root fdb2e9cda8 Fix browser crash: cache schema context, lazy Dashboard, default to Ask tab
Root cause: Dashboard auto-fired 6+ API calls on load, then Ask tab fired
7 DESCRIBE queries per question — 15+ concurrent requests from WASM.

Fixes:
- Schema context cached after first build (7 DESCRIBE → 0 on subsequent questions)
- Dashboard lazy-loads only when tab clicked (not on app mount)
- Default tab changed back to Ask (no background API storm)
- std::sync::Mutex for WASM compat (no tokio in browser)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-27 21:18:53 -05:00
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