refactor(ascii): align layout and UX with Calculate blueprint

Rewrites all four ASCII tool components to share the same design
language and spatial structure as the Calculator & Grapher tool.

Layout
- New responsive 2/5–3/5 grid (was fixed 2+1 col); matches Calculate
- Left panel: text input card + font selector filling remaining height
- Right panel: preview as the dominant full-height element
- Mobile: tabbed Editor / Preview switcher (same pattern as Calculator)

TextInput
- Replace shadcn Textarea with native <textarea>
- Glass border pattern (border-border/40, focus:border-primary/50)
- Monospace font, consistent counter styling

FontSelector
- Replace Card + shadcn Tabs + Button + Input + Empty with native elements
- Glass panel (glass rounded-xl) matching Calculate panel style
- Custom tab strip mirrors Calculator mobile tab pattern
- Native search input with glass border
- Font list items: border-l-2 left accent for selected state,
  hover:bg-primary/8, rose heart for favorites
- Auto-scrolls selected item into view on external changes
- Simplified empty state to single italic line

FontPreview
- Replace Card + Button + Badge + ToggleGroup + Tooltip + Empty
- Glass panel with header row (label + font tag + action buttons)
- Controls row: native toggle buttons with primary/10 active state
- Terminal window: dark #06060e background, macOS-style chrome
  (rose/amber/emerald dots), font name watermark — the hero element
- PNG export captures entire terminal including chrome at 2x
- Inline skeleton loader with pulse animation replaces Skeleton import

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

components/ascii/FontPreview.tsx

@@ -2,11 +2,6 @@
 
 import * as React from 'react';
 import { toPng } from 'html-to-image';
-import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
-import { Button } from '@/components/ui/button';
-import { Skeleton } from '@/components/ui/skeleton';
-import { Badge } from '@/components/ui/badge';
-import { ToggleGroup, ToggleGroupItem } from '@/components/ui/toggle-group';
 import {
   Select,
   SelectContent,
@@ -15,18 +10,16 @@ import {
   SelectValue,
 } from '@/components/ui/select';
 import {
-  Tooltip,
-  TooltipContent,
-  TooltipTrigger,
-} from '@/components/ui/tooltip';
-import {
-  Empty,
-  EmptyDescription,
-  EmptyHeader,
-  EmptyMedia,
-  EmptyTitle,
-} from "@/components/ui/empty"
-import { Copy, Download, Share2, Image as ImageIcon, AlignLeft, AlignCenter, AlignRight, Type, MessageSquareCode } from 'lucide-react';
+  Copy,
+  Download,
+  Share2,
+  Image as ImageIcon,
+  AlignLeft,
+  AlignCenter,
+  AlignRight,
+  MessageSquareCode,
+  Type,
+} from 'lucide-react';
 import { cn } from '@/lib/utils/cn';
 import { toast } from 'sonner';
 
@@ -34,12 +27,12 @@ export type CommentStyle = 'none' | '//' | '#' | '--' | ';' | '/* */' | '<!-- --
 
 const COMMENT_STYLES: { value: CommentStyle; label: string }[] = [
   { value: 'none', label: 'None' },
-  { value: '//', label: '// C, JS, Go' },
-  { value: '#', label: '# Python, Shell' },
-  { value: '--', label: '-- SQL, Lua' },
-  { value: ';', label: '; Lisp, ASM' },
-  { value: '/* */', label: '/* */ Block' },
-  { value: '<!-- -->', label: '<!-- --> HTML' },
+  { value: '//', label: '// C / JS / Go' },
+  { value: '#', label: '# Python / Shell' },
+  { value: '--', label: '-- SQL / Lua' },
+  { value: ';', label: '; Lisp / ASM' },
+  { value: '/* */', label: '/* Block */' },
+  { value: '<!-- -->', label: '<!-- HTML -->' },
   { value: '"""', label: '""" Docstring' },
 ];
 
