsh":
-      return "bash";
-    case "ts":
-      return "typescript";
-    case "js":
-      return "javascript";
-    default:
-      return raw;
-  }
-}
-
-function escapeHtml(value: string): string {
-  return value.replace(/[&<>"]/g, (char) => {
-    switch (char) {
-      case "&":
-        return "&amp;";
-      case "<":
-        return "&lt;";
-      case ">":
-        return "&gt;";
-      case '"':
-        return "&quot;";
-      default:
-        return char;
-    }
-  });
-}
-
-function escapeAttribute(value: string): string {
-  return escapeHtml(value).replace(/'/g, "&#39;");
-}
diff --git a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
index ac6369ab8..250cb7c22 100644
--- a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
+++ b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
@@ -446,7 +446,9 @@ Deno.test("Worker Console renders markdown only for message rows", async () => {
       consoleLine.includes("font-size: 12px;") &&
       consoleLine.includes("line-height: 1.1;") &&
       consoleLine.includes("{:else if shouldRenderMarkdown(item)}") &&
-      consoleLine.includes("<RichMarkdown text={item.body || '—'} />") &&
+      consoleLine.includes(
+        "<RichMarkdown text={item.body || '—'} streamId={item.id} />",
+      ) &&
       !consoleLine.includes("{@html"),
     "Console should keep markdown rendering to message bodies, safely project Bash ANSI, and render other tool text literally",
   );
diff --git a/web/workspace/vite.config.ts b/web/workspace/vite.config.ts
index 1f6954b62..21556da02 100644
--- a/web/workspace/vite.config.ts
+++ b/web/workspace/vite.config.ts
@@ -1,9 +1,10 @@
+import { svelteTesting } from "@testing-library/svelte/vite";
 import { sveltekit } from "@sveltejs/kit/vite";
 import { defineConfig } from "vite";
 import { CODEMIRROR_VITE_DEDUPE } from "./src/lib/workspace/config-source/vite-dedupe";
 
 export default defineConfig({
-  plugins: [sveltekit()],
+  plugins: [sveltekit(), svelteTesting()],
 
   resolve: {
     dedupe: CODEMIRROR_VITE_DEDUPE,
diff --git a/web/workspace/vitest.config.ts b/web/workspace/vitest.config.ts
new file mode 100644
index 000000000..76639b34a
--- /dev/null
+++ b/web/workspace/vitest.config.ts
@@ -0,0 +1,11 @@
+import { defineConfig, mergeConfig } from "vitest/config";
+import viteConfig from "./vite.config.ts";
+
+export default mergeConfig(
+  viteConfig,
+  defineConfig({
+    test: {
+      include: ["src/**/*.browser.spec.ts"],
+    },
+  }),
+);