feat(temas): +17 esquemas do iTerm2-Color-Schemes (MIT)

- Dracula, Nord, Atom One Dark/Light, Monokai Pro, Gruvbox Dark/Light,
  Tokyo Night, Catppuccin Mocha/Latte, Tomorrow (Night), Ayu Mirage/Light,
  Kanagawa Wave, Nord Light, Carbon Paper — cores de UI e de tokens de
  sintaxe derivadas do Background/Foreground + ANSI 0–15 de cada .itermcolors
- Cada tema declara color-scheme (scrollbars/controles) e overrides de
  seleção/itens ativos; seletor de Preferências agrupado (21 temas)
- THEMES validado no loadPrefs; README com a lista e a atribuição

web/index.html

@@ -59,10 +59,33 @@
       <label class="row">Tamanho <input type="number" id="pf-size" min="10" max="32" step="1" class="num"> px</label>
       <label class="row">Esquema de cores
         <select id="pf-theme">
-          <option value="claro">Claro (Greybird — padrão)</option>
-          <option value="escuro">Escuro (Adwaita)</option>
-          <option value="solar-claro">Solarizado claro</option>
-          <option value="solar-escuro">Solarizado escuro</option>
+          <optgroup label="Nativos">
+            <option value="claro">Claro (Greybird — padrão)</option>
+            <option value="escuro">Escuro (Adwaita)</option>
+            <option value="solar-claro">Solarizado claro</option>
+            <option value="solar-escuro">Solarizado escuro</option>
+          </optgroup>
+          <optgroup label="iTerm2 — escuros">
+            <option value="dracula">Dracula</option>
+            <option value="nord">Nord</option>
+            <option value="one-dark">Atom One Dark</option>
+            <option value="monokai">Monokai Pro</option>
+            <option value="gruvbox-dark">Gruvbox Dark</option>
+            <option value="tokyo-night">Tokyo Night</option>
+            <option value="catppuccin-mocha">Catppuccin Mocha</option>
+            <option value="tomorrow-night">Tomorrow Night</option>
+            <option value="ayu-mirage">Ayu Mirage</option>
+            <option value="kanagawa-wave">Kanagawa Wave</option>
+          </optgroup>
+          <optgroup label="iTerm2 — claros">
+            <option value="catppuccin-latte">Catppuccin Latte</option>
+            <option value="gruvbox-light">Gruvbox Light</option>
+            <option value="one-light">Atom One Light</option>
+            <option value="nord-light">Nord Light</option>
+            <option value="carbon-paper">Carbon Paper</option>
+            <option value="tomorrow">Tomorrow</option>
+            <option value="ayu-light">Ayu Light</option>
+          </optgroup>
         </select>
       </label>
     </fieldset>