ui: visual polish — animations, icons, and interaction improvements

- Spin animation on ⟳ delivery status during SENDING/ENCRYPTING states
- Pulsing ● dot on PTT LIVE badge (pttLivePulse keyframe)
- Read receipt pill: hover scale/opacity transition, symmetric padding
- PiP resize handles: larger dots (5px), wider hit area (24px), higher contrast
- ForwardMessageDialog: position:relative on scroll container, spinner overlay 0.35 opacity
- Boot sequence: 45ms interval (was 65ms), brighter ESC hint (0.55 opacity)
- Location button: Icons.Pin → Icons.SpaceGlobe (globe icon)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lotus-boot.ts

@@ -65,7 +65,7 @@ export function runLotusBootSequence(force = false): void {
     'bottom:1.5rem',
     'right:2rem',
     'font-size:0.68rem',
-    'color:rgba(0,255,136,0.35)',
+    'color:rgba(0,255,136,0.55)',
     "font-family:'JetBrains Mono','Courier New',monospace",
     'letter-spacing:0.08em',
     'user-select:none',
@@ -105,5 +105,5 @@ export function runLotusBootSequence(force = false): void {
     text += `${BOOT_MESSAGES[i]}\n`;
     pre.textContent = text;
     i++;
-  }, 65);
+  }, 45);
 }