refactor: Vue 3 state, TypeScript, and lifecycle improvements

- connectionsByGroup memoized as computed map — eliminates redundant filter on every render
- DockerPanel: replace any[] with typed DockerContainer/Image/Volume interfaces
- useRdp: replace ReturnType<typeof ref<boolean>> with Ref<boolean>
- SettingsModal: debounce sidebarWidth slider watch (300ms) to prevent rapid IPC calls
- useSftp: export cleanupSession() to prevent sessionPaths memory leak
- StatusBar, CommandPalette: migrate defineEmits to Vue 3.3+ tuple syntax
- SidebarToggle: replace manual v-model (defineProps + defineEmits) with defineModel

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/common/CommandPalette.vue

@@ -116,9 +116,9 @@ const connectionStore = useConnectionStore();
 const sessionStore = useSessionStore();
 
 const emit = defineEmits<{
-  (e: "open-import"): void;
-  (e: "open-settings"): void;
-  (e: "open-new-connection", protocol?: "ssh" | "rdp"): void;
+  "open-import": [];
+  "open-settings": [];
+  "open-new-connection": [protocol?: "ssh" | "rdp"];
 }>();
 
 const actions: PaletteAction[] = [

src/components/common/SettingsModal.vue

@@ -422,9 +422,16 @@ watch(
   () => settings.value.defaultProtocol,
   (val) => invoke("set_setting", { key: "default_protocol", value: val }).catch(console.error),
 );
+let sidebarWidthDebounce: ReturnType<typeof setTimeout>;
 watch(
   () => settings.value.sidebarWidth,
-  (val) => invoke("set_setting", { key: "sidebar_width", value: String(val) }).catch(console.error),
+  (val) => {
+    clearTimeout(sidebarWidthDebounce);
+    sidebarWidthDebounce = setTimeout(
+      () => invoke("set_setting", { key: "sidebar_width", value: String(val) }).catch(console.error),
+      300,
+    );
+  },
 );
 watch(
   () => settings.value.terminalTheme,

src/components/common/StatusBar.vue

@@ -47,7 +47,7 @@ const connectionStore = useConnectionStore();
 const activeThemeName = ref("Default");
 
 const emit = defineEmits<{
-  (e: "open-theme-picker"): void;
+  "open-theme-picker": [];
 }>();
 
 const connectionInfo = computed(() => {

src/components/sidebar/SidebarToggle.vue

@@ -5,11 +5,11 @@
       :key="tab.id"
       class="flex-1 py-2 text-xs font-medium text-center transition-colors cursor-pointer"
       :class="
-        modelValue === tab.id
+        model === tab.id
           ? 'text-[var(--wraith-accent-blue)] border-b-2 border-[var(--wraith-accent-blue)]'
           : 'text-[var(--wraith-text-muted)] hover:text-[var(--wraith-text-secondary)]'
       "
-      @click="emit('update:modelValue', tab.id)"
+      @click="model = tab.id"
     >
       {{ tab.label }}
     </button>
@@ -24,11 +24,5 @@ const tabs = [
   { id: "sftp" as const, label: "SFTP" },
 ];
 
-defineProps<{
-  modelValue: SidebarTab;
-}>();
-
-const emit = defineEmits<{
-  "update:modelValue": [tab: SidebarTab];
-}>();
+const model = defineModel<SidebarTab>();
 </script>

src/components/tools/DockerPanel.vue

@@ -81,12 +81,16 @@
 import { ref, onMounted } from "vue";
 import { invoke } from "@tauri-apps/api/core";
 
