fix(theme): remove orphaned dark-mode stylesheet + Settings toggle

[Jose-Gael-Cruz-Lopez]

What

Removes dead dark-mode code from the light-mode-only app:

• Deletes the html.dark { … } token block (and html.dark input/select/textarea color-scheme rules) from frontend/src/app/globals.css.
• Removes the "dark" option from the Theme selector in frontend/src/components/screens/Settings.tsx (Theme now offers only "light").

Why

The project is light-mode only, and globals.css itself notes that dark mode "gets its own branch — not squatting in the same stylesheet." Nothing ever applied the .dark class (Settings only sets --accent inline), so the token block was dead CSS and the "dark" Theme option was a latent regression that could one wire away activate an off-spec theme with glowing chrome.

How verified

• npx tsc --noEmit — clean (exit 0).
• npx vitest run — 37 passed (5 files), exit 0.
• Grep confirms no remaining references to html.dark / .dark / color-scheme: dark / prefers-color-scheme in frontend/src. The settings.theme field is retained (still valid, now light-only) and is never used to toggle a dark class. --accent-glow remains only in the in-spec .landing-page block, untouched.

Closes #105

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 0bc5d2eb-8125-4b58-adf2-6c606e586dc7

📥 Commits

Reviewing files that changed from the base of the PR and between 824d7e4 and c93aa1a.

📒 Files selected for processing (2)

• frontend/src/app/globals.css
• frontend/src/components/screens/Settings.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-dead-dark-mode

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	frontend	c93aa1a	Commit Preview URL Branch Preview URL	Jun 12 2026, 04:58 AM