chore: shelve experimental ghostty-web integration

[aaditagrawal]

Summary

• Remove the WASM-based GhosttyTerminalSplitView component and its command palette entry — shelving for a later date once ghostty-web matures further
• Drop the ghostty-web dependency and related Vite config
• Clean up unused GhosttyIcon from Icons.tsx
• Update README provider table and supported agents list

Test plan

• bun typecheck — 7/7 clean
• bun lint — no new errors
• Command palette no longer shows ghostty toggle

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[aaditagrawal]

Will come back to you at a later date, libghostty. :)