feat(site): reframe the landing around rich interactive software

[doodlewind]

What

Rewrites the landing page (plus site title/description) around the core value proposition:

PocketJS is a compact JavaScript runtime for building UI, games, 3D experiences, and AI-native applications across radically different devices.

The previous landing (#199/#201) led with the devices. This pass keeps its visual system untouched — same CSS, same section skeletons — and re-centers the copy on the runtime and the breadth of software it carries, folding in the capability updates that landed since (#203 Octane, #205 Playdate, #209–#215 touch stack).

Changes

• Hero — Rich interactive JavaScript / where no browser fits., with the four software pillars and "radically different devices" in the sub. Eyebrow now points at the Octane post (newest).
• New pillars section after the proof strip: User interfaces / Games / 3D experiences / AI-native apps — each claim backed by a shipped link (frameworks doc, OpenStrike, Pocket Character, the can't-flake post + pocket-pi).
• Proof strip — the Symbian cell becomes "Three frameworks, one core" (Octane); Symbian remains in the target tabs, device grid, and showcase.
• Targets — Octane named in the lead and the reactivity card; new Playdate tab (Pocket Vapor AOT, the crank as a signed relative axis, ships as .pdx).
• Devices — kicker/lead adopt "radically different"; "Retro consoles" → "Consoles & handhelds" with a live Playdate chip (integrate Playdate target, host input, and example apps #205), mirrored in the JSON-LD platform list.
• System software — the Input & OSK card catches up with the touch stack (gestures, kinetic scroll, tap-to-press).
• Meta — SITE_TITLE/SITE_DESC restate the value proposition; og:image:alt now derives from SITE_TITLE instead of a hardcoded copy of the old tagline.

Deliberately not claimed: the audio module (#217, not merged) and the iPhone 2G host (#219, draft).

Verification

• bun run site:build clean.
• Headless-Chrome pass over the built page (site/verify.ts): zero page/console errors, Pocket Stage hero canvas renders (90% non-black), Playdate tab panel opens, desktop (1400px) and mobile (390px) screenshots eyeballed.
• Every new link resolves to an existing blog slug, doc page, or public repo.

🤖 Generated with Claude Code