perf: preload events and CalDAV config to avoid empty screens

Add CaldavConfigStore and preloadAppData() to load events (current month)
and CalDAV config into stores before dismissing the auth loading spinner.
This prevents the brief empty flash when first navigating to Calendar or
Settings tabs. Also applies Prettier formatting across codebase.

apps/client/src/app/(tabs)/calendar.tsx

@@ -11,12 +11,7 @@ import { EventCard } from "../../components/EventCard";
 import { DeleteEventModal } from "../../components/DeleteEventModal";
 import { ModalBase } from "../../components/ModalBase";
 import { ScrollableDropdown } from "../../components/ScrollableDropdown";
-import React, {
-  useCallback,
-  useEffect,
-  useMemo,
-  useState,
-} from "react";
+import React, { useCallback, useEffect, useMemo, useState } from "react";
 import { router, useFocusEffect } from "expo-router";
 import { Ionicons } from "@expo/vector-icons";
 import { useThemeStore } from "../../stores/ThemeStore";

apps/client/src/app/(tabs)/chat.tsx

@@ -175,7 +175,11 @@ const Chat = () => {
       params: {
         mode: "chat",
         eventData: JSON.stringify(proposal.event),
-        proposalContext: JSON.stringify({ messageId, proposalId, conversationId }),
+        proposalContext: JSON.stringify({
+          messageId,
+          proposalId,
+          conversationId,
+        }),
       },
     });
   };

apps/client/src/app/(tabs)/settings.tsx

@@ -8,8 +8,9 @@ import { Ionicons } from "@expo/vector-icons";
 import { SimpleHeader } from "../../components/Header";
 import { THEMES } from "../../Themes";
 import CustomTextInput from "../../components/CustomTextInput";
-import { useEffect, useState } from "react";
+import { useState } from "react";
 import { CaldavConfigService } from "../../services/CaldavConfigService";
+import { useCaldavConfigStore } from "../../stores";
 
 const handleLogout = async () => {
   await AuthService.logout();
@@ -34,38 +35,38 @@ type CaldavTextInputProps = {
   onValueChange: (text: string) => void;
 };
 
-const CaldavTextInput = ({ title, value, onValueChange }: CaldavTextInputProps) => {
+const CaldavTextInput = ({
+  title,
+  value,
+  onValueChange,
+}: CaldavTextInputProps) => {
   return (
     <View className="flex flex-row items-center py-1">
       <Text className="ml-4 w-24">{title}:</Text>
-      <CustomTextInput className="flex-1 mr-4" text={value} onValueChange={onValueChange} />
+      <CustomTextInput
+        className="flex-1 mr-4"
+        text={value}
+        onValueChange={onValueChange}
+      />
     </View>
   );
 };
 
 const CaldavSettings = () => {
   const { theme } = useThemeStore();
+  const { config, setConfig } = useCaldavConfigStore();
 
-  const [serverUrl, setServerUrl] = useState("");
-  const [username, setUsername] = useState("");
-  const [password, setPassword] = useState("");
-
-  useEffect(() => {
-    const loadConfig = async () => {
-      try {
-        const config = await CaldavConfigService.getConfig();
-        setServerUrl(config.serverUrl);
-        setUsername(config.username);
-        setPassword(config.password);
-      } catch {
-        // No config saved yet
-      }
-    };
-    loadConfig();
-  }, []);
+  const [serverUrl, setServerUrl] = useState(config?.serverUrl ?? "");
+  const [username, setUsername] = useState(config?.username ?? "");
+  const [password, setPassword] = useState(config?.password ?? "");
 
   const saveConfig = async () => {
-    await CaldavConfigService.saveConfig(serverUrl, username, password);
+    const saved = await CaldavConfigService.saveConfig(
+      serverUrl,
+      username,
+      password,
+    );
+    setConfig(saved);
   };
 
