feat(magic-rewrite): V1 — AI-assisted text rewriting for editors

[kevin-ho]

Linked issue

Closes #1183

Why this change

Writing and maintaining long-form text entries — character descriptions, persona definitions, lorebook entries — is tedious. Other RP platforms offer AI-assisted rewriting with natural language instructions ("add more detail about their childhood," "convert to XML format," "make this more token-efficient"). Currently Marinara has no built-in mechanism for this. A third-party extension exists as a proof of concept but requires users to manually enter API keys. This PR ships the feature natively, reusing Marinara's existing connection infrastructure.

What changed

• packages/server/src/routes/magic-rewrite.routes.ts (new): POST /api/magic-rewrite/generate — accepts text and instruction, resolves an LLM connection through the existing default → default agent fallback chain, returns rewritten text. No new DB columns, no migrations.
• packages/client/src/components/ui/MagicRewritePanel.tsx (new): Instruction textarea, generate button, word-level LCS diff view (green additions, red deletions). Falls back to plain text for inputs over 3 000 words. Includes HelpTooltip noting agent connection usage.
• packages/client/src/components/ui/ExpandedTextarea.tsx (modified): Rewrite button in fullscreen editor header, Apply/Back controls. Escape key suppressed during rewrite mode.
• packages/client/src/components/lorebooks/LorebookFormFields.tsx (modified): Same rewrite integration in lorebook expanded content modal. Modal widened to max-w-5xl.
• packages/server/src/routes/index.ts (modified): Registered magic-rewrite routes under /api/magic-rewrite.

Intentionally omitted (follow-up PRs)

Per maintainer feedback on #1184, V1 is scoped to the core rewrite flow:

• Rewrite-specific default connection selection (defaultForRewrite flag)
• DB migration / schema changes
• Connection editor toggle UI
• Character card / lorebook context injection
• Chat history context selection

Validation

• pnpm check passes locally
• Container (Docker / Podman) built and ran without issue
• Ran the app, clicked through the changes manually
• Checked edge cases (light + dark mode, mobile viewport, empty states, error paths)
• Above manual verification completed (describe below)
• Read and followed CONTRIBUTING.md

Manual verification notes

Docs and release impact

• No docs changes needed
• Updated docs (README / CONTRIBUTING / android/README / CHANGELOG) as needed
• Version/release files updated (only if this PR includes a version bump)

UI evidence (if applicable)

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[cha1latte]

v1 ported in #1260 !