feat: enhance EventFightList with grouping and selection features

- Added grouping functionality to the EventFightList component, allowing fights to be grouped by their associated group.
- Implemented row selection with checkboxes for both individual fights and groups, enabling bulk selection.
- Updated columns definition to include a checkbox for selecting all rows and individual row selection checkboxes.
- Modified the checkbox component to support indeterminate state and improved styling.
- Enhanced date formatting for fight start times in the table.

components.json

@@ -1,17 +1,17 @@
 {
-    "$schema": "https://shadcn-svelte.com/schema.json",
-    "style": "default",
-    "tailwind": {
-        "config": "tailwind.config.js",
-        "css": "src\\styles\\app.css",
-        "baseColor": "slate"
-    },
-    "aliases": {
-        "components": "$lib/components",
-        "utils": "$lib/components/utils",
-        "ui": "$lib/components/ui",
-        "hooks": "$lib/hooks"
-    },
-    "typescript": true,
-    "registry": "https://next.shadcn-svelte.com/registry"
+	"$schema": "https://shadcn-svelte.com/schema.json",
+	"style": "default",
+	"tailwind": {
+		"config": "tailwind.config.js",
+		"css": "src\\styles\\app.css",
+		"baseColor": "slate"
+	},
+	"aliases": {
+		"components": "$lib/components",
+		"utils": "$lib/components/utils",
+		"ui": "$lib/components/ui",
+		"hooks": "$lib/hooks"
+	},
+	"typescript": true,
+	"registry": "https://next.shadcn-svelte.com/registry"
 }