[FEATURE]: TUI: click the file name on Edit/Write/ApplyPatch blocks to open it in the editor

Feature hasn't been suggested before.

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Describe the enhancement you want to request

When the agent edits a file, the TUI renders ← Edit <file> with the patch below it. Today that title is plain text. I'd like the file name to be clickable so it opens in my editor, with the diff/patch available there — so I can jump straight from the transcript to the changed code without copy-pasting paths.

Current behavior

The Edit/Write/ApplyPatch titles are rendered by BlockTool in packages/tui/src/routes/session/index.tsx with no click handler:

• Edit: :2409 — ← Edit <path>
• Write: :2115 — # Wrote <path>
• ApplyPatch: :2484 — ← Patched <relativePath> / # Created / # Moved / # Deleted

BlockTool already supports onClick, hover highlight, and onMouseUp (:1994-2044); only the Shell tool uses onClick today (:2081). openEditor in packages/tui/src/editor.ts:26 only opens a temporary markdown transcript (used by /export), not an arbitrary workspace file.

Proposed behavior

• Clicking the file name (ideally just the file name, not the whole block) opens that file in $VISUAL/$EDITOR, falling back to the OS default application.
• Keep existing block click behavior intact (e.g. Shell expand/collapse).
• Delete files stay non-clickable; Moved opens the destination path.
• If no editor is available or opening fails, show a toast instead of doing nothing silently.

Implementation sketch

• Add an openFile(path, opts) helper in packages/tui/src/editor.ts that spawns the editor directly on the real workspace file, mirroring the existing openEditor suspend/restore lifecycle, with a platform-default fallback.
• Add an optional onTitleClick / render-prop to BlockTool and wire it in Edit, Write, and ApplyPatch.
• Update packages/tui/test/util/tool-display.test.ts / renderer.test.ts and add editor tests for VISUAL precedence and path resolution.

Related

• Prior PR #30404 "feat(tui): make file tool titles clickable" — same scope, auto-closed by the stale-cleanup bot, not rejected on technical grounds.
• #19005 — Make local file paths clickable in terminal output.
• #37891 — Desktop: make file paths in chat clickable (open in editor / reveal in Finder).
• #45001, #44442 — TUI hyperlink / OSC 8 handling.