add boot themes

src/commands/handlers.ts

@@ -1,4 +1,5 @@
 import type { LineColor } from '../components/BootSequence';
+import { BOOT_SCREENS } from '../components/MatrixRain';
 
 export interface OutputLine {
   text: string;
@@ -211,6 +212,30 @@ export const handlers: Record<string, CommandHandler> = {
     return [red(`rm: cannot remove '${args[args.length - 1]}': Permission denied`)];
   },
 
+  theme: (args) => {
+    if (args.length === 0) {
+      const current = localStorage.getItem('stift15-bootscreen') || 'logo';
+      return [
+        amber('Boot screen themes:'),
+        ...BOOT_SCREENS.map((s) =>
+          green(`  ${s === current ? '▸ ' : '  '}${s}`)
+        ),
+        dim(''),
+        dim(`Usage: theme <name>`),
+        dim('Run "reboot" to see the new boot screen.'),
+      ];
+    }
+    const name = args[0].toLowerCase();
+    if (!BOOT_SCREENS.includes(name)) {
+      return [red(`theme: '${name}' not found. Available: ${BOOT_SCREENS.join(', ')}`)];
+    }
+    localStorage.setItem('stift15-bootscreen', name);
+    return [
+      green(`Boot screen set to '${name}'.`),
+      dim('Run "reboot" to see it.'),
+    ];
+  },
+
   sudo: (args) => {
     if (args.length === 0) return [red('sudo: missing command')];
     return [