fix(gmail): open search results in the indexed mailbox

[waleedlatif1]

Summary

• Open Gmail search results in the indexed mailbox, including when that account is not signed in to the browser.
• Resolve mailbox identity from Gmail credentials and reuse it within each sync. Keep history cursors fresh and preserve document content, hashes, and access controls.
• Exclude repair scripts and database backfills; existing stored links are unchanged.

Type of Change

• Bug fix

Testing

• 190 connector, Google Workspace, and citation tests passed.
• 7 PostgreSQL ingestion and access-control integration tests passed with provider fixtures.
• Verified live browser navigation for a signed-in secondary mailbox and an account not signed in.
• App type-check, repository lint, all 46 audits (including strict API validation), block registry, and docs manifest checks passed.

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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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 17, 2026 2:17am UTC

[cubic-dev-ai]

No issues found across 7 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no new actionable issues and the earlier historical-link limitation explicitly accepted and manually resolved.

Summary

This PR makes Gmail knowledge-search results open in the mailbox that was indexed rather than defaulting to browser account zero.

• Resolves and validates the authenticated mailbox email from the Gmail profile.
• Reuses mailbox identity within a sync while keeping history watermarks fresh.
• Builds account-chooser URLs that target the correct mailbox and archived thread.
• Adds unit, connector, citation, and PostgreSQL integration coverage.
• Deliberately leaves unchanged historical stored links for a separate repair or metadata-reconciliation effort.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Gmail credential] --> B[Read Gmail profile]
  B --> C[Validate mailbox email and history ID]
  C --> D[Cache mailbox identity for current sync]
  D --> E[Create thread document stub]
  E --> F[Build Google AccountChooser URL]
  F --> G[Open indexed mailbox]
  G --> H[Open Gmail thread under all mail]

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[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

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[cubic-dev-ai]

No issues found across 7 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}