fix(admin): make all taxonomy tag matches reachable

[khoinguyenpham04]

What does this PR do?

Replaces the custom five-result taxonomy tag input with a Kumo multi-select combobox.

• Shows every matching tag in a scrollable list capped at about five and a half rows.
• Promotes exact matches so an existing tag such as Security is immediately selectable.
• Supports pointer and keyboard selection with accessible removable chips.
• Preserves failed creation input and API errors, immediately shows created tags, and serializes replacement saves so rapid changes land in order.

Closes #2477

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/...

Discussion: N/A — this is a bug fix.

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: OpenAI Codex (GPT-5)

Screenshots / test output

• Taxonomy sidebar Chromium suite: 12 tests passed.
• Full type-aware lint passed.
• Package-wide typecheck passed.
• Admin production build passed.
• Manual Chromium verification confirmed exact-match ordering, keyboard and pointer selection, removable chips, RTL direction, and a live scroll container measuring 224px content within a 176px viewport.

[changeset-bot]

🦋 Changeset detected

Latest commit: 48981c7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@emdash-cms/admin	Patch
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/plugin-mcp-smoke	Patch
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-demo-site	Patch
@emdash-cms/do-demo-site	Patch
@emdash-cms/do-solo-demo-site	Patch
@emdash-cms/auth	Patch
@emdash-cms/blocks	Patch
@emdash-cms/gutenberg-to-portable-text	Patch
@emdash-cms/x402	Patch
create-emdash	Patch
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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[emdashbot]

This PR addresses #2477 by replacing the hard-coded five-suggestion tag picker with a Kumo Combobox multi-select. The approach is sound: it keeps locale scoping via withLocale, performs client-side filtering with the existing diacritic-aware termMatches/termExactMatches, promotes exact matches to the top of the list, serializes rapid saves with a useMutation scope, and preserves creation input/API errors. The test additions are behavior-oriented and cover reachability, exact-match ordering, pointer/keyboard selection, rapid-save serialization, error recovery, and optimistic creation.

I read the diff, the full changed component/test files, and checked against AGENTS.md (localization, RTL-safe Tailwind, Kumo usage, changeset, comment discipline, query-count policy). The implementation looks correct and the changeset is user-facing. The only issues are two comments that restate what the surrounding code already plainly does, violating the AGENTS comment discipline.

[github-actions]

Scope check

This PR changes 550 lines across 3 files. Large PRs are harder to review and more likely to be closed without review.

If this scope is intentional, no action needed. A maintainer will review it. If not, please consider splitting this into smaller PRs.

See CONTRIBUTING.md for contribution guidelines.

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commit: 48981c7

[ascorbic]

I'm guessing you didn't notice #2491!

[khoinguyenpham04]

I'm guessing you didn't notice #2491!

I did this yesterday! But didn't push until today LOL