Update Pricing and Features with Toggle

Summary

make the pricing $4.99/month and $49.99 yearly
add a toggle for month and yearly, use this library https://torph.lochie.me/ to move from monthly pricing to yearly, the animation

3.. the bookmarks and collections should be unlimited.
4. the stuff that are currently not available in the codebase that are under pricing, just archive it.

eg. Tags, dont add "(CSV/JSON)" remove, (JSON, HTML)

API Access, all of them remove.

Implemented. I moved pricing into a dedicated client component and wired a real monthly/yearly toggle with torph morph animation.

Added components/landing-pricing.tsx:1 with:
- a billing toggle (Monthly / Yearly) at components/landing-pricing.tsx:74
- TextMorph animation for plan price at components/landing-pricing.tsx:161
- updated Pro pricing: $4.99/month and $49.99/year at components/landing-pricing.tsx:47
Updated free limits to unlimited in components/landing-pricing.tsx:23:
- Unlimited bookmarks
- Unlimited collections
Archived/removed unavailable pricing items and cleaned copy in components/landing-pricing.tsx:39:
- removed Tags...
- removed API access...
- changed Export your data anytime (CSV/JSON) -> Export your data anytime
- changed Import from browser (JSON, HTML) -> Import from browser
Replaced inline pricing block with the new component in components/landing.tsx:15 and components/landing.tsx:169.
Installed torph in package.json:59 (and lockfile updated in bun.lock).

Verification run:

lsp_diagnostics on modified files: no errors
bun run typecheck: pass
bun run lint: pass
bun run build: pass
bun run test: fails due missing vitest.config.ts in repo script; bunx vitest run reports no test files present.