Deepen TDS integration: full terminal CSS coverage + 3 new backgrounds

Terminal Mode:
- Text selection: orange highlight rgba(255,107,0,0.28)
- Links: cyan (#00D4FF) with orange hover glow (#FF6B00)
- Code/pre: TDS green (#00FF88) on terminal bg, left green border
- Strong/b → orange, em/i → cyan, mark → amber, del → red
- Blockquote: orange left border (matches chat reply quotes)
- HR: cyan border with dim glow
- Input/textarea/[contenteditable] focus: orange glow ring
- Tables: TDS headers (orange+uppercase), cyan borders, hover rows
- List markers: cyan ▸ for ul, orange for ol
- Boot box-drawing alignment fixed (51→52 ═)
- data-theme=\"dark\" set on html element when terminal active
- Updated description: correct TDS palette names
- ▶ Boot replay button in settings (visible when terminal on)

Chat backgrounds (+3):
- Tactical: LotusGuild TDS exact cyan dot-grid (28px)
- Circuit: green grid + node dots on dark terminal bg
- Hex Grid: isometric cyan hexagonal outlines

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

src/app/features/lotus/chatBackground.ts

@@ -13,6 +13,9 @@ export const BG_OPTIONS: { value: ChatBackground; label: string }[] = [
   { value: 'polka', label: 'Polka' },
   { value: 'triangles', label: 'Triangles' },
   { value: 'plaid', label: 'Plaid' },
+  { value: 'tactical', label: 'Tactical' },
+  { value: 'circuit', label: 'Circuit' },
+  { value: 'hexgrid', label: 'Hex Grid' },
 ];
 
 const DARK: Record<ChatBackground, CSSProperties> = {
@@ -118,6 +121,36 @@ const DARK: Record<ChatBackground, CSSProperties> = {
       'repeating-linear-gradient(90deg, transparent, transparent 7px, rgba(152,0,0,0.08) 7px, rgba(152,0,0,0.08) 8px)',
     ].join(','),
   },
+
+  // LotusGuild TDS exact dot-grid
+  tactical: {
+    backgroundColor: '#030508',
+    backgroundImage: 'radial-gradient(circle, rgba(0,212,255,0.055) 1px, transparent 1px)',
+    backgroundSize: '28px 28px',
+  },
+
+  // Circuit board — green grid with node dots
+  circuit: {
+    backgroundColor: '#040a04',
+    backgroundImage: [
+      'linear-gradient(rgba(0,255,136,0.045) 1px, transparent 1px)',
+      'linear-gradient(90deg, rgba(0,255,136,0.045) 1px, transparent 1px)',
+      'radial-gradient(circle, rgba(0,255,136,0.20) 1.5px, transparent 1.5px)',
+    ].join(','),
+    backgroundSize: '40px 40px, 40px 40px, 40px 40px',
+    backgroundPosition: '0 0, 0 0, 20px 20px',
+  },
+
+  // Isometric hex grid — cyan outlines
+  hexgrid: {
+    backgroundColor: '#060c14',
+    backgroundImage: [
+      'linear-gradient(60deg, rgba(0,212,255,0.07) 25%, transparent 25%, transparent 75%, rgba(0,212,255,0.07) 75%)',
+      'linear-gradient(120deg, rgba(0,212,255,0.07) 25%, transparent 25%, transparent 75%, rgba(0,212,255,0.07) 75%)',
+    ].join(','),
+    backgroundSize: '30px 52px',
+    backgroundPosition: '0 0, 15px 26px',
+  },
 };
 
 const LIGHT: Record<ChatBackground, CSSProperties> = {
@@ -220,6 +253,33 @@ const LIGHT: Record<ChatBackground, CSSProperties> = {
       'repeating-linear-gradient(90deg, transparent, transparent 7px, rgba(200,0,0,0.09) 7px, rgba(200,0,0,0.09) 8px)',
     ].join(','),
   },
+
+  tactical: {
+    backgroundColor: '#f0f4fa',
+    backgroundImage: 'radial-gradient(circle, rgba(0,100,200,0.08) 1px, transparent 1px)',
+    backgroundSize: '28px 28px',
+  },
+
+  circuit: {
+    backgroundColor: '#f0f8f0',
+    backgroundImage: [
+      'linear-gradient(rgba(0,160,80,0.06) 1px, transparent 1px)',
+      'linear-gradient(90deg, rgba(0,160,80,0.06) 1px, transparent 1px)',
+      'radial-gradient(circle, rgba(0,160,80,0.22) 1.5px, transparent 1.5px)',
+    ].join(','),
+    backgroundSize: '40px 40px, 40px 40px, 40px 40px',
+    backgroundPosition: '0 0, 0 0, 20px 20px',
+  },
+
+  hexgrid: {
+    backgroundColor: '#f4f8ff',
+    backgroundImage: [
+      'linear-gradient(60deg, rgba(50,100,220,0.08) 25%, transparent 25%, transparent 75%, rgba(50,100,220,0.08) 75%)',
+      'linear-gradient(120deg, rgba(50,100,220,0.08) 25%, transparent 25%, transparent 75%, rgba(50,100,220,0.08) 75%)',
+    ].join(','),
+    backgroundSize: '30px 52px',
+    backgroundPosition: '0 0, 15px 26px',
+  },
 };
 
 export const getChatBg = (bg: ChatBackground, isDark: boolean): CSSProperties =>