feat: add minimize to system tray option

Add ability to minimize Hikari to the system tray when closing the window
instead of fully exiting. When enabled, clicking the close button hides
the window and shows a tray icon with "Show Hikari" and "Quit" options.

- Add tray module with system tray setup and menu handling
- Add minimize_to_tray config option in settings
- Handle window close event to hide instead of close when enabled
- Add tray icon click handler to restore window

src-tauri/Cargo.lock

@@ -4180,6 +4180,7 @@ dependencies = [
  "gtk",
  "heck 0.5.0",
  "http",
+ "image",
  "jni",
  "libc",
  "log",

src-tauri/Cargo.toml

@@ -13,7 +13,7 @@ crate-type = ["staticlib", "cdylib", "rlib"]
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
-tauri = { version = "2", features = [] }
+tauri = { version = "2", features = ["tray-icon", "image-png"] }
 tauri-plugin-dialog = "2"
 tauri-plugin-opener = "2"
 tauri-plugin-shell = "2"

src-tauri/capabilities/default.json

@@ -15,6 +15,7 @@
     "notification:allow-request-permission",
     "notification:allow-notify",
     "clipboard-manager:default",
-    "clipboard-manager:allow-read-image"
+    "clipboard-manager:allow-read-image",
+    "core:tray:default"
   ]
 }

src-tauri/src/config.rs

@@ -70,6 +70,9 @@ pub struct HikariConfig {
 
     #[serde(default = "default_font_size")]
     pub font_size: u32,
+
+    #[serde(default)]
+    pub minimize_to_tray: bool,
 }
 
 impl Default for HikariConfig {
@@ -89,6 +92,7 @@ impl Default for HikariConfig {
             update_checks_enabled: true,
             character_panel_width: None,
             font_size: 14,
+            minimize_to_tray: false,
         }
     }
 }
@@ -140,6 +144,7 @@ mod tests {
         assert!(config.update_checks_enabled);
         assert!(config.character_panel_width.is_none());
         assert_eq!(config.font_size, 14);
+        assert!(!config.minimize_to_tray);
     }
 
     #[test]
@@ -159,6 +164,7 @@ mod tests {
             update_checks_enabled: true,
             character_panel_width: Some(400),
             font_size: 16,
+            minimize_to_tray: true,
         };
 
         let json = serde_json::to_string(&config).unwrap();

src-tauri/src/lib.rs

@@ -5,6 +5,7 @@ mod config;
 mod notifications;
 mod stats;
 mod temp_manager;
+mod tray;
 mod types;
 mod vbs_notification;
 mod windows_toast;
@@ -15,7 +16,9 @@ use bridge_manager::create_shared_bridge_manager;
 use commands::load_saved_achievements;
 use commands::*;
 use notifications::*;
+use tauri::Manager;
 use temp_manager::create_shared_temp_manager;
+use tray::{setup_tray, should_minimize_to_tray};
 use vbs_notification::*;
 use windows_toast::*;
 use wsl_notifications::*;
@@ -47,6 +50,27 @@ pub fn run() {
                 }
             }
 
+            // Set up system tray
+            if let Err(e) = setup_tray(app.handle()) {
+                eprintln!("Failed to set up system tray: {}", e);
+            }
+
+            // Handle window close event for minimize to tray
+            let main_window = app.get_webview_window("main").unwrap();
+            main_window.on_window_event({
+                let app_handle = app.handle().clone();
+                move |event| {
+                    if let tauri::WindowEvent::CloseRequested { api, .. } = event {
+                        if should_minimize_to_tray(&app_handle) {
+                            api.prevent_close();
+                            if let Some(window) = app_handle.get_webview_window("main") {
+                                let _ = window.hide();
+                            }
+                        }
+                    }
+                }
+            });
+
             Ok(())
         })
         .invoke_handler(tauri::generate_handler![

