Add preview annotations to desks UI

[youknowriad]

Summary

• Add the preview annotation flow to desks UI with zoom-in annotate mode, element picking, comment entry, and temporary note connectors
• Reuse the shared annotation prompt format across desks and classic UI so submitted notes arrive in chat consistently
• Update the site preview surface for Electron/webview annotation injection and align the widget controls with the reference flow
• Render annotation-styled notes with preview metadata and a dedicated annotate toolbar for submit, cancel, and removal actions

Testing

• Lint and formatting passed on the modified files
• Type checking passed
• Focused unit tests passed for the desks selection toolbar, connector utils, and classic annotation formatting

[wpmobilebot]

📊 Performance Test Results

Comparing cbf575c vs trunk

app-size

Metric	trunk	cbf575c	Diff	Change
App Size (Mac)	1409.62 MB	1409.62 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	cbf575c	Diff	Change
load	1489 ms	1488 ms	1 ms	⚪ 0.0%

site-startup

Metric	trunk	cbf575c	Diff	Change
siteCreation	8610 ms	8575 ms	35 ms	⚪ 0.0%
siteStartup	4927 ms	4927 ms	0 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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