MAESTRO: Fix screenshots.md documentation inaccuracies

- Updated theme count from 12 to 18 in description
- Added 4 missing light themes: Solarized, One Light, Gruvbox Light, Catppuccin Latte
- Fixed "GitHub Light" to "GitHub" to match actual theme name
- Fixed Settings path from "Appearance → Theme" to "Themes tab"
- Added Custom Theme section documenting the theme builder

docs/screenshots.md

@@ -1,10 +1,10 @@
 ---
 title: Themes Gallery
-description: Preview Maestro's beautiful themes including Dracula, Nord, Tokyo Night, and custom Vibe themes.
+description: Preview Maestro's 18 beautiful themes including Dracula, Nord, Tokyo Night, and custom Vibe themes.
 icon: palette
 ---
 
-Maestro ships with carefully crafted themes across three categories. Screenshots below show each theme in action.
+Maestro ships with 18 carefully crafted themes across three categories, plus a Custom theme builder. Screenshots below show each theme in action.
 
 ## Available Themes
 For a screenshot example of every option, see [THEMES.md](https://github.com/pedramamini/Maestro/blob/main/THEMES.md) on GitHub. You can also flip through the available themes at [RunMaestro.ai](https://runmaestro.ai).
@@ -20,7 +20,11 @@ For a screenshot example of every option, see [THEMES.md](https://github.com/ped
 - **Gruvbox Dark** — Retro groove with warm earth tones
 
 ### Light Themes
-- **GitHub Light** — GitHub's clean light mode
+- **GitHub** — GitHub's clean light mode
+- **Solarized** — Precision colors for readability
+- **One Light** — Atom's light theme with magenta accents
+- **Gruvbox Light** — Retro groove in light mode
+- **Catppuccin Latte** — Soothing pastel light theme
 - **Ayu Light** — Bright, modern light theme
 
 ### Vibe Themes
@@ -30,6 +34,9 @@ Custom themes with unique personality:
 - **Dre Synth** — Cyberpunk cyan and magenta
 - **InQuest** — Minimal black with crimson accents
 
+### Custom Theme
+Build your own theme using the Custom Theme Builder with import/export support.
+
 ## Changing Themes
 
 1. Press `Cmd+K` (Mac) or `Ctrl+K` (Windows/Linux)
@@ -37,4 +44,4 @@ Custom themes with unique personality:
 3. Use arrow keys to preview themes live
 4. Press `Enter` to apply
 
-Or go to **Settings** (`Cmd+,`) → **Appearance** → **Theme**.
+Or go to **Settings** (`Cmd+,`) → **Themes** tab.