feat: add Forest, Mono, and Cyberpunk color themes

Forest — deep green surfaces (#0a130d base) with green-400 accent.
  Inspired by terminal emulators and dark mode IDE forest schemes.

Mono — near-black zinc-950 surface with pure white/zinc-100 accent.
  Minimal high-contrast monochromatic palette for distraction-free reading.

Cyber — near-black blue surface with neon cyan-400 accent and dracula-palette
  success/danger colors. Cyberpunk aesthetic with neon glow feel.

Changes:
- app.css: three new [data-theme] blocks with full token sets
- +layout.svelte: added forest/mono/cyber to THEMES array (before light themes)
- profile/+page.svelte: same additions with i18n label functions
- messages/*.json: translated names in all 5 locales (en/fr/ru/pt/id)

ui/messages/en.json

@@ -161,6 +161,9 @@
   "profile_theme_amber": "Amber",
   "profile_theme_slate": "Slate",
   "profile_theme_rose": "Rose",
+  "profile_theme_forest": "Forest",
+  "profile_theme_mono": "Mono",
+  "profile_theme_cyber": "Cyberpunk",
   "profile_theme_light": "Light",
   "profile_theme_light_slate": "Light Blue",
   "profile_theme_light_rose": "Light Rose",

ui/messages/fr.json

@@ -161,6 +161,9 @@
   "profile_theme_amber": "Ambre",
   "profile_theme_slate": "Ardoise",
   "profile_theme_rose": "Rose",
+  "profile_theme_forest": "Forêt",
+  "profile_theme_mono": "Mono",
+  "profile_theme_cyber": "Cyberpunk",
   "profile_theme_light": "Light",
   "profile_theme_light_slate": "Light Blue",
   "profile_theme_light_rose": "Light Rose",

ui/messages/id.json

@@ -161,6 +161,9 @@
   "profile_theme_amber": "Amber",
   "profile_theme_slate": "Abu-abu",
   "profile_theme_rose": "Mawar",
+  "profile_theme_forest": "Hutan",
+  "profile_theme_mono": "Mono",
+  "profile_theme_cyber": "Cyberpunk",
   "profile_theme_light": "Light",
   "profile_theme_light_slate": "Light Blue",
   "profile_theme_light_rose": "Light Rose",

ui/messages/pt.json

@@ -161,6 +161,9 @@
   "profile_theme_amber": "Âmbar",
   "profile_theme_slate": "Ardósia",
   "profile_theme_rose": "Rosa",
+  "profile_theme_forest": "Floresta",
+  "profile_theme_mono": "Mono",
+  "profile_theme_cyber": "Cyberpunk",
   "profile_theme_light": "Light",
   "profile_theme_light_slate": "Light Blue",
   "profile_theme_light_rose": "Light Rose",

ui/messages/ru.json

@@ -161,6 +161,9 @@
   "profile_theme_amber": "Янтарь",
   "profile_theme_slate": "Сланец",
   "profile_theme_rose": "Роза",
+  "profile_theme_forest": "Лес",
+  "profile_theme_mono": "Моно",
+  "profile_theme_cyber": "Киберпанк",
   "profile_theme_light": "Light",
   "profile_theme_light_slate": "Light Blue",
   "profile_theme_light_rose": "Light Rose",

ui/src/app.css

@@ -97,6 +97,48 @@
 	--color-success:   #16a34a;   /* green-600 */
 }
 
+/* ── Forest theme — dark green ────────────────────────────────────────── */
+[data-theme="forest"] {
+	--color-brand:     #4ade80;   /* green-400 */
+	--color-brand-dim: #16a34a;   /* green-600 */
+	--color-surface:   #0a130d;   /* custom near-black green */
+	--color-surface-2: #111c14;   /* custom dark green */
+	--color-surface-3: #1a2e1e;   /* custom mid green */
+	--color-muted:     #6b9a77;   /* custom muted green */
+	--color-text:      #e8f5e9;   /* custom light green-tinted white */
+	--color-border:    #1e3a24;   /* custom green border */
+	--color-danger:    #f87171;   /* red-400 */
+	--color-success:   #4ade80;   /* green-400 */
+}
+
+/* ── Mono theme — pure dark with white accent ─────────────────────────── */
+[data-theme="mono"] {
+	--color-brand:     #f4f4f5;   /* zinc-100 — white accent */
+	--color-brand-dim: #a1a1aa;   /* zinc-400 */
+	--color-surface:   #09090b;   /* zinc-950 */
+	--color-surface-2: #18181b;   /* zinc-900 */
+	--color-surface-3: #27272a;   /* zinc-800 */
+	--color-muted:     #71717a;   /* zinc-500 */
+	--color-text:      #f4f4f5;   /* zinc-100 */
+	--color-border:    #27272a;   /* zinc-800 */
+	--color-danger:    #f87171;   /* red-400 */
+	--color-success:   #4ade80;   /* green-400 */
+}
+
+/* ── Cyberpunk theme — dark with neon cyan/magenta accents ────────────── */
+[data-theme="cyber"] {
+	--color-brand:     #22d3ee;   /* cyan-400 — neon cyan */
+	--color-brand-dim: #06b6d4;   /* cyan-500 */
+	--color-surface:   #050712;   /* custom near-black blue */
+	--color-surface-2: #0d1117;   /* custom dark blue-black */
+	--color-surface-3: #161b27;   /* custom dark blue */
+	--color-muted:     #6272a4;   /* dracula comment blue */
+	--color-text:      #e2e8f0;   /* slate-200 */
+	--color-border:    #1e2d45;   /* custom dark border */
+	--color-danger:    #ff5555;   /* dracula red */
+	--color-success:   #50fa7b;   /* dracula green */
+}
+
 html {
 	background-color: var(--color-surface);
 	color: var(--color-text);

ui/src/routes/+layout.svelte

@@ -38,6 +38,9 @@
 		{ id: 'amber',       color: '#f59e0b' },
 		{ id: 'slate',       color: '#818cf8' },
 		{ id: 'rose',        color: '#fb7185' },
+		{ id: 'forest',      color: '#4ade80' },
+		{ id: 'mono',        color: '#f4f4f5' },
+		{ id: 'cyber',       color: '#22d3ee' },
 		{ id: 'light',       color: '#d97706', light: true },
 		{ id: 'light-slate', color: '#4f46e5', light: true },
 		{ id: 'light-rose',  color: '#e11d48', light: true },

ui/src/routes/profile/+page.svelte

@@ -145,6 +145,9 @@
 		{ id: 'amber',       label: () => m.profile_theme_amber(),       swatch: '#f59e0b' },
 		{ id: 'slate',       label: () => m.profile_theme_slate(),       swatch: '#818cf8' },
 		{ id: 'rose',        label: () => m.profile_theme_rose(),        swatch: '#fb7185' },
+		{ id: 'forest',      label: () => m.profile_theme_forest(),      swatch: '#4ade80' },
+		{ id: 'mono',        label: () => m.profile_theme_mono(),        swatch: '#f4f4f5' },
+		{ id: 'cyber',       label: () => m.profile_theme_cyber(),       swatch: '#22d3ee' },
 		{ id: 'light',       label: () => m.profile_theme_light(),       swatch: '#d97706', light: true },
 		{ id: 'light-slate', label: () => m.profile_theme_light_slate(), swatch: '#4f46e5', light: true },
 		{ id: 'light-rose',  label: () => m.profile_theme_light_rose(),  swatch: '#e11d48', light: true },