fix(docs): update theme screenshots and add missing themes

docs/cli/themes.md

@@ -16,6 +16,8 @@ using the `/theme` command within Gemini CLI:
   - `Default`
   - `Dracula`
   - `GitHub`
+  - `Holiday`
+  - `Shades Of Purple`
   - `Solarized Dark`
 - **Light themes:**
   - `ANSI Light`
@@ -212,27 +214,35 @@ identify their source, for example: `shades-of-green (green-extension)`.
 
 ### ANSI
 
-<img src="/assets/theme-ansi.png" alt="ANSI theme" width="600" />
+<img src="/assets/theme-ansi-dark.png" alt="ANSI theme" width="600">
 
-### Atom OneDark
+### Atom One
 
-<img src="/assets/theme-atom-one.png" alt="Atom One theme" width="600">
+<img src="/assets/theme-atom-one-dark.png" alt="Atom One theme" width="600">
 
 ### Ayu
 
-<img src="/assets/theme-ayu.png" alt="Ayu theme" width="600">
+<img src="/assets/theme-ayu-dark.png" alt="Ayu theme" width="600">
 
 ### Default
 
-<img src="/assets/theme-default.png" alt="Default theme" width="600">
+<img src="/assets/theme-default-dark.png" alt="Default theme" width="600">
 
 ### Dracula
 
-<img src="/assets/theme-dracula.png" alt="Dracula theme" width="600">
+<img src="/assets/theme-dracula-dark.png" alt="Dracula theme" width="600">
 
 ### GitHub
 
-<img src="/assets/theme-github.png" alt="GitHub theme" width="600">
+<img src="/assets/theme-github-dark.png" alt="GitHub theme" width="600">
+
+### Holiday
+
+<img src="/assets/theme-holiday-dark.png" alt="Holiday theme" width="600">
+
+### Shades Of Purple
+
+<img src="/assets/theme-shades-of-purple-dark.png" alt="Shades Of Purple theme" width="600">
 
 ### Solarized Dark