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feat: WebSocket real-time + rAF render gate + guest board + screen picker

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Classroom performance:
- WebSocket server (ws-server.js) for low-latency cursor & stroke preview
  Replaces HTTP POST per event → eliminates per-message auth overhead
  Session member cache (30s TTL) avoids SQLite query per WS message
  Fallback to HTTP POST when WS not connected
- Cursor throttle reduced 100ms → 33ms (~30fps)
- Stroke preview throttle reduced 50ms → 20ms
- whiteboard.js: render() is now rAF-gated (_doRender/_rafPending)
  Multiple render() calls within one frame collapse into one repaint
  document.hidden check — zero CPU when tab is in background
  visibilitychange listener restores canvas on tab focus

Guest board:
- guestClassroom.js route: public token-based read-only access
- guest-board.html: name entry + read-only whiteboard + SSE
- SSE: addGuestClient/removeGuestClient/emitToGuests

Screen share picker:
- Discord-style modal with tab switching (screen/window/tab)
- Live video preview before confirming share
- useExistingScreenStream() in ClassroomRTC

Fullscreen exit overlay:
- #cr-fs-exit-overlay button inside cr-board-wrap
- Visible only via CSS :fullscreen selector (touchpad users)

File sharing from library:
- Teacher picks file from library, sends as styled card in chat
- crDownloadLibraryFile() fetches with Bearer auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Maxim Dolgolyov
2026-04-13 18:04:59 +03:00
parent 074ee5687b
commit fd29acbbdd
70 changed files with 12231 additions and 498 deletions
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frontend/js/labs/triangle.js
+2 -2
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@@ -792,7 +792,7 @@ class TriangleSim {
// Formula
this._drawFormulaBox(ctx, this.W, this.H,
`${oppSideName}² = ${adjSide1Name}² + ${adjSide2Name}² − 2·${adjSide1Name}·${adjSide2Name}·cos${angName} <svg class="ic" viewBox="0 0 24 24"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg> ${c2.toFixed(2)} = ${check.toFixed(2)}`,
`${oppSideName}² = ${adjSide1Name}² + ${adjSide2Name}² \u2212 2\u00B7${adjSide1Name}\u00B7${adjSide2Name}\u00B7cos${angName} \u2192 ${c2.toFixed(2)} = ${check.toFixed(2)}`,
'#fbbf24');
ctx.restore();
@@ -845,7 +845,7 @@ class TriangleSim {
const diff = Math.abs(hypArea - (leg1Area + leg2Area));
const statusCol = isRight ? '#22d55e' : '#f59e0b';
const statusText = isRight
? `<svg class="ic" viewBox="0 0 24 24"><polyline points="20 6 9 17 4 12"/></svg> ${leg1Name}² + ${leg2Name}² = ${hypName}² (${(leg1Area + leg2Area).toFixed(2)} = ${hypArea.toFixed(2)})`
? `\u2713 ${leg1Name}\u00B2 + ${leg2Name}\u00B2 = ${hypName}\u00B2 (${(leg1Area + leg2Area).toFixed(2)} = ${hypArea.toFixed(2)})`
: `${leg1Name}² + ${leg2Name}² = ${(leg1Area + leg2Area).toFixed(2)} ≠ ${hypName}² = ${hypArea.toFixed(2)} (Δ = ${diff.toFixed(2)})`;
this._drawFormulaBox(ctx, this.W, this.H, statusText, statusCol);