Fix(admin): Localize MediaPickerModal

[pitscher]

What does this PR do?

This PR is a follow-up on: #1244

It wraps the MediaPickerModal built-in Library provider label with Lingui so they follow the selected admin locale.
For now, the MediaPickerModal is fully covered for translations. Translators can pickup the changes of their messages.po to finish this story.

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: Codex with GPT 5.5

Screenshots / test output

[changeset-bot]

🦋 Changeset detected

Latest commit: 4ba0e2c

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

This PR includes changesets to release 14 packages

Name	Type
@emdash-cms/admin	Patch
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-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

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

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commit: 4ba0e2c

[emdashbot]

This PR correctly localizes the two remaining hardcoded "Library" strings in MediaPickerModal.tsx by wrapping them with Lingui's t`Library` macro. The approach is sound: it's a focused follow-up that brings MediaPickerModal in line with the already-localized MediaLibrary component (which uses the identical pattern for its built-in provider label).

I verified:

• Both changed useMemo dependency arrays were properly updated to include t, so locale changes invalidate the memoized labels.
• No other untranslated user-facing strings remain in MediaPickerModal.tsx.
• The changeset follows the required format and accurately describes the user-facing fix.
• The diff is minimal and scoped exactly to the stated purpose.

No issues found — clean localization fix.