feat: add streamer mode for privacy during streaming

- Add quick toggle button in InputBar for easy access
- Mask API keys in settings when streamer mode active
- Optional path masking to hide usernames in file paths
- Visual LIVE indicator in both InputBar and StatusBar
- Keyboard shortcut Ctrl+Shift+S for quick toggle
- Privacy section in settings for additional options

Closes #35

src-tauri/src/config.rs

@@ -73,6 +73,12 @@ pub struct HikariConfig {
 
     #[serde(default)]
     pub minimize_to_tray: bool,
+
+    #[serde(default)]
+    pub streamer_mode: bool,
+
+    #[serde(default)]
+    pub streamer_hide_paths: bool,
 }
 
 impl Default for HikariConfig {
@@ -93,6 +99,8 @@ impl Default for HikariConfig {
             character_panel_width: None,
             font_size: 14,
             minimize_to_tray: false,
+            streamer_mode: false,
+            streamer_hide_paths: false,
         }
     }
 }
@@ -147,6 +155,8 @@ mod tests {
         assert!(config.character_panel_width.is_none());
         assert_eq!(config.font_size, 14);
         assert!(!config.minimize_to_tray);
+        assert!(!config.streamer_mode);
+        assert!(!config.streamer_hide_paths);
     }
 
     #[test]