create-rezi: flagship polished dashboard template + dashboard-only scaffolding

[RtlZeroMemory]

Summary

• ship a polished, product-style dashboard starter as the flagship create-rezi template
• refine dashboard UX for stable animation cadence, responsive controls, fixed-width dynamic labels, and coherent help modal styling
• update template docs and top-level docs/README to reflect dashboard-first scaffolding
• keep create-rezi template catalog dashboard-only for now (dashboard, alias dash)
• remove legacy starter template directories (form-app, file-browser, streaming-viewer)

Notes

• this PR is intentionally scoped to create-rezi + docs.
• core runtime/render fixes are tracked separately in core: stabilize animation tick cadence and single-select table focus #94 and should merge first.

Validation

• npm run build
• npm run check:create-rezi-templates
• npm run check:docs

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove app.stop calls from onEvent handlers

Calling stopDashboardAction() from app.onEvent causes app.stop() to run while createApp is inside an event handler, which violates stop()'s reentrancy guard (assertNotReentrant) and throws ZRUI_REENTRANT_CALL; in normal usage this path is hit by quit inputs (q/Ctrl+C), so the dashboard can enter a fatal error path instead of shutting down cleanly.

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[RtlZeroMemory]

Fixed in 8160b2c: shutdown now uses requestDashboardStop() which defers app.stop() via setTimeout(0) and deduplicates stop requests. This avoids reentrant stop() calls from onEvent/key handlers.