feat: skip server-managed vacation script in Sieve script handling

stores/__tests__/filter-store.test.ts

@@ -339,5 +339,39 @@ describe('filter-store', () => {
       await useFilterStore.getState().fetchFilters(mockClient as unknown as IJMAPClient);
       expect(useFilterStore.getState().rawScript).toBe(script);
     });
+
+    it('should skip the server-managed vacation script', async () => {
+      const { generateScript } = await import('@/lib/sieve/generator');
+      const rules = [makeRule({ name: 'MyFilter' })];
+      const script = generateScript(rules);
+
+      const mockClient = {
+        getSieveCapabilities: () => null,
+        getSieveScripts: async () => [
+          { id: 'vac-1', name: 'vacation', blobId: 'bv', isActive: true },
+          { id: 's1', name: 'filters', blobId: 'b1', isActive: false },
+        ],
+        getSieveScriptContent: async (blobId: string) => {
+          if (blobId === 'b1') return script;
+          return 'require "vacation"; vacation "I am away";';
+        },
+      };
+      await useFilterStore.getState().fetchFilters(mockClient as unknown as IJMAPClient);
+      // Should pick the 'filters' script, not the 'vacation' one
+      expect(useFilterStore.getState().activeScriptId).toBe('s1');
+      expect(useFilterStore.getState().rules[0].name).toBe('MyFilter');
+    });
+
+    it('should handle only vacation script present (no filter scripts)', async () => {
+      const mockClient = {
+        getSieveCapabilities: () => null,
+        getSieveScripts: async () => [
+          { id: 'vac-1', name: 'vacation', blobId: 'bv', isActive: true },
+        ],
+      };
+      await useFilterStore.getState().fetchFilters(mockClient as unknown as IJMAPClient);
+      expect(useFilterStore.getState().activeScriptId).toBeNull();
+      expect(useFilterStore.getState().rules).toEqual([]);
+    });
   });
 });

stores/filter-store.ts

@@ -52,8 +52,12 @@ export const useFilterStore = create<FilterStore>()((set, get) => ({
       const capabilities = client.getSieveCapabilities();
       set({ sieveCapabilities: capabilities });
 
-      const scripts = await client.getSieveScripts();
+      const allScripts = await client.getSieveScripts();
-      debug.log('Sieve scripts fetched:', scripts.length);
+      debug.log('Sieve scripts fetched:', allScripts.length);
+
+      // Skip the server-managed 'vacation' script (RFC 9661 §4) — it can only
+      // be modified via VacationResponse/set, not SieveScript/set.
+      const scripts = allScripts.filter(s => s.name !== 'vacation');
 
       const activeScript = scripts.find(s => s.isActive) || scripts[0];
       if (!activeScript) {
@@ -163,7 +167,9 @@ export const useFilterStore = create<FilterStore>()((set, get) => ({
 
       // Always re-fetch scripts from the server to get the current state
       // after Stalwart may have rewritten the active script.
-      const scripts = await client.getSieveScripts();
+      const allScripts = await client.getSieveScripts();
+      // Skip the server-managed 'vacation' script (RFC 9661 §4)
+      const scripts = allScripts.filter(s => s.name !== 'vacation');
       const activeScript = scripts.find(s => s.isActive) || scripts[0];
 
       let rules = previousRules;