apps/ui: Fix AI session site placement and restore active run state across navigation

[youknowriad]

Summary

• Treat CLI-only sessions as generic chats in the UI and move site placement into desktop-only metadata.
• Bind app-created site chats to the created site and automatically navigate the desk when a session moves to a different site.
• Recover active agent runs from the main process so the thinking indicator and live run state survive session switches and remounts.
• Update the AI prompt and create-site flow so ambiguous site requests ask for intent before creating a new site.

Testing

• Added and updated unit tests for session summary hydration, environment flips, site placement storage, and site_create artifacts.
• Validated the shared run-state refactor with focused UI and CLI test coverage.
• npx eslint --fix and npm run typecheck passed.

[wpmobilebot]

📊 Performance Test Results

Comparing cd2e20f vs trunk

app-size

Metric	trunk	cd2e20f	Diff	Change
App Size (Mac)	1409.60 MB	1409.48 MB	0.12 MB	⚪ 0.0%

site-editor

Metric	trunk	cd2e20f	Diff	Change
load	1522 ms	1503 ms	19 ms	⚪ 0.0%

site-startup

Metric	trunk	cd2e20f	Diff	Change
siteCreation	8566 ms	8598 ms	+32 ms	⚪ 0.0%
siteStartup	4929 ms	4933 ms	+4 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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