feat(ui): theme skins — OG Codeman, Daylight Green, Daylight Blue

Add a per-device skin switcher in App Settings → Display:
- Three skins via html[data-skin]: og (original Codeman look),
  daylight-green, and daylight-blue (new default). Per-skin CSS-variable
  token blocks; the v1.0 "Carbon Aurora" component polish is scoped to
  non-og skins and parameterized so green/blue differ only by token values.
- Self-hosted Manrope (UI) + JetBrains Mono (terminal) variable fonts,
  served from /fonts (no external CDN, CSP-safe via font-src 'self').
- Per-skin xterm terminal theme with live re-theming of open terminals on
  skin change; skin-aware --term-bg so the terminal background fills cleanly
  (fixes the variable-height gap above the toolbar).
- Pre-paint inline script applies the saved skin before first paint (no
  flash); persisted per-device in localStorage + the settings blob, and
  kept out of the server settings payload (device-local).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/public/panels-ui.js

@@ -1550,29 +1550,7 @@ Object.assign(CodemanApp.prototype, {
       }
 
       const terminal = new Terminal({
-        theme: {
-          background: '#0d0d0d',
-          foreground: '#e0e0e0',
-          cursor: '#e0e0e0',
-          cursorAccent: '#0d0d0d',
-          selection: 'rgba(255, 255, 255, 0.3)',
-          black: '#0d0d0d',
-          red: '#ff6b6b',
-          green: '#51cf66',
-          yellow: '#ffd43b',
-          blue: '#339af0',
-          magenta: '#cc5de8',
-          cyan: '#22b8cf',
-          white: '#e0e0e0',
-          brightBlack: '#495057',
-          brightRed: '#ff8787',
-          brightGreen: '#69db7c',
-          brightYellow: '#ffe066',
-          brightBlue: '#5c7cfa',
-          brightMagenta: '#da77f2',
-          brightCyan: '#66d9e8',
-          brightWhite: '#ffffff',
-        },
+        theme: { ...window.codemanCurrentXtermTheme() },
         fontFamily: '"Fira Code", "Cascadia Code", "JetBrains Mono", "SF Mono", Monaco, monospace',
         fontSize: 12,
         lineHeight: 1.2,