   const sync = async () => {
@@ -84,9 +85,21 @@ const CaldavSettings = () => {
       </View>
       <View>
         <View className="pb-1">
-          <CaldavTextInput title="url" value={serverUrl} onValueChange={setServerUrl} />
-          <CaldavTextInput title="username" value={username} onValueChange={setUsername} />
-          <CaldavTextInput title="password" value={password} onValueChange={setPassword} />
+          <CaldavTextInput
+            title="url"
+            value={serverUrl}
+            onValueChange={setServerUrl}
+          />
+          <CaldavTextInput
+            title="username"
+            value={username}
+            onValueChange={setUsername}
+          />
+          <CaldavTextInput
+            title="password"
+            value={password}
+            onValueChange={setPassword}
+          />
         </View>
         <View className="flex flex-row">
           <BaseButton className="mx-4 w-1/5" solid={true} onPress={saveConfig}>

apps/client/src/app/editEvent.tsx

@@ -19,7 +19,12 @@ import { Ionicons } from "@expo/vector-icons";
 import { ScrollableDropdown } from "../components/ScrollableDropdown";
 import { useDropdownPosition } from "../hooks/useDropdownPosition";
 import { EventService, ChatService } from "../services";
-import { buildRRule, CreateEventDTO, REPEAT_TYPE_LABELS, RepeatType } from "@calchat/shared";
+import {
+  buildRRule,
+  CreateEventDTO,
+  REPEAT_TYPE_LABELS,
+  RepeatType,
+} from "@calchat/shared";
 import { useChatStore } from "../stores";
 import CustomTextInput, {
   CustomTextInputProps,

apps/client/src/app/login.tsx

@@ -5,6 +5,7 @@ import BaseBackground from "../components/BaseBackground";
 import AuthButton from "../components/AuthButton";
 import { AuthService } from "../services";
 import { CaldavConfigService } from "../services/CaldavConfigService";
+import { preloadAppData } from "../components/AuthGuard";
 import { useThemeStore } from "../stores/ThemeStore";
 
 const LoginScreen = () => {
@@ -25,6 +26,7 @@ const LoginScreen = () => {
     setIsLoading(true);
     try {
       await AuthService.login({ identifier, password });
+      await preloadAppData();
       try {
         await CaldavConfigService.sync();
       } catch {

apps/client/src/components/AuthGuard.tsx

@@ -1,17 +1,52 @@
-import { useEffect, ReactNode } from "react";
+import { useEffect, useState, ReactNode } from "react";
 import { View, ActivityIndicator } from "react-native";
 import { Redirect } from "expo-router";
 import { useAuthStore } from "../stores";
 import { useThemeStore } from "../stores/ThemeStore";
+import { useEventsStore } from "../stores/EventsStore";
+import { useCaldavConfigStore } from "../stores/CaldavConfigStore";
+import { EventService } from "../services";
 import { CaldavConfigService } from "../services/CaldavConfigService";
 
 type AuthGuardProps = {
   children: ReactNode;
 };
 
+/**
+ * Preloads app data (events + CalDAV config) into stores.
+ * Called before the loading spinner is dismissed so screens have data immediately.
+ */
+export const preloadAppData = async () => {
+  const now = new Date();
+  const firstOfMonth = new Date(now.getFullYear(), now.getMonth(), 1);
+  const dayOfWeek = firstOfMonth.getDay();
+  const daysFromPrevMonth = dayOfWeek === 0 ? 6 : dayOfWeek - 1;
+  const startDate = new Date(
+    now.getFullYear(),
+    now.getMonth(),
+    1 - daysFromPrevMonth,
+  );
+  const endDate = new Date(startDate);
+  endDate.setDate(startDate.getDate() + 41);
+  endDate.setHours(23, 59, 59);
+
+  const [eventsResult, configResult] = await Promise.allSettled([
+    EventService.getByDateRange(startDate, endDate),
+    CaldavConfigService.getConfig(),
+  ]);
+
+  if (eventsResult.status === "fulfilled") {
+    useEventsStore.getState().setEvents(eventsResult.value);
+  }
+  if (configResult.status === "fulfilled") {
+    useCaldavConfigStore.getState().setConfig(configResult.value);
+  }
+};
+
 /**
  * Wraps content that requires authentication.
  * - Loads stored user on mount
+ * - Preloads app data (events, CalDAV config) before dismissing spinner
  * - Shows loading indicator while checking auth state
  * - Redirects to login if not authenticated
  * - Renders children if authenticated
@@ -19,11 +54,14 @@ type AuthGuardProps = {
 export const AuthGuard = ({ children }: AuthGuardProps) => {
   const { theme } = useThemeStore();
   const { isAuthenticated, isLoading, loadStoredUser } = useAuthStore();
+  const [dataReady, setDataReady] = useState(false);
 
