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/panels/browser-panel.tsx

@@ -42,10 +42,12 @@ function useBrowserPanelDescriptor(target: {
   const browser = useBrowserStore((state) => state.browsersById[target.browserId] ?? null);
   const url = browser?.url ?? "https://example.com";
   const icon = createBrowserTabIcon(browser?.faviconUrl ?? null);
+  const label = getBrowserLabel({ title: browser?.title ?? "", url });
 
   return {
-    label: getBrowserLabel({ title: browser?.title ?? "", url }),
+    label,
     subtitle: url,
+    tooltip: url || label,
     titleState: "ready",
     icon,
     statusBucket: browser?.isLoading ? "running" : null,