Fix SeoPanel pending draft flush

[richardjoo]

What does this PR do?

Fixes SeoPanel so pending debounced SEO text edits are still emitted when the panel unmounts or content switches before the debounce timer fires.

Closes #

Type of change

• Bug fix
• Feature (requires maintainer-approved Discussion)
• Refactor (no behavior change)
• Translation
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation (if applicable). Do not include messages.po changes except in translation PRs — a workflow extracts catalogs on merge to main.
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: GPT-5.4 / OpenCode

Screenshots / test output

• pnpm --filter @emdash-cms/admin test
• pnpm format:check

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Latest commit: fc54692

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[Copilot]

Pull request overview

Fixes SeoPanel so any pending debounced SEO text edits are flushed (emitted via onChange) when the panel unmounts or when the editor switches to a different contentKey before the debounce timer fires.

Changes:

• Update flushPendingDraft() to cancel any pending timer and avoid emitting when the current draft matches the last emitted snapshot.
• Strengthen the unmount-flush test to assert the flushed value is the final emitted call and that no later debounce emits occur.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/admin/src/components/SeoPanel.tsx	Ensures pending debounced draft updates are flushed safely on unmount/content switch without redundant emits.
packages/admin/tests/components/SeoPanel.test.tsx	Verifies pending debounced edits are flushed on unmount and no additional emits happen after the debounce window.

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commit: fc54692

[richardjoo]

I checked the red CI item on this PR.
It isn't one of the test suites, and it doesn't appear to be caused by the SeoPanel change.

What's failing is the Query Counts workflow (Measure job), specifically the Regenerate snapshots step.

All of the actual test/quality jobs are green on this PR: Tests, Browser Tests, Integration Tests, E2E, Lint, Typecheck, and Format.

I also reproduced the harness separately, and the failure is in the perf/query-count path, not the admin test path.
On my side, the sqlite query-count run completed, while the d1 query-count run died in the fresh-isolate loop with TypeError: fetch failed.

This branch is also behind the current main, so my guess is that this is a stale-branch / query-count harness issue rather than something introduced by the SeoPanel fix itself. I can rebase/sync and rerun if you want, but I don't think this red check indicates a regression in the code changed here.