feat(renderer): AsciiGeneratorDialog (figlet text-to-ASCII-art)

src/renderer/components/modals/AsciiGeneratorDialog.tsx

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+import { useState, useEffect } from 'react';
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog';
+import { Button } from '@/components/ui/button';
+import { Label } from '@/components/ui/label';
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { Textarea } from '@/components/ui/textarea';
+import { useAppStore } from '@/stores/app-store';
+import { toast } from '@/lib/toast';
+import { figletText, FIGLET_FONTS, type FigletFont } from '@/lib/figlet';
+
+export function AsciiGeneratorDialog() {
+  const closeModal = useAppStore((s) => s.closeModal);
+  const [text, setText] = useState('Hello');
+  const [font, setFont] = useState<FigletFont>('Standard');
+  const [output, setOutput] = useState('');
+
+  useEffect(() => {
+    let cancelled = false;
+    figletText(text || ' ', font)
+      .then((result) => { if (!cancelled) setOutput(result); })
+      .catch(() => { if (!cancelled) setOutput('(render error)'); });
+    return () => { cancelled = true; };
+  }, [text, font]);
+
+  const handleCopy = async () => {
+    try {
+      await navigator.clipboard.writeText(output);
+      toast.success('Copied to clipboard');
+    } catch {
+      toast.error('Failed to copy');
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(o) => !o && closeModal()}>
+      <DialogContent aria-describedby="ascii-desc" className="max-w-2xl">
+        <DialogHeader>
+          <DialogTitle>ASCII generator</DialogTitle>
+          <DialogDescription id="ascii-desc">Type text, pick a font, see ASCII art</DialogDescription>
+        </DialogHeader>
+        <div className="space-y-3">
+          <div>
+            <Label htmlFor="ascii-text">Text</Label>
+            <Textarea
+              id="ascii-text"
+              aria-label="Text"
+              value={text}
+              onChange={(e) => setText(e.target.value)}
+              rows={2}
+            />
+          </div>
+          <div>
+            <Label htmlFor="ascii-font">Font</Label>
+            <Select value={font} onValueChange={(v) => setFont(v as FigletFont)}>
+              <SelectTrigger id="ascii-font" aria-label="Font"><SelectValue /></SelectTrigger>
+              <SelectContent>
+                {FIGLET_FONTS.map((f) => (
+                  <SelectItem key={f} value={f}>{f}</SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+          <div>
+            <Label>Output</Label>
+            <pre className="overflow-auto rounded border border-border bg-card/30 p-3 text-xs" data-testid="ascii-output">
+              {output}
+            </pre>
+          </div>
+        </div>
+        <DialogFooter>
+          <Button variant="ghost" onClick={closeModal}>Close</Button>
+          <Button onClick={handleCopy}>Copy</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/renderer/lib/figlet.ts

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+import figlet from 'figlet';
+import type { Fonts } from 'figlet';
+
+export const FIGLET_FONTS = ['Standard', 'Big', 'Small', 'Banner', 'Doom', 'Slant', 'Block'] as const;
+export type FigletFont = typeof FIGLET_FONTS[number];
+
+export function figletText(text: string, font: FigletFont): Promise<string> {
+  return new Promise((resolve, reject) => {
+    figlet.text(text, { font }, (err, result) => {
+      if (err) reject(err);
+      else resolve(result ?? '');
+    });
+  });
+}