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/commit-diff-panel.tsx

@@ -132,6 +132,7 @@ function useCommitDiffPanelDescriptor(
   return {
     label: target.sha.slice(0, 7),
     subtitle: t("panels.diff.commitSubtitle"),
+    tooltip: target.sha,
     titleState: "ready",
     icon: ThemedGitCommitHorizontal,
     statusBucket: null,