Edit workspace files directly on web (#2270)

* feat(files): edit workspace files on web

Keep source buffers synchronized with host file changes and require an explicit overwrite or reload when revisions diverge.

* feat(panels): surface and protect modified tabs

Expose tooltip and modification state through the generic panel boundary so tabs can show stable metadata and guard every close route consistently.

* fix(tests): use portable fake timeout handle

* fix(files): harden editor conflict handling

Preserve modified panel state across tab eviction, use precise revisions for optimistic writes, coalesce concurrent file watchers, and localize the editor interface.

* fix(files): close editor concurrency gaps

Coalesce clean reloads, preserve subscriber identities and file permissions, suspend pending saves during close confirmation, and carry precise revisions through file reads.

* test(files): expect read revision metadata

packages/app/src/hooks/use-settings/storage.ts

@@ -43,6 +43,7 @@ export interface AppSettings {
   workspaceTitleSource: WorkspaceTitleSource;
   autoExpandReasoning: boolean;
   toolCallDetailLevel: ToolCallDetailLevel;
+  vimKeybindings: boolean;
 }
 
 export interface Settings extends AppSettings {
@@ -66,6 +67,7 @@ export const DEFAULT_CLIENT_SETTINGS: AppSettings = {
   workspaceTitleSource: "title",
   autoExpandReasoning: false,
   toolCallDetailLevel: "detailed",
+  vimKeybindings: false,
 };
 
 export const DEFAULT_APP_SETTINGS: Settings = {
@@ -233,6 +235,9 @@ function pickAppSettings(stored: StoredAppSettings): Partial<AppSettings> {
   if (typeof stored.syntaxTheme === "string" && isSyntaxThemeId(stored.syntaxTheme)) {
     result.syntaxTheme = stored.syntaxTheme;
   }
+  if (typeof stored.vimKeybindings === "boolean") {
+    result.vimKeybindings = stored.vimKeybindings;
+  }
   if (
     typeof stored.workspaceTitleSource === "string" &&
     VALID_WORKSPACE_TITLE_SOURCES.has(stored.workspaceTitleSource)