Move the last React-free modules out of apps/web

[playforge-coding]

Stacked on #25. Phase 1C — the six modules that never needed React but were sitting in the app.

richText (the DOMPurify render pass), wikimedia (the browser Commons client), presence, summarizer, git/fs and git/sync. All land in the browser tier: DOMPurify, DOMParser, the Summarizer API and LightningFS-over-IndexedDB are browser things — framework-agnostic, but not runtime-neutral.

Two renames, deliberately

Both would otherwise have been a second module with the same basename in a different tier — the thing I avoided with image/imageFile in the browser-tier PR:

From	To	Because
richText.js	browser/sanitizeRichText	../richText.js holds the policy
wikimedia.js	browser/commonsImages	../wikimedia.js holds the plumbing

Dropping an indirection

sanitizeRichText carried a re-export block so components could get all their rich-text helpers from one import. With the module in core that buys nothing — so the five consumers that only wanted the neutral helpers (richTextLength, richTextToLine, isRichTextEmpty, isRichTextHtml) now take them from core/richText directly, and only RichText.jsx — which actually sanitizes — imports the browser module.

The bundle split, re-checked

git/fs and git/sync crossing into a workspace package could plausibly have broken the lazy git chunk, so I verified rather than assumed: isomorphic-git internals still appear only in the ~181 KB async chunk and in none of the four main ones.

Phase 1 is now done

apps/web/src/lib is 1,892 lines; packages/core is 7,504 (+635 tests).

What's left in the app, and why it should stay:

File	Why
i18n.js, languages.js	bound to react-i18next
git/engine.js, git/load.js	the dynamic-import boundary and the Buffer polyfill — bundler concerns
utils.js	cn(), the shadcn/Tailwind helper
everything else	React hooks and contexts

That is the state the SvelteKit plan assumed: the rewrite surface is the view layer, not the product.

Verification

pnpm lint, pnpm test (core 41, api 27, mcp 14), pnpm build, pnpm build:docs all pass.

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