   useEffect(() => {
     const init = async () => {
       await loadStoredUser();
       if (!useAuthStore.getState().isAuthenticated) return;
+      await preloadAppData();
+      setDataReady(true);
       try {
         await CaldavConfigService.sync();
       } catch {
@@ -33,7 +71,7 @@ export const AuthGuard = ({ children }: AuthGuardProps) => {
     init();
   }, [loadStoredUser]);
 
-  if (isLoading) {
+  if (isLoading || (isAuthenticated && !dataReady)) {
     return (
       <View
         style={{

apps/client/src/components/BaseButton.tsx

@@ -9,7 +9,12 @@ export type BaseButtonProps = {
   solid?: boolean;
 };
 
-const BaseButton = ({ className, children, onPress, solid = false }: BaseButtonProps) => {
+const BaseButton = ({
+  className,
+  children,
+  onPress,
+  solid = false,
+}: BaseButtonProps) => {
   const { theme } = useThemeStore();
   return (
     <Pressable

apps/client/src/components/DateTimePicker.tsx

@@ -126,11 +126,11 @@ const DateTimePickerButton = ({
 
 // Convenience wrappers for simpler usage
 export const DatePickerButton = (
-  props: Omit<DateTimePickerButtonProps, "mode">
+  props: Omit<DateTimePickerButtonProps, "mode">,
 ) => <DateTimePickerButton {...props} mode="date" />;
 
 export const TimePickerButton = (
-  props: Omit<DateTimePickerButtonProps, "mode">
+  props: Omit<DateTimePickerButtonProps, "mode">,
 ) => <DateTimePickerButton {...props} mode="time" />;
 
 export default DateTimePickerButton;

apps/client/src/components/ProposedEventCard.tsx

@@ -124,8 +124,12 @@ export const ProposedEventCard = ({
               color={theme.confirmButton}
               style={{ marginRight: 8 }}
             />
-            <Text style={{ color: theme.confirmButton }} className="font-medium">
-              Neue Ausnahme: {formatDate(new Date(proposedChange.occurrenceDate!))}
+            <Text
+              style={{ color: theme.confirmButton }}
+              className="font-medium"
+            >
+              Neue Ausnahme:{" "}
+              {formatDate(new Date(proposedChange.occurrenceDate!))}
             </Text>
           </View>
         )}
@@ -138,7 +142,10 @@ export const ProposedEventCard = ({
               color={theme.confirmButton}
               style={{ marginRight: 8 }}
             />
-            <Text style={{ color: theme.confirmButton }} className="font-medium">
+            <Text
+              style={{ color: theme.confirmButton }}
+              className="font-medium"
+            >
               Neues Ende: {formatDate(newUntilDate)}
             </Text>
           </View>

apps/client/src/stores/CaldavConfigStore.ts

@@ -0,0 +1,14 @@
+import { create } from "zustand";
+import { CaldavConfig } from "@calchat/shared";
+
+interface CaldavConfigState {
+  config: CaldavConfig | null;
+  setConfig: (config: CaldavConfig | null) => void;
+}
+
+export const useCaldavConfigStore = create<CaldavConfigState>((set) => ({
+  config: null,
+  setConfig: (config: CaldavConfig | null) => {
+    set({ config });
+  },
+}));

apps/client/src/stores/index.ts

@@ -5,3 +5,4 @@ export {
   type MessageData,
 } from "./ChatStore";
 export { useEventsStore } from "./EventsStore";
+export { useCaldavConfigStore } from "./CaldavConfigStore";