fix(dashboard): include every field in link update previews

[izadoesdev]

Link-update previews omitted expired redirects and social-preview fields, and compared expiration timestamps as dates. Those updates could display "No changes detected" before applying a mutation. Build the update payload once and reuse it for the preview, mutation, and success receipt, preserving full timestamps, null clears, and resolved folder IDs. Empty updates do not write or request confirmation.

This fixes the native link tools used by Slack and dashboard agents. The external MCP server's separate wrapper already returns its proposed payload. The existing conversational confirmation contract remains unchanged; this does not bind approval to a stored payload.

Validation: 39 focused link/catalog/MCP/query tests, 974 AI tests, 95 Slack tests, root lint, all 33 typecheck tasks, and all 29 pre-push test tasks passed. Regression coverage checks exact mutation inputs, all supported update fields, same-day expiration changes, null clears, empty updates, and rejection of invalid folders or incompatible deep links. The AI suite skips 33 integration tests requiring external services. Independently reviewed.

Independent of #818 and #820, which touch separate files. No migrations, new dependencies, environment variables, or user setup. Maintainer-directed, AI-assisted implementation and review.

[vercel]

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Project	Deployment	Actions	Updated
databuddy-status	Ready	Preview	Sep 18, 2026 8:25am UTC

2 Skipped Deployments

Project	Deployment	Actions	Updated
dashboard	Skipped		Sep 18, 2026 8:25am UTC
documentation	Skipped		Sep 18, 2026 8:25am UTC

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Name	Status	Preview	Inspect	Updated (UTC)
links (preview)	Ready	Visit Preview	Inspect	Sep 18, 2026 8:25am

[greptile-apps]

Confidence Score: 4/5

The production change appears behaviorally sound, but the explicit repository prohibition against adding mock data must be satisfied before merging.

Findings

1.  Mock data violates rules ▶

Summary

The PR makes link-update previews, mutations, and success receipts share the same normalized update payload.

• Includes every supported update field, exact timestamps, explicit null clears, and resolved folder IDs in previews.
• Avoids confirmation requests and mutations when no updates are supplied.
• Adds parameterized regression coverage for previews, mutations, empty updates, invalid folders, and incompatible deep links.
• The previous namespace-import and awaited-loop findings are fixed in the current test code.

_{Reviews (2) · Last reviewed commit: "test(dashboard): isolate link update pre..."}