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/file-panel.tsx

@@ -1,11 +1,12 @@
 import { Text, View } from "react-native";
-import { FileText } from "lucide-react-native";
+import { useMemo } from "react";
 import invariant from "tiny-invariant";
 import { useTranslation } from "react-i18next";
-import { FilePane } from "@/components/file-pane";
+import { FilePane } from "@/file-pane/pane";
 import { usePaneContext } from "@/panels/pane-context";
 import type { PanelRegistration } from "@/panels/panel-registry";
 import { useWorkspaceDirectory } from "@/stores/session-store-hooks";
+import { createMaterialFileIcon } from "@/components/material-file-icon";
 
 const CENTERED_PADDED_STYLE = {
   flex: 1,
@@ -16,11 +17,13 @@ const CENTERED_PADDED_STYLE = {
 
 function useFilePanelDescriptor(target: { kind: "file"; path: string }) {
   const fileName = target.path.split("/").findLast(Boolean) ?? target.path;
+  const icon = useMemo(() => createMaterialFileIcon(fileName), [fileName]);
   return {
     label: fileName,
     subtitle: target.path,
+    tooltip: target.path,
     titleState: "ready" as const,
-    icon: FileText,
+    icon,
     statusBucket: null,
   };
 }