@@ -51,9 +44,9 @@ function applyCommentStyle(text: string, style: CommentStyle): string {
     case '#':
     case '--':
     case ';':
-      return lines.map(line => `${style} ${line}`).join('\n');
+      return lines.map((l) => `${style} ${l}`).join('\n');
     case '/* */':
-      return ['/*', ...lines.map(line => ` * ${line}`), ' */'].join('\n');
+      return ['/*', ...lines.map((l) => ` * ${l}`), ' */'].join('\n');
     case '<!-- -->':
       return ['<!--', ...lines, '-->'].join('\n');
     case '"""':
@@ -73,14 +66,39 @@ export interface FontPreviewProps {
 }
 
 type TextAlign = 'left' | 'center' | 'right';
+type FontSize = 'xs' | 'sm' | 'base';
 
-export function FontPreview({ text, font, isLoading, onCopy, onDownload, onShare, onCommentedTextChange, className }: FontPreviewProps) {
-  const previewRef = React.useRef<HTMLDivElement>(null);
+const ALIGN_OPTS: { value: TextAlign; icon: React.ElementType; label: string }[] = [
+  { value: 'left', icon: AlignLeft, label: 'Left' },
+  { value: 'center', icon: AlignCenter, label: 'Center' },
+  { value: 'right', icon: AlignRight, label: 'Right' },
+];
+
+const SIZE_OPTS: { value: FontSize; label: string }[] = [
+  { value: 'xs', label: 'xs' },
+  { value: 'sm', label: 'sm' },
+  { value: 'base', label: 'md' },
+];
+
+export function FontPreview({
+  text,
+  font,
+  isLoading,
+  onCopy,
+  onDownload,
+  onShare,
+  onCommentedTextChange,
+  className,
+}: FontPreviewProps) {
+  const terminalRef = React.useRef<HTMLDivElement>(null);
   const [textAlign, setTextAlign] = React.useState<TextAlign>('left');
-  const [fontSize, setFontSize] = React.useState<'xs' | 'sm' | 'base'>('sm');
+  const [fontSize, setFontSize] = React.useState<FontSize>('sm');
   const [commentStyle, setCommentStyle] = React.useState<CommentStyle>('none');
 
-  const commentedText = React.useMemo(() => applyCommentStyle(text, commentStyle), [text, commentStyle]);
+  const commentedText = React.useMemo(
+    () => applyCommentStyle(text, commentStyle),
+    [text, commentStyle]
+  );
   const lineCount = commentedText ? commentedText.split('\n').length : 0;
   const charCount = commentedText ? commentedText.length : 0;
 
@@ -89,183 +107,181 @@ export function FontPreview({ text, font, isLoading, onCopy, onDownload, onShare
   }, [commentedText, onCommentedTextChange]);
 
   const handleExportPNG = async () => {
-    if (!previewRef.current || !text) return;
-
+    if (!terminalRef.current || !text) return;
     try {
-      const dataUrl = await toPng(previewRef.current, {
-        backgroundColor: getComputedStyle(previewRef.current).backgroundColor,
+      const dataUrl = await toPng(terminalRef.current, {
+        backgroundColor: '#06060e',
         pixelRatio: 2,
       });
-
       const link = document.createElement('a');
       link.download = `ascii-${font || 'export'}-${Date.now()}.png`;
       link.href = dataUrl;
       link.click();
-
       toast.success('Exported as PNG!');
-    } catch (error) {
-      console.error('Failed to export PNG:', error);
+    } catch {
       toast.error('Failed to export PNG');
     }
   };
 
