feat: reaction TDS styling, debounce read receipts, Escape to skip boot, type fixes

- lotus-terminal.css.ts: add reaction chip styles for dark + light TDS modes
  (cyan border/bg for unselected, orange accent for own/pressed reactions)
- useRoomReadPositions: debounce receipt handler at 150ms (M-3)
- lotus-boot.ts: Escape key skips boot animation (I-3)
- RoomInput.tsx: replace (uploadRes as any) with typed assertion (M-7)
- CallEmbedProvider: call mention detection, audio cleanup, display name (C-1, C-2, M-5)
- EventReaders: timestamps in seen-by modal, filter self, TDS styling
- ReadReceiptAvatars: StackedAvatar pill, TDS visual treatment
- chatBackground: add waves/neon/aurora backgrounds
- RoomView: auto-apply tactical bg when TDS active and bg is none
- settings: extend ChatBackground union type

src/lotus-boot.ts

@@ -29,6 +29,7 @@ export function resetBootSequence(): void {
 
 export function runLotusBootSequence(force = false): void {
   if (!force && sessionStorage.getItem(STORAGE_KEY)) return;
+  if (document.getElementById('lt-boot')) return;
   sessionStorage.setItem(STORAGE_KEY, '1');
 
   const overlay = document.createElement('div');
@@ -58,11 +59,25 @@ export function runLotusBootSequence(force = false): void {
   overlay.appendChild(pre);
   document.body.appendChild(overlay);
 
+  const dismiss = (): void => {
+    clearInterval(interval);
+    document.removeEventListener('keydown', onKey);
+    overlay.style.transition = 'opacity 0.4s ease';
+    overlay.style.opacity = '0';
+    setTimeout(() => overlay.remove(), 400);
+  };
+
+  const onKey = (e: KeyboardEvent): void => {
+    if (e.key === 'Escape') dismiss();
+  };
+  document.addEventListener('keydown', onKey);
+
   let i = 0;
   let text = '';
   const interval = setInterval(() => {
     if (i >= BOOT_MESSAGES.length) {
       clearInterval(interval);
+      document.removeEventListener('keydown', onKey);
       setTimeout(() => {
         overlay.style.transition = 'opacity 0.5s ease';
         overlay.style.opacity = '0';