Agentic UI: Add multi-note annotation sessions

[shaunandrews]

Related issues

• Related to STU-2183

How AI was used in this PR

Codex extracted this focused change from the larger annotation workflow exploration. The interaction model was directed and reviewed manually.

Proposed Changes

• Keeps annotation mode active after saving so users can add several notes on the current page.
• Separates saving a note from sending the full batch to chat.
• Replaces the active Annotate control with clear Cancel and Send to chat actions.
• Uses Return to save a note and Cmd/Ctrl+Return to insert a newline.
• Ends annotation mode after a page load instead of trapping the user in selection mode.

⚠️ Visual change: needs human review in light + dark mode.

Testing Instructions

1. Open a running site and enter annotation mode.
2. Save multiple notes on the current page and confirm annotation mode remains active.
3. Confirm Return saves and Cmd/Ctrl+Return inserts a newline.
4. Confirm Cancel clears the batch and Send to chat submits it.
5. Run:
   • npm run typecheck
   • npm test -- apps/ui/src/components/site-preview/inspector-script.test.ts apps/ui/src/components/site-preview/index.test.tsx

Pre-merge Checklist

• Focused tests pass
• Typecheck passes
• Human visual review in light and dark mode
• Full CI passes

[wpmobilebot]

📊 Performance Test Results

Comparing 69184e7 vs trunk

app-size

Metric	trunk	69184e7	Diff	Change
App Size (Mac)	1406.69 MB	1406.63 MB	0.06 MB	⚪ 0.0%

site-editor

Metric	trunk	69184e7	Diff	Change
load	1021 ms	1035 ms	+14 ms	⚪ 0.0%

site-startup

Metric	trunk	69184e7	Diff	Change
siteCreation	7572 ms	7540 ms	32 ms	⚪ 0.0%
siteStartup	2860 ms	2873 ms	+13 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[bcotrim]

I pushed some changes to adjust the layout for smaller screens.

@shaunandrews can you give a look, please?
Going to merge in order to have this available for the release