Move auth and timezone hooks into dedicated hook files

Docs/Tasks.md

@@ -176,6 +176,8 @@ Reference: `Docs/Refactoring.md` for full analysis of each issue.
 
 **Goal:** Move `useAuth()` into its own file `frontend/src/hooks/useAuth.ts` and `useTimezone()` into `frontend/src/hooks/useTimezone.ts`. Each provider file should only define and export the context object and the provider component. The hooks should import the context from the provider file and re-export it from the `hooks/` directory.
 
+**Status:** Completed.
+
 **Possible traps and issues:**
 - Every file that currently imports `useAuth` from `providers/AuthProvider` must update its import path. Run a global search for `from "../providers/AuthProvider"` and `from "../../providers/AuthProvider"` to find all consumers before moving.
 - The context object (`AuthContext`, `TimezoneContext`) must remain exported from the provider file so the hook can import it. Do not move the context — only the hook function.

frontend/src/components/RequireAuth.tsx

@@ -7,7 +7,7 @@
  */
 
 import { Navigate, useLocation } from "react-router-dom";
-import { useAuth } from "../providers/AuthProvider";
+import { useAuth } from "../hooks/useAuth";
 
 interface RequireAuthProps {
   /** The protected page content to render when authenticated. */

frontend/src/hooks/useAuth.ts

@@ -0,0 +1,15 @@
+import { useContext } from "react";
+import { AuthContext, type AuthContextValue } from "../providers/AuthProvider";
+
+/**
+ * Access authentication state and actions from a mounted AuthProvider.
+ *
+ * @throws {Error} When called outside of `<AuthProvider>`.
+ */
+export function useAuth(): AuthContextValue {
+  const ctx = useContext(AuthContext);
+  if (ctx === null) {
+    throw new Error("useAuth must be used within <AuthProvider>.");
+  }
+  return ctx;
+}

frontend/src/hooks/useTimezone.ts

@@ -0,0 +1,15 @@
+import { useContext } from "react";
+import { TimezoneContext } from "../providers/TimezoneProvider";
+
+/**
+ * Return the configured IANA timezone from the mounted TimezoneProvider.
+ *
+ * @throws {Error} When called outside of `<TimezoneProvider>`.
+ */
+export function useTimezone(): string {
+  const context = useContext(TimezoneContext);
+  if (context === undefined) {
+    throw new Error("useTimezone must be used within <TimezoneProvider>.");
+  }
+  return context.timezone;
+}

frontend/src/layouts/MainLayout.tsx

@@ -30,7 +30,7 @@ import {
   NavigationRegular,
 } from "@fluentui/react-icons";
 import { NavLink, Outlet, useNavigate } from "react-router-dom";
-import { useAuth } from "../providers/AuthProvider";
+import { useAuth } from "../hooks/useAuth";
 import { useServerStatus } from "../hooks/useServerStatus";
 import { useBlocklistStatus } from "../hooks/useBlocklist";
 

frontend/src/pages/LoginPage.tsx

@@ -21,7 +21,7 @@ import {
 import { useNavigate, useSearchParams } from "react-router-dom";
 import type { ChangeEvent, FormEvent } from "react";
 import { ApiError } from "../api/client";
-import { useAuth } from "../providers/AuthProvider";
+import { useAuth } from "../hooks/useAuth";
 
 // ---------------------------------------------------------------------------
 // Styles

frontend/src/providers/AuthProvider.tsx

@@ -10,7 +10,6 @@
 import {
   createContext,
   useCallback,
-  useContext,
   useMemo,
   useState,
 } from "react";
@@ -25,7 +24,7 @@ interface AuthState {
   expiresAt: string | null;
 }
 
-interface AuthContextValue {
+export interface AuthContextValue {
   /** `true` when a valid session token is held in state. */
   isAuthenticated: boolean;
   /**
@@ -41,7 +40,7 @@ interface AuthContextValue {
 // Context
 // ---------------------------------------------------------------------------
 
-const AuthContext = createContext<AuthContextValue | null>(null);
+export const AuthContext = createContext<AuthContextValue | null>(null);
 
 const SESSION_KEY = "bangui_token";
 const SESSION_EXPIRES_KEY = "bangui_expires_at";
@@ -97,22 +96,3 @@ export function AuthProvider({
 
   return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
 }
-
-// ---------------------------------------------------------------------------
-// Hook
-// ---------------------------------------------------------------------------
-
-/**
- * Access authentication state and actions.
- *
- * Must be called inside a component rendered within `<AuthProvider>`.
- *
- * @throws {Error} When called outside of `<AuthProvider>`.
- */
-export function useAuth(): AuthContextValue {
-  const ctx = useContext(AuthContext);
-  if (ctx === null) {
-    throw new Error("useAuth must be used within <AuthProvider>.");
-  }
-  return ctx;
-}

frontend/src/providers/TimezoneProvider.tsx

@@ -9,19 +9,19 @@
  * always receive a safe fallback.
  */
 
-import { createContext, useContext, useMemo } from "react";
+import { createContext, useMemo } from "react";
 import { useTimezoneData } from "../hooks/useTimezoneData";
 
 // ---------------------------------------------------------------------------
 // Context definition
 // ---------------------------------------------------------------------------
 
-interface TimezoneContextValue {
+export interface TimezoneContextValue {
   /** IANA timezone string, e.g. ``"Europe/Berlin"`` or ``"UTC"``. */
   timezone: string;
 }
 
-const TimezoneContext = createContext<TimezoneContextValue>({ timezone: "UTC" });
+export const TimezoneContext = createContext<TimezoneContextValue | undefined>(undefined);
 
 // ---------------------------------------------------------------------------
 // Provider
@@ -53,24 +53,3 @@ export function TimezoneProvider({
     <TimezoneContext.Provider value={value}>{children}</TimezoneContext.Provider>
   );
 }
-
-// ---------------------------------------------------------------------------
-// Hook
-// ---------------------------------------------------------------------------
-
-/**
- * Return the IANA timezone string configured during setup.
- *
- * Must be used inside a {@link TimezoneProvider}.
- *
- * @returns The configured timezone, e.g. ``"Europe/Berlin"``.
- *
- * @example
- * ```tsx
- * const { timezone } = useTimezone();
- * const label = formatDate(item.created_at, timezone);
- * ```
- */
-export function useTimezone(): string {
-  return useContext(TimezoneContext).timezone;
-}