+interface DockerContainer { id: string; name: string; image: string; status: string; ports: string; }
+interface DockerImage { repository: string; tag: string; id: string; size: string; }
+interface DockerVolume { name: string; driver: string; mountpoint: string; }
+
 const props = defineProps<{ sessionId: string }>();
 
 const tab = ref("containers");
-const containers = ref<any[]>([]);
-const images = ref<any[]>([]);
-const volumes = ref<any[]>([]);
+const containers = ref<DockerContainer[]>([]);
+const images = ref<DockerImage[]>([]);
+const volumes = ref<DockerVolume[]>([]);
 const output = ref("");
 
 async function refresh(): Promise<void> {

src/composables/useRdp.ts

@@ -1,4 +1,5 @@
 import { ref, onBeforeUnmount } from "vue";
+import type { Ref } from "vue";
 import { invoke } from "@tauri-apps/api/core";
 
 /**
@@ -152,11 +153,11 @@ export function jsKeyToScancode(code: string): number | null {
 
 export interface UseRdpReturn {
   /** Whether the RDP session is connected (first frame received) */
-  connected: ReturnType<typeof ref<boolean>>;
+  connected: Ref<boolean>;
   /** Whether keyboard capture is enabled */
-  keyboardGrabbed: ReturnType<typeof ref<boolean>>;
+  keyboardGrabbed: Ref<boolean>;
   /** Whether clipboard sync is enabled */
-  clipboardSync: ReturnType<typeof ref<boolean>>;
+  clipboardSync: Ref<boolean>;
   /** Fetch the current frame as RGBA ImageData */
   fetchFrame: (sessionId: string, width: number, height: number) => Promise<ImageData | null>;
   /** Send a mouse event to the backend */

src/composables/useSftp.ts

@@ -24,6 +24,11 @@ export interface UseSftpReturn {
 // Persist the last browsed path per session so switching tabs restores position
 const sessionPaths: Record<string, string> = {};
 
+/** Remove a session's saved path from the module-level cache. Call on session close. */
+export function cleanupSession(sessionId: string): void {
+  delete sessionPaths[sessionId];
+}
+
 /**
  * Composable that manages SFTP file browsing state.
  * Accepts a reactive session ID ref so it reinitializes on tab switch

src/stores/connection.store.ts

@@ -51,22 +51,33 @@ export const useConnectionStore = defineStore("connection", () => {
     );
   });
 
+  /** Memoized map of groupId → filtered connections. Recomputes only when connections or searchQuery change. */
+  const connectionsByGroupMap = computed<Record<number, Connection[]>>(() => {
+    const q = searchQuery.value.toLowerCase().trim();
+    const map: Record<number, Connection[]> = {};
+    for (const c of connections.value) {
+      if (c.groupId === null) continue;
+      if (q) {
+        const match =
+          c.name.toLowerCase().includes(q) ||
+          c.hostname.toLowerCase().includes(q) ||
+          c.tags?.some((t) => t.toLowerCase().includes(q));
+        if (!match) continue;
+      }
+      if (!map[c.groupId]) map[c.groupId] = [];
+      map[c.groupId].push(c);
+    }
+    return map;
+  });
+
   /** Get connections belonging to a specific group. */
   function connectionsByGroup(groupId: number): Connection[] {
-    const q = searchQuery.value.toLowerCase().trim();
-    const groupConns = connections.value.filter((c) => c.groupId === groupId);
-    if (!q) return groupConns;
-    return groupConns.filter(
-      (c) =>
-        c.name.toLowerCase().includes(q) ||
-        c.hostname.toLowerCase().includes(q) ||
-        c.tags?.some((t) => t.toLowerCase().includes(q)),
-    );
+    return connectionsByGroupMap.value[groupId] ?? [];
   }
 
   /** Check if a group has any matching connections (for search filtering). */
   function groupHasResults(groupId: number): boolean {
-    return connectionsByGroup(groupId).length > 0;
+    return (connectionsByGroupMap.value[groupId]?.length ?? 0) > 0;
   }
 
   /** Load connections from the Rust backend. */
@@ -101,6 +112,7 @@ export const useConnectionStore = defineStore("connection", () => {
     groups,
     searchQuery,
     filteredConnections,
+    connectionsByGroupMap,
     connectionsByGroup,
     groupHasResults,
     loadConnections,