feat: add Neon Noir theme preset (#401)

Add a new NEON_NOIR theme preset with dark cyberpunk-pink aesthetic:
- Deep Void (#0f0b1a) background with Slay Pink (#ff6bf4) primary
- Full dark + light color schemes with proper contrast ratios
- Custom status colors matching the neon aesthetic
- UI dropdown entry and string resource

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/res/values/strings.xml

@@ -172,6 +172,7 @@
     <string name="theme_preset_gruvbox">Gruvbox</string>
     <string name="theme_preset_catppuccin">Catppuccin</string>
     <string name="theme_preset_amoled">AMOLED Black (Dark only)</string>
+    <string name="theme_preset_neon_noir">Neon Noir</string>
 
     <!-- Connect Screen -->
     <string name="connect_selected_profile">Profile: %1$s</string>