+  const actionBtn =
+    'flex items-center gap-1 px-2.5 py-1 text-xs glass rounded-md border border-border/30 text-muted-foreground hover:text-primary hover:border-primary/30 hover:bg-primary/10 transition-all';
+
   return (
-    <Card className={cn('relative', className)}>
-      <CardHeader className="flex flex-row items-center justify-between flex-wrap gap-2">
+    <div className={cn('glass rounded-xl p-4 flex flex-col gap-3 flex-1 min-h-0 overflow-hidden', className)}>
+
+      {/* ── Header: label + font tag + export actions ─────────── */}
+      <div className="flex items-center justify-between gap-2 shrink-0 flex-wrap">
         <div className="flex items-center gap-2">
-          <CardTitle>Preview</CardTitle>
+          <span className="text-[10px] font-semibold text-muted-foreground uppercase tracking-widest">
+            Preview
+          </span>
           {font && (
-            <Badge className="text-[10px] font-mono">
+            <span className="px-2 py-0.5 rounded-md bg-primary/10 text-primary text-[10px] font-mono border border-primary/20">
               {font}
-            </Badge>
+            </span>
           )}
         </div>
-        <div className="flex gap-1.5 flex-wrap">
+        <div className="flex items-center gap-1.5 flex-wrap">
           {onCopy && (
-            <Tooltip>
-              <TooltipTrigger asChild>
-                <Button variant="outline" size="xs" onClick={onCopy}>
-                  <Copy className="h-3 w-3 mr-1" />
-                  Copy
-                </Button>
-              </TooltipTrigger>
-              <TooltipContent>Copy to clipboard</TooltipContent>
-            </Tooltip>
+            <button onClick={onCopy} className={actionBtn}>
+              <Copy className="w-3 h-3" /> Copy
+            </button>
           )}
           {onShare && (
-            <Tooltip>
-              <TooltipTrigger asChild>
-                <Button variant="outline" size="xs" onClick={onShare}>
-                  <Share2 className="h-3 w-3 mr-1" />
-                  Share
-                </Button>
-              </TooltipTrigger>
-              <TooltipContent>Copy shareable URL</TooltipContent>
-            </Tooltip>
+            <button onClick={onShare} className={actionBtn}>
+              <Share2 className="w-3 h-3" /> Share
+            </button>
           )}
-          <Tooltip>
-            <TooltipTrigger asChild>
-              <Button variant="outline" size="xs" onClick={handleExportPNG}>
-                <ImageIcon className="h-3 w-3 mr-1" />
-                PNG
-              </Button>
-            </TooltipTrigger>
-            <TooltipContent>Export as PNG</TooltipContent>
-          </Tooltip>
+          <button onClick={handleExportPNG} className={actionBtn}>
+            <ImageIcon className="w-3 h-3" /> PNG
+          </button>
           {onDownload && (
-            <Tooltip>
-              <TooltipTrigger asChild>
-                <Button variant="outline" size="xs" onClick={onDownload}>
-                  <Download className="h-3 w-3 mr-1" />
-                  TXT
-                </Button>
-              </TooltipTrigger>
-              <TooltipContent>Download as text file</TooltipContent>
-            </Tooltip>
+            <button onClick={onDownload} className={actionBtn}>
+              <Download className="w-3 h-3" /> TXT
+            </button>
           )}
         </div>
-      </CardHeader>
-      <CardContent className="space-y-3">
-        {/* Controls */}
-        <div className="flex items-center gap-2 flex-wrap">
-          <ToggleGroup
-            type="single"
-            value={textAlign}
-            onValueChange={(v) => v && setTextAlign(v as TextAlign)}
-            variant="outline"
-            size="sm"
-            disabled={commentStyle !== 'none'}
-          >
-            <ToggleGroupItem value="left" aria-label="Align left" className="px-1.5">
-              <AlignLeft className="h-3 w-3" />
-            </ToggleGroupItem>
-            <ToggleGroupItem value="center" aria-label="Align center" className="px-1.5">
-              <AlignCenter className="h-3 w-3" />
-            </ToggleGroupItem>
-            <ToggleGroupItem value="right" aria-label="Align right" className="px-1.5">
-              <AlignRight className="h-3 w-3" />
-            </ToggleGroupItem>
-          </ToggleGroup>
+      </div>
 
