Add profile deletion feature

- Added DELETE endpoint /api/profiles/<profile_name> to delete profiles
- Prevent deletion of the only remaining profile
- Clear current profile state if the active profile is deleted
- Added Delete button next to each profile in the Profiles modal
- Added confirmation dialog before deleting profiles
- Automatically refresh profile list after deletion

settings.json

@@ -1,6 +1,6 @@
 {
     "tab_password": "",
-    "current_profile": "tt",
+    "current_profile": "default",
     "patterns": {
         "on": {
             "min_delay": 10,
@@ -46,5 +46,9 @@
             "min_delay": 10,
             "max_delay": 10000
         }
-    }
+    },
+    "color_palette": [
+        "#c12525",
+        "#246dcc"
+    ]
 }