Expand About bio with longer-form narrative (#11)

[schmug]

Summary

• Moves About copy (bio, tagline, current-focus items, social links) into a single typed module at src/data/about.ts so the static /about page and the in-OS AboutApp render from one source.
• Expands the bio to four paragraphs (dry builder-log voice) covering the studio-of-one framing, Cloudflare-native rationale, and CortechOS-as-metaphor note — the themes called out in Expand About bio with longer-form narrative #11.
• Drops the stale "this page is about to turn into CortechOS" transitional paragraph from /about.

Closes #11.

Test plan

• npm run typecheck — 0 errors, 0 warnings.
• npm test on new suite — src/data/about.test.ts 4/4 (bio ≥ 4 non-empty paragraphs, current-focus fields populated, every social link https://).
• npm run test:e2e — 4/4 (existing desktop golden path + new /about static page spec asserting a bio[0] prefix; About window spec also asserts the same prefix via the shared module).
• Mobile-review the prose and the current-focus ordering.
• Visual check /about and the in-OS AboutApp side-by-side for layout parity after the brand-mark merge.

Notes for reviewer

• E2E flake flagged: desktop golden path fails on a cold Vite dev server with 504 Outdated Optimize Dep noise (the test asserts zero console errors). Passes cleanly once the dev server is warm (e.g., one curl to /). Pre-existing, not regressed by this PR, but worth watching in CI.
• Separate follow-up: npm test run at the repo root collects ~64 test files from .worktrees/brand-mark/node_modules/** because vitest.config.ts excludes node_modules/** (top-level) rather than **/node_modules/** / .worktrees/**. One-line fix, deliberately out of scope here.

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