feat(ui): loading spinners, paged searchable agent tables; v0.0.9 - #17

Summary

• Loading spinners: the button, menu item or field you just clicked (or pressed Enter in) shows a spinner while its request runs. This is handled in one place, ui.js api(), and covers adding a project, launching an agent, saving and sharing. The spinner waits 150ms before showing, so fast replies don't flicker.
• The terminal pane shows a spinner with "Starting shell…" and "Reconnecting…".
• Search-all and Context search show "Searching…" while they run.
• AI agents page: Hand-offs, Resumable sessions and Devin sessions are now fixed-height tables (380px, column headers stay put). Each has its own search box and shows 25 rows at a time; scrolling near the bottom, or Load more, adds the next 25. The search text, loaded rows, scroll position and search-box focus survive the page's 5s re-render. Hand-offs are no longer cut at the newest 30.
• Release 0.0.9: version bump, uv lock, CHANGELOG.

Testing

• uv run pytest -q: 144 passed, 1 skipped. uv run ruff check: clean.
• Checked in Chromium (Playwright) with the requests slowed down and 60 seeded hand-offs:
  • The Add project button showed its spinner.
  • The pane showed "Starting shell…".
  • The Hand-offs table showed 25 rows, then 50 after scrolling, and 9 after searching "login".
  • The search was still there after the 5s re-render.

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https://claude.ai/code/session_01PobiKTh2wyjWp5KigmW5Fa

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