feat: user and drive integration settings pages (#619-620)

[2witstudios]

Summary

• Enhanced user integrations settings page with account metadata display, last used timestamps, and affected agent count warnings on disconnect ([UI] Task 31: User integrations settings page #619)
• Enhanced drive integrations admin panel with per-connection agent grant count badges and disconnect warnings ([UI] Task 32: Drive integrations admin page #620)
• Created connection grants API endpoint for fetching agent usage data
• Added 13 component tests for DisconnectConfirmDialog and IntegrationStatusBadge

Test plan

• Settings pages render with existing patterns
• Account metadata (email, name, workspace) displayed on connected integrations
• Last used time shown with relative formatting
• Agent count badge shown per drive connection
• Disconnect dialog shows affected agent warning
• OAuth flow initiates via existing ConnectIntegrationDialog
• 13 new tests pass, 245/247 test files pass (2 pre-existing DB failures)

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📥 Commits

Reviewing files that changed from the base of the PR and between afb36e6 and b6aecbb.

📒 Files selected for processing (7)

• apps/web/src/app/api/integrations/connections/[connectionId]/grants/route.ts
• apps/web/src/app/settings/integrations/page.tsx
• apps/web/src/components/integrations/DisconnectConfirmDialog.tsx
• apps/web/src/components/integrations/__tests__/DisconnectConfirmDialog.test.tsx
• apps/web/src/components/integrations/__tests__/IntegrationStatusBadge.test.tsx
• apps/web/src/components/settings/DriveIntegrations.tsx
• apps/web/src/hooks/useIntegrations.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/sandbox-ui-settings

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