theme: add zed editor theme support (#102)

- Add Zed theme template (zed.json) with full Material You syntax
  highlighting, UI colors, and terminal ANSI palette
- Apply theme via file overwrite instead of restarting Zed, so
  Zed's file watcher picks up changes automatically
- Resolve symlinks in apply_zed() only before writing, since
  Zed's file watcher does not detect changes through symlinks
  (other themed apps that rely on symlinks are unaffected)

src/caelestia/utils/theme.py

@@ -339,6 +339,18 @@ def apply_warp(colours: dict[str, str], mode: str) -> None:
     write_file(data_dir / "warp-terminal/themes/caelestia.yaml", template)
 
 
+@log_exception
+def apply_zed(colours: dict[str, str], mode: str) -> None:
+    theme_path = config_dir / "zed/themes/caelestia.json"
+    # Zed's file watcher does not detect changes through symlinks,
+    # so resolve to a regular file before writing
+    if theme_path.is_symlink():
+        theme_path.unlink()
+
+    content = gen_replace_dynamic(colours, templates_dir / "zed.json", mode)
+    write_file(theme_path, content)
+
+
 @log_exception
 def apply_cava(colours: dict[str, str]) -> None:
     template = gen_replace(colours, templates_dir / "cava.conf", hash=True)
@@ -401,6 +413,8 @@ def apply_colours(colours: dict[str, str], mode: str) -> None:
                 apply_qt(colours, mode)
             if check("enableWarp"):
                 apply_warp(colours, mode)
+            if check("enableZed"):
+                apply_zed(colours, mode)
             if check("enableCava"):
                 apply_cava(colours)
             apply_user_templates(colours, mode)