feat: add user profile with avatar, bio, and lifetime stats

- Add profile fields to HikariConfig (name, avatar path, bio)
- Create ProfilePanel component with trans-pride themed styling
- Add profile button to StatusBar for easy access
- Display lifetime stats (messages, tokens, code blocks, files, cost)
- Show achievement completion progress bar
- Support file picker for avatar image selection
- Remove global stats from StatsDisplay (now in Profile)

Co-Authored-By: Hikari <hikari@nhcarrigan.com>

src-tauri/src/config.rs

@@ -82,6 +82,16 @@ pub struct HikariConfig {
 
     #[serde(default)]
     pub compact_mode: bool,
+
+    // Profile fields
+    #[serde(default)]
+    pub profile_name: Option<String>,
+
+    #[serde(default)]
+    pub profile_avatar_path: Option<String>,
+
+    #[serde(default)]
+    pub profile_bio: Option<String>,
 }
 
 impl Default for HikariConfig {
@@ -105,6 +115,9 @@ impl Default for HikariConfig {
             streamer_mode: false,
             streamer_hide_paths: false,
             compact_mode: false,
+            profile_name: None,
+            profile_avatar_path: None,
+            profile_bio: None,
         }
     }
 }
@@ -162,6 +175,9 @@ mod tests {
         assert!(!config.streamer_mode);
         assert!(!config.streamer_hide_paths);
         assert!(!config.compact_mode);
+        assert!(config.profile_name.is_none());
+        assert!(config.profile_avatar_path.is_none());
+        assert!(config.profile_bio.is_none());
     }
 
     #[test]
@@ -185,6 +201,9 @@ mod tests {
             streamer_mode: false,
             streamer_hide_paths: false,
             compact_mode: false,
+            profile_name: Some("Test User".to_string()),
+            profile_avatar_path: None,
+            profile_bio: Some("A test bio".to_string()),
         };
 
         let json = serde_json::to_string(&config).unwrap();