src-tauri/src/tray.rs

@@ -0,0 +1,68 @@
+use tauri::{
+    menu::{Menu, MenuItem},
+    tray::{MouseButton, MouseButtonState, TrayIconBuilder, TrayIconEvent},
+    AppHandle, Manager,
+};
+
+use crate::config::HikariConfig;
+
+pub fn setup_tray(app: &AppHandle) -> tauri::Result<()> {
+    let show_item = MenuItem::with_id(app, "show", "Show Hikari", true, None::<&str>)?;
+    let quit_item = MenuItem::with_id(app, "quit", "Quit", true, None::<&str>)?;
+
+    let menu = Menu::with_items(app, &[&show_item, &quit_item])?;
+
+    let _tray = TrayIconBuilder::with_id("main")
+        .icon(app.default_window_icon().unwrap().clone())
+        .menu(&menu)
+        .tooltip("Hikari - Claude Code Assistant")
+        .on_menu_event(|app, event| match event.id.as_ref() {
+            "show" => {
+                if let Some(window) = app.get_webview_window("main") {
+                    let _ = window.show();
+                    let _ = window.unminimize();
+                    let _ = window.set_focus();
+                }
+            }
+            "quit" => {
+                app.exit(0);
+            }
+            _ => {}
+        })
+        .on_tray_icon_event(|tray, event| {
+            if let TrayIconEvent::Click {
+                button: MouseButton::Left,
+                button_state: MouseButtonState::Up,
+                ..
+            } = event
+            {
+                let app = tray.app_handle();
+                if let Some(window) = app.get_webview_window("main") {
+                    let _ = window.show();
+                    let _ = window.unminimize();
+                    let _ = window.set_focus();
+                }
+            }
+        })
+        .build(app)?;
+
+    Ok(())
+}
+
+pub fn should_minimize_to_tray(app: &AppHandle) -> bool {
+    let config_path = app
+        .path()
+        .app_config_dir()
+        .ok()
+        .map(|p| p.join("hikari-config.json"));
+
+    if let Some(path) = config_path {
+        if let Ok(content) = std::fs::read_to_string(&path) {
+            if let Ok(config) = serde_json::from_str::<HikariConfig>(&content) {
+                return config.minimize_to_tray;
+            }
+        }
+    }
+
+    false
+}

src-tauri/tauri.conf.json

@@ -22,6 +22,12 @@
     ],
     "security": {
       "csp": null
+    },
+    "trayIcon": {
+      "id": "main",
+      "iconPath": "icons/32x32.png",
+      "iconAsTemplate": false,
+      "tooltip": "Hikari - Claude Code Assistant"
     }
   },
   "bundle": {

src/lib/components/ConfigSidebar.svelte

@@ -23,6 +23,7 @@
     notifications_enabled: true,
     notification_volume: 0.7,
     always_on_top: false,
+    minimize_to_tray: false,
     update_checks_enabled: true,
     character_panel_width: null,
     font_size: 14,
@@ -477,6 +478,21 @@
         </p>
       </div>
 
+      <!-- Minimize to Tray Toggle -->
+      <div class="mb-4">
+        <label class="flex items-center gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            bind:checked={config.minimize_to_tray}
+            class="w-4 h-4 text-[var(--accent-primary)] bg-[var(--bg-primary)] border-[var(--border-color)] rounded focus:ring-[var(--accent-primary)] focus:ring-2"
+          />
+          <span class="text-sm text-[var(--text-primary)]">Minimize to system tray</span>
+        </label>
+        <p class="text-xs text-[var(--text-tertiary)] mt-1 ml-7">
+          Hide to tray instead of closing when you click the X button
+        </p>
+      </div>
+
       <!-- Update Checks Toggle -->
       <div class="mb-4">
         <label class="flex items-center gap-3 cursor-pointer">

src/lib/components/StatusBar.svelte

@@ -49,6 +49,7 @@
     update_checks_enabled: true,
     character_panel_width: null,
     font_size: 14,
+    minimize_to_tray: false,
   });
 
   onMount(async () => {

src/lib/stores/config.ts

@@ -15,6 +15,7 @@ export interface HikariConfig {
   notifications_enabled: boolean;
   notification_volume: number;
   always_on_top: boolean;
+  minimize_to_tray: boolean;
   update_checks_enabled: boolean;
   character_panel_width: number | null;
   font_size: number;
@@ -32,6 +33,7 @@ const defaultConfig: HikariConfig = {
   notifications_enabled: true,
   notification_volume: 0.7,
   always_on_top: false,
+  minimize_to_tray: false,
   update_checks_enabled: true,
   character_panel_width: null,
   font_size: 14,