-          <ToggleGroup
-            type="single"
-            value={fontSize}
-            onValueChange={(v) => v && setFontSize(v as 'xs' | 'sm' | 'base')}
-            variant="outline"
-            size="sm"
-          >
-            <ToggleGroupItem value="xs" aria-label="Extra small font" className="px-1.5 text-[10px] uppercase">
-              xs
-            </ToggleGroupItem>
-            <ToggleGroupItem value="sm" aria-label="Small font" className="px-1.5 text-[10px] uppercase">
-              sm
-            </ToggleGroupItem>
-            <ToggleGroupItem value="base" aria-label="Medium font" className="px-1.5 text-[10px] uppercase">
-              md
-            </ToggleGroupItem>
-          </ToggleGroup>
+      {/* ── Controls: alignment · size · comment style ─────────── */}
+      <div className="flex items-center gap-2 shrink-0 flex-wrap">
+        {/* Alignment */}
+        <div className="flex items-center gap-0.5">
+          {ALIGN_OPTS.map(({ value, icon: Icon, label }) => (
+            <button
+              key={value}
+              onClick={() => setTextAlign(value)}
+              disabled={commentStyle !== 'none'}
+              title={label}
+              className={cn(
+                'px-2 py-1 rounded-md transition-all border text-xs',
+                textAlign === value && commentStyle === 'none'
+                  ? 'bg-primary/10 border-primary/30 text-primary'
+                  : 'glass border-transparent text-muted-foreground/55 hover:text-foreground hover:border-border/40',
+                commentStyle !== 'none' && 'opacity-30 cursor-not-allowed'
+              )}
+            >
+              <Icon className="w-3 h-3" />
+            </button>
+          ))}
+        </div>
 
-          <Select value={commentStyle} onValueChange={(v) => setCommentStyle(v as CommentStyle)}>
-            <SelectTrigger size="sm" className="h-8 w-auto gap-1 text-xs">
-              <MessageSquareCode className="h-3 w-3 text-foreground shrink-0" />
-              <SelectValue />
-            </SelectTrigger>
-            <SelectContent>
-              {COMMENT_STYLES.map((s) => (
-                <SelectItem key={s.value} value={s.value}>
-                  {s.label}
-                </SelectItem>
-              ))}
-            </SelectContent>
-          </Select>
+        {/* Font size */}
+        <div className="flex items-center gap-0.5">
+          {SIZE_OPTS.map(({ value, label }) => (
+            <button
+              key={value}
+              onClick={() => setFontSize(value)}
+              className={cn(
+                'px-2 py-1 text-[10px] font-mono rounded-md transition-all border uppercase',
+                fontSize === value
+                  ? 'bg-primary/10 border-primary/30 text-primary'
+                  : 'glass border-transparent text-muted-foreground/55 hover:text-foreground hover:border-border/40'
+              )}
+            >
+              {label}
+            </button>
+          ))}
+        </div>
 
