feat(app): show notice when base images have already been updated

[danadajian]

Summary

• Adds a new tRPC query getVisualRegressionStatus that checks the GitHub commit status for the visual regression context
• When the status is already success (base images were accepted in a prior session or by another reviewer), a green banner is shown above the Accept button
• The query is only made when commitHash, owner, and repo are all present in the URL — diffId-only flows are unaffected
• Fixes a bug where the new test count could go negative per package when orphaned diff.png files (no corresponding new.png) were present

Changes

• app/backend/src/getVisualRegressionStatus.ts (new) — fetches listCommitStatusesForRef via octokit, returns { isAlreadyUpdated: boolean }
• app/backend/src/schema.ts — adds getVisualRegressionStatusInputSchema
• app/backend/src/router.ts — registers getVisualRegressionStatus query
• app/frontend/components/main-page.tsx — calls the new query and renders a green banner when isAlreadyUpdated is true
• action/src/run.ts — tracks valid (non-orphaned) diff paths separately and uses them for per-package newTestCount calculation

Test plan

• Navigate to a Comparadise URL with a commitHash whose visual regression status is already success → green banner "Base images have already been updated for these diffs." appears above the Accept button
• Navigate to a URL with a commitHash still in pending state → no banner shown
• Navigate to a URL with only diffId (no commitHash) → no banner shown, query is not fired
• Accept visual changes for a pending hash → after acceptance the banner should appear on next load
• Run with a package that has an orphaned diff.png → newTestCount for that package is 0 or positive, never negative

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[eg-oss-ci]

🎉 This PR is included in version 1.42.0 🎉

The release is available on GitHub release

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