feat: restyle themes to be visually distinct

- Minimal: Swiss Brutalist — fullbleed hero, true B&W, zero-gap grid, Geist font
- Editorial: Cinematic Magazine — warm charcoal, Bodoni Moda serif, slow transitions
- Classic: Gilded Gallery — gold accents, Cinzel headings, passepartout, ornamental dividers

Updated config presets, per-theme color palettes, ~550 lines of scoped CSS overrides,
data-preset attribute on html element, responsive breakpoints, screenshots, and docs.

lib/config.ts

@@ -58,19 +58,19 @@ const THEME_PRESETS: Record<string, ThemeConfig> = {
   },
   minimal: {
     preset: 'minimal',
-    accent: '#666666',
-    fonts: { heading: 'Inter', body: 'Inter', caption: 'JetBrains Mono' },
+    accent: '#000000',
+    fonts: { heading: 'Geist', body: 'Geist', caption: 'IBM Plex Mono' },
     radius: 0,
     photoFrame: 'none',
     grain: false,
     headerDot: false,
-    heroStyle: 'split',
+    heroStyle: 'fullbleed',
   },
   editorial: {
     preset: 'editorial',
-    accent: '#1a1a1a',
-    fonts: { heading: 'Libre Baskerville', body: 'Source Sans 3', caption: 'Source Sans 3' },
-    radius: 4,
+    accent: '#8B2500',
+    fonts: { heading: 'Bodoni Moda', body: 'Newsreader', caption: 'Spectral' },
+    radius: 0,
     photoFrame: 'shadow',
     grain: false,
     headerDot: false,
@@ -78,13 +78,13 @@ const THEME_PRESETS: Record<string, ThemeConfig> = {
   },
   classic: {
     preset: 'classic',
-    accent: '#8b6914',
-    fonts: { heading: 'Cormorant Garamond', body: 'Lato', caption: 'Lato' },
-    radius: 8,
-    photoFrame: 'none',
+    accent: '#c49a3c',
+    fonts: { heading: 'Cinzel', body: 'Crimson Pro', caption: 'Crimson Pro' },
+    radius: 12,
+    photoFrame: 'passepartout',
     grain: false,
-    headerDot: false,
-    heroStyle: 'split',
+    headerDot: true,
+    heroStyle: 'minimal',
   },
 };