fix(search): tighten Google sync and invitation recovery

[waleedlatif1]

Summary

• Keep Gmail full sync and change history consistent for missing labels and rolling date filters.
• Show incomplete Drive picker results accurately and refresh source details after manual sync settles.
• Recover invitation authentication errors with sign-in or account switching while preserving disclosure guards.
• Trim repeated Google setup instructions, clarify service and permission limits, and remove an oversized delegation screenshot with an outdated background grant.

Type of Change

• Bug fix

Testing

• 1,508 targeted connector, selector, permission, and Search tests passed; the separate real PostgreSQL permission test also passed.
• 67 invitation tests and 109 embedding/admission tests passed. Application and documentation type checks passed.
• Full lint, 46 repository audits, block-registry validation, and docs-manifest validation passed. All eight cleanup passes completed.
• Manually verified central Google sync through document processing, embeddings, and stored permissions; verified invitation account-mismatch recovery and current setup screenshots.
• Final signed-in member Search and Assistant verification remains pending authentication. This PR does not claim that final manual step is complete.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 10, 2026 10:31am UTC

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the changed synchronization, selector, and invitation paths are consistent with their existing contracts and have focused regression coverage.

Summary

• Uses one second-precision rolling cutoff for Gmail full listings and history filtering.
• Keeps missing-label behavior consistent while distinguishing absent labels from failed label lookups.
• Reconciles connector detail and list caches after manual sync dispatch.
• Reports incomplete Google Drive searches through selector truncation diagnostics.
• Detects invitation account mismatches using normalized email addresses and offers account switching.
• Consolidates Google connection guidance and removes an outdated delegation screenshot.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Google or invitation operation] --> B{Operation type}
  B -->|Gmail sync| C[Build second-precision cutoff and label scope]
  C --> D[Full listing or history changes]
  D --> E[Consistent indexed document reconciliation]
  B -->|Manual connector sync| F[Optimistically mark pending]
  F --> G[Trigger request settles]
  G --> H[Invalidate source, detail, and successful list queries]
  H --> I[Polling observes pending through completion]
  B -->|Drive picker| J[Request files with incompleteSearch]
  J --> K[Map provider incompleteness to truncation diagnostics]
  B -->|Invitation| L[Load invitation under disclosure guards]
  L --> M{Normalized email matches?}
  M -->|Yes| N[Allow acceptance]
  M -->|No| O[Offer sign-in with a different account]

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