chore: bump version to 1.2.8

[Charlie85270]

Summary

Aligns the published version with the v1.2.8 changelog entry that landed in #54.

• `package.json` → `1.2.8`
• `src/components/Settings/GeneralSection.tsx` → fallback "Version 1.2.8" string when the update-checker hasn't reported yet
• `landing/src/app/api/download/route.ts` → `DOWNLOAD_URL` points at `dorothy-1.2.8-arm64.dmg` on the 1.2.8 GitHub release tag

Merge order suggestion: cut and publish the 1.2.8 GitHub release first, then merge this PR — that way the landing-page download link doesn't 404 between merge and release.

Test plan

• Confirm `grep -n 1\.2\.7 src landing` returns nothing related to the app version (only unrelated dep versions in lockfiles).
• Open the Settings page → General section → see "Version 1.2.8" as the fallback (or whatever the update checker returns once a 1.2.8 release is live).
• Hit the landing's `/api/download` endpoint after the 1.2.8 release is published → confirm 302 redirect to `dorothy-1.2.8-arm64.dmg`.

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Project	Deployment	Actions	Updated (UTC)
dorothy	Ready	Preview, Comment	May 5, 2026 4:38pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d00878e9-59b1-480c-9e04-7af8089f113c

📥 Commits

Reviewing files that changed from the base of the PR and between 60795c0 and 75415b3.

📒 Files selected for processing (3)

• landing/src/app/api/download/route.ts
• package.json
• src/components/Settings/GeneralSection.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-1.2.8

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