fix: fence disabled Composer mutations

web/workspace/src/lib/workspace/console/ComposerInput.svelte

@@ -280,6 +280,18 @@
         extensions: [
           history(),
           Prec.highest(keymap.of([
+            {
+              key: "Mod-z",
+              run: (currentView) => currentView.state.readOnly,
+            },
+            {
+              key: "Mod-Shift-z",
+              run: (currentView) => currentView.state.readOnly,
+            },
+            {
+              key: "Mod-y",
+              run: (currentView) => currentView.state.readOnly,
+            },
             {
               key: "Backspace",
               run: (currentView) =>
@@ -397,7 +409,7 @@
   }
 
   export function replaceRange(from: number, to: number, content: string): void {
-    if (!view) return;
+    if (!view || view.state.readOnly) return;
     view.dispatch({
       changes: { from, to, insert: content },
       selection: EditorSelection.cursor(from + content.length),

web/workspace/src/lib/workspace/console/worker-console.ui.test.ts

@@ -608,7 +608,11 @@ Deno.test("Worker Console paste chips preserve typed draft and target authority"
         "composerDeletionRange(selection, pastes, direction)",
       ) &&
       composerInput.includes("EditorState.readOnly.of(isDisabled)") &&
+      composerInput.includes('key: "Mod-z"') &&
+      composerInput.includes("if (!view || view.state.readOnly) return") &&
       composerInput.includes("if (currentView.state.readOnly) return false") &&
+      consolePage.includes("activeComposerTargetKey !== targetKey") &&
+      consolePage.includes("if (!composerEditable) return") &&
       composerInput.includes('chip.setAttribute("aria-label", label)') &&
       composerInput.includes("preserveExactText = false") &&
       consolePage.includes("buildComposerSegmentsRequest(value.segments, {") &&

web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workers/[workerId]/console/+page.svelte

@@ -353,10 +353,13 @@
     }
 
     async function applyComposerCompletion() {
-        if (!composerInputElement) return;
+        if (!composerEditable || !composerInputElement) return;
+        const input = composerInputElement;
+        const targetKey = activeComposerTargetKey;
+        const document = draft.document;
         const token = completionTokenAt(
-            draft.document,
-            composerInputElement.cursor(),
+            document,
+            input.cursor(),
         );
         completionToken = token;
         completionError = null;
@@ -368,12 +371,20 @@
         completionBusy = true;
         try {
             const entries = await resolveCompletionEntries(token);
+            if (
+                !composerEditable ||
+                composerInputElement !== input ||
+                activeComposerTargetKey !== targetKey ||
+                draft.document !== document
+            ) {
+                return;
+            }
             completionEntries = entries;
             if (entries.length === 0) {
                 completionError = `No completions for ${token.sigil}${token.prefix}`;
                 return;
             }
-            composerInputElement.replaceRange(
+            input.replaceRange(
                 token.start,
                 token.end,
                 `${entries[0].value} `,
@@ -433,6 +444,7 @@
             return;
         }
         event.preventDefault();
+        if (!composerEditable) return;
         void applyComposerCompletion();
     }