theme: add Warp terminal theme support (#42)

* theme: add Warp terminal theme support

Add support for Warp terminal theming with proper template and integration.
- Add warp.yaml template with standard theme variables
- Implement apply_warp function with correct 'darker'/'lighter' values
- Integrate with main theme application pipeline via enableWarp config

* warp: improve theme generation and use proper data directory

- Use gen_replace with hash=True for consistent color formatting
- Remove # symbols from template to avoid double hashes
- Replace warp_mode manually after gen_replace instead of adding to colors dict
- Use data_dir for XDG-compliant theme location

src/caelestia/data/templates/warp.yaml

@@ -0,0 +1,26 @@
+---
+name: 'Caelestia Theme'
+accent: '{{ $primary }}'
+background: '{{ $surface }}'
+foreground: '{{ $onSurface }}'
+details: {{ $warp_mode }}
+cursor: '{{ $secondary }}'
+terminal_colors:
+  normal:
+    black: '{{ $term0 }}'
+    red: '{{ $term1 }}'
+    green: '{{ $term2 }}'
+    yellow: '{{ $term3 }}'
+    blue: '{{ $term4 }}'
+    magenta: '{{ $term5 }}'
+    cyan: '{{ $term6 }}'
+    white: '{{ $term7 }}'
+  bright:
+    black: '{{ $term8 }}'
+    red: '{{ $term9 }}'
+    green: '{{ $term10 }}'
+    yellow: '{{ $term11 }}'
+    blue: '{{ $term12 }}'
+    magenta: '{{ $term13 }}'
+    cyan: '{{ $term14 }}'
+    white: '{{ $term15 }}'