feat: add recent activity refresh button

[arnestrickmann]

Summary

• add a compact refresh control beside Recent activity on connection pages
• disable and animate the control while route data reloads
• keep the button outside the heading for clean screen-reader navigation
• let section headings host adjacent actions and icon buttons opt into the extra-small size

Test Coverage

• Browser QA verified the seeded Granola connection page, tooltip, heading semantics, existing Go to all activity link, and a completed refresh click.
• Repository tests: 361 passed, 0 failed.

Pre-Landing Review

No blocking issues found. An accessibility finding from the adversarial review was fixed before commit.

Design Review

Design Review (lite): no issues found. The final layout was verified at 1440 × 1000.

Eval Results

No prompt-related files changed, so evals were skipped.

Plan Completion

No relevant plan file was detected.

Verification Results

• bun run test
• bun run typecheck
• bun run lint (one existing fast-refresh warning)
• bun run build
• browser click and accessibility-tree verification

Test plan

• Refresh control appears beside Recent activity
• Tooltip labels the control
• Clicking refresh completes and re-enables the control
• Existing activity link remains inline
• Refresh control is separate from the heading in the accessibility tree