-          {!isLoading && text && (
-            <div className="flex gap-2 text-[10px] text-muted-foreground ml-auto">
-              <span>{lineCount} lines</span>
-              <span>{charCount} chars</span>
-            </div>
+        {/* Comment style */}
+        <Select value={commentStyle} onValueChange={(v) => setCommentStyle(v as CommentStyle)}>
+          <SelectTrigger className="h-7 w-auto gap-1.5 text-xs border-border/30 bg-transparent hover:border-primary/30 transition-colors">
+            <MessageSquareCode className="w-3 h-3 text-muted-foreground/60 shrink-0" />
+            <SelectValue />
+          </SelectTrigger>
+          <SelectContent>
+            {COMMENT_STYLES.map((s) => (
+              <SelectItem key={s.value} value={s.value}>
+                {s.label}
+              </SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+
+        {/* Stats */}
+        {!isLoading && text && (
+          <span className="ml-auto text-[10px] text-muted-foreground/30 font-mono tabular-nums">
+            {lineCount}L · {charCount}C
+          </span>
+        )}
+      </div>
+
+      {/* ── Terminal window ────────────────────────────────────── */}
+      <div
+        ref={terminalRef}
+        className="flex-1 min-h-0 flex flex-col rounded-xl overflow-hidden border border-white/5"
+        style={{ background: '#06060e' }}
+      >
+        {/* Terminal chrome */}
+        <div className="flex items-center gap-1.5 px-3.5 py-2 border-b border-white/5 shrink-0">
+          <div className="w-2.5 h-2.5 rounded-full bg-rose-500/55" />
+          <div className="w-2.5 h-2.5 rounded-full bg-amber-400/55" />
+          <div className="w-2.5 h-2.5 rounded-full bg-emerald-500/55" />
+          {font && (
+            <span className="ml-2 text-[10px] font-mono text-white/20 tracking-wider select-none">
+              {font}
+            </span>
           )}
         </div>
 
+        {/* Content */}
         <div
-          ref={previewRef}
-          className={cn(
-            'relative min-h-[200px] bg-muted/50 rounded-lg p-4 overflow-x-auto',
-            commentStyle === 'none' && textAlign === 'center' && 'text-center',
-            commentStyle === 'none' && textAlign === 'right' && 'text-right'
-          )}
+          className="flex-1 overflow-auto p-4 scrollbar-thin scrollbar-thumb-white/8 scrollbar-track-transparent"
+          style={{ textAlign: commentStyle === 'none' ? textAlign : 'left' }}
         >
           {isLoading ? (
-            <div className="space-y-3">
-              <Skeleton className="h-6 w-3/4" />
-              <Skeleton className="h-6 w-full" />
-              <Skeleton className="h-6 w-5/6" />
-              <Skeleton className="h-6 w-2/3" />
-              <Skeleton className="h-6 w-full" />
-              <Skeleton className="h-6 w-4/5" />
+            <div className="space-y-2 animate-pulse">
+              {[0.7, 1, 0.85, 0.55, 1, 0.9, 0.75].map((w, i) => (
+                <div
+                  key={i}
+                  className="h-3.5 rounded-sm bg-white/5"
+                  style={{ width: `${w * 100}%` }}
+                />
+              ))}
             </div>
           ) : text ? (
-            <pre className={cn(
-              'font-mono whitespace-pre overflow-x-auto animate-in',
-              fontSize === 'xs' && 'text-[10px]',
-              fontSize === 'sm' && 'text-xs sm:text-sm',
-              fontSize === 'base' && 'text-sm sm:text-base'
-            )}>
+            <pre
+              className={cn(
+                'font-mono whitespace-pre text-white/85 leading-snug',
+                fontSize === 'xs' && 'text-[9px]',
+                fontSize === 'sm' && 'text-[11px] sm:text-xs',
+                fontSize === 'base' && 'text-xs sm:text-sm'
+              )}
+            >
               {commentedText}
             </pre>
           ) : (
-            <Empty>
-              <EmptyHeader>
-                <EmptyMedia variant="icon">
-                  <Type />
-                </EmptyMedia>
-                <EmptyTitle>Start typing to see your ASCII art</EmptyTitle>
-                <EmptyDescription>Enter text in the input field above to generate ASCII art with the selected font</EmptyDescription>
-              </EmptyHeader>
-            </Empty>
+            <div className="h-full flex flex-col items-center justify-center gap-2 text-center">
+              <Type className="w-6 h-6 text-white/10" />
+              <p className="text-xs text-white/20 font-mono">
+                Start typing to see your ASCII art
+              </p>
+            </div>
           )}
         </div>
-      </CardContent>
-    </Card>
+      </div>
+
+    </div>
   );
 }