feat: implement empty folder functionality for junk and trash mailboxes with confirmation dialog

stores/email-store.ts

@@ -102,6 +102,7 @@ interface EmailStore {
   renameMailbox: (client: JMAPClient, mailboxId: string, name: string) => Promise<void>;
   deleteMailbox: (client: JMAPClient, mailboxId: string) => Promise<void>;
   setMailboxRole: (client: JMAPClient, mailboxId: string, role: string | null) => Promise<void>;
+  emptyMailbox: (client: JMAPClient, mailboxId: string) => Promise<void>;
 
   // Mock data for demo
   loadMockData: () => void;
@@ -411,6 +412,7 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
 
       // Get delete action preference from settings
       const deleteAction = useSettingsStore.getState().deleteAction;
+      const permanentlyDeleteJunk = useSettingsStore.getState().permanentlyDeleteJunk;
 
       // Determine accountId for shared folders
       const selectedMailboxId = get().selectedMailbox;
@@ -418,6 +420,12 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
       const currentMailbox = mailboxes.find(mb => mb.id === selectedMailboxId);
       const accountId = currentMailbox?.isShared ? currentMailbox.accountId : undefined;
 
+      // If in junk folder and setting is enabled, permanently delete
+      const isInJunk = currentMailbox?.role === 'junk';
+      if (isInJunk && permanentlyDeleteJunk) {
+        forceDelete = true;
+      }
+
       // If deleteAction is 'trash' and not forced permanent delete, try to move to trash mailbox
       if (deleteAction === 'trash' && !forceDelete) {
         // Find trash mailbox for the correct account
@@ -1287,6 +1295,35 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
     }
   },
 
+  emptyMailbox: async (client, mailboxId) => {
+    try {
+      set({ isLoading: true, error: null });
+      await client.emptyMailbox(mailboxId);
+
+      // Clear emails from local state if we're viewing this mailbox
+      const currentMailbox = get().selectedMailbox;
+      if (currentMailbox === mailboxId) {
+        set({ emails: [], selectedEmail: null });
+      }
+
+      // Update mailbox counters
+      set({
+        mailboxes: get().mailboxes.map(mb =>
+          mb.id === mailboxId
+            ? { ...mb, totalEmails: 0, unreadEmails: 0, totalThreads: 0, unreadThreads: 0 }
+            : mb
+        ),
+        isLoading: false,
+      });
+    } catch (error) {
+      set({
+        error: error instanceof Error ? error.message : 'Failed to empty folder',
+        isLoading: false,
+      });
+      throw error;
+    }
+  },
+
   loadMockData: () => {
     const mockEmails: Email[] = [
       {

stores/settings-store.ts

@@ -77,6 +77,7 @@ interface SettingsState {
   // Email Behavior
   markAsReadDelay: number; // milliseconds (0 = instant, -1 = never)
   deleteAction: DeleteAction;
+  permanentlyDeleteJunk: boolean; // Permanently delete emails from junk/spam instead of moving to trash
   showPreview: boolean;
   emailsPerPage: number;
   externalContentPolicy: ExternalContentPolicy;
@@ -154,6 +155,7 @@ const DEFAULT_SETTINGS = {
   // Email Behavior
   markAsReadDelay: 0, // Instant
   deleteAction: 'trash' as DeleteAction,
+  permanentlyDeleteJunk: false,
   showPreview: true,
   emailsPerPage: 50,
   externalContentPolicy: 'ask' as ExternalContentPolicy,