Refactor: Extract Plex composables and smaller components

Split large PlexSettings component into reusable pieces:

Composables:
- usePlexApi.ts: API functions for user data, servers, libraries
- usePlexAuth.ts: OAuth authentication flow, PIN generation, polling

Components:
- PlexAuthButton.vue: Sign-in button with OAuth popup
- PlexProfileCard.vue: User profile with badges (Pass, 2FA, Labs, years)

Benefits:
- Better code organization and maintainability
- Reusable authentication logic
- Cleaner separation of concerns
- Easier testing and debugging

src/composables/usePlexAuth.ts

@@ -0,0 +1,199 @@
+import { ref } from "vue";
+import { usePlexApi } from "./usePlexApi";
+
+export function usePlexAuth() {
+  const { CLIENT_IDENTIFIER, APP_NAME } = usePlexApi();
+
+  const loading = ref(false);
+  const plexPopup = ref<Window | null>(null);
+  const pollInterval = ref<number | null>(null);
+
+  // Generate a PIN for Plex OAuth
+  async function generatePlexPin() {
+    try {
+      const response = await fetch("https://plex.tv/api/v2/pins?strong=true", {
+        method: "POST",
+        headers: {
+          accept: "application/json",
+          "X-Plex-Product": APP_NAME,
+          "X-Plex-Client-Identifier": CLIENT_IDENTIFIER
+        }
+      });
+
+      if (!response.ok) throw new Error("Failed to generate PIN");
+      const data = await response.json();
+      return { id: data.id, code: data.code };
+    } catch (error) {
+      console.error("[PlexAuth] Error generating PIN:", error);
+      return null;
+    }
+  }
+
+  // Check PIN status
+  async function checkPin(pinId: number, pinCode: string) {
+    try {
+      const response = await fetch(
+        `https://plex.tv/api/v2/pins/${pinId}?code=${pinCode}`,
+        {
+          headers: {
+            accept: "application/json",
+            "X-Plex-Client-Identifier": CLIENT_IDENTIFIER
+          }
+        }
+      );
+
+      if (!response.ok) return null;
+      const data = await response.json();
+      return data.authToken;
+    } catch (error) {
+      console.error("[PlexAuth] Error checking PIN:", error);
+      return null;
+    }
+  }
+
+  // Construct auth URL
+  function constructAuthUrl(pinCode: string) {
+    const params = new URLSearchParams({
+      clientID: CLIENT_IDENTIFIER,
+      code: pinCode,
+      "context[device][product]": APP_NAME
+    });
+    return `https://app.plex.tv/auth#?${params.toString()}`;
+  }
+
+  // Start polling for PIN
+  function startPolling(
+    pinId: number,
+    pinCode: string,
+    onSuccess: (token: string) => void
+  ) {
+    pollInterval.value = window.setInterval(async () => {
+      const authToken = await checkPin(pinId, pinCode);
+      if (authToken) {
+        stopPolling();
+        if (plexPopup.value && !plexPopup.value.closed) {
+          plexPopup.value.close();
+        }
+        onSuccess(authToken);
+      }
+    }, 1000);
+  }
+
+  // Stop polling
+  function stopPolling() {
+    if (pollInterval.value) {
+      clearInterval(pollInterval.value);
+      pollInterval.value = null;
+    }
+  }
+
+  // Set cookie
+  function setPlexAuthCookie(authToken: string) {
+    const expires = new Date();
+    expires.setDate(expires.getDate() + 30);
+    document.cookie = `plex_auth_token=${authToken}; path=/; expires=${expires.toUTCString()}; SameSite=Strict`;
+  }
+
+  // Get cookie
+  function getCookie(name: string): string | null {
+    const value = `; ${document.cookie}`;
+    const parts = value.split(`; ${name}=`);
+    if (parts.length === 2) {
+      return parts.pop()?.split(";").shift() || null;
+    }
+    return null;
+  }
+
+  // Open authentication popup
+  async function openAuthPopup(
+    onSuccess: (token: string) => void,
+    onError: (msg: string) => void
+  ) {
+    loading.value = true;
+
+    const width = 600;
+    const height = 700;
+    const left = window.screen.width / 2 - width / 2;
+    const top = window.screen.height / 2 - height / 2;
+
+    plexPopup.value = window.open(
+      "about:blank",
+      "PlexAuth",
+      `width=${width},height=${height},left=${left},top=${top}`
+    );
+
+    if (!plexPopup.value) {
+      onError("Please allow popups for this site to authenticate with Plex");
+      loading.value = false;
+      return;
+    }
+
+    // Add loading screen
+    if (plexPopup.value.document) {
+      plexPopup.value.document.write(`
+        <html>
+          <head>
+            <title>Connecting to Plex...</title>
+            <style>
+              body { margin: 0; padding: 0; display: flex; justify-content: center; align-items: center; 
+                     height: 100vh; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; 
+                     background: #1c3a13; color: #fcfcf7; }
+              .spinner { border: 4px solid rgba(252, 252, 247, 0.3); border-top: 4px solid #fcfcf7; 
+                         border-radius: 50%; width: 40px; height: 40px; animation: spin 1s linear infinite; 
+                         margin: 0 auto 20px; }
+              @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
+            </style>
+          </head>
+          <body><div class="loader"><div class="spinner"></div><p>Connecting to Plex...</p></div></body>
+        </html>
+      `);
+    }
+
+    const pin = await generatePlexPin();
+    if (!pin) {
+      if (plexPopup.value && !plexPopup.value.closed) plexPopup.value.close();
+      onError("Could not generate Plex authentication PIN");
+      loading.value = false;
+      return;
+    }
+
+    const authUrl = constructAuthUrl(pin.code);
+    if (plexPopup.value && !plexPopup.value.closed) {
+      plexPopup.value.location.href = authUrl;
+    } else {
+      onError("Authentication window was closed");
+      loading.value = false;
+      return;
+    }
+
+    startPolling(pin.id, pin.code, onSuccess);
+
+    // Check if popup closed
+    const popupChecker = setInterval(() => {
+      if (plexPopup.value && plexPopup.value.closed) {
+        clearInterval(popupChecker);
+        stopPolling();
+        if (loading.value) {
+          loading.value = false;
+          onError("Plex authentication window was closed");
+        }
+      }
+    }, 500);
+  }
+
+  // Cleanup
+  function cleanup() {
+    stopPolling();
+    if (plexPopup.value && !plexPopup.value.closed) {
+      plexPopup.value.close();
+    }
+  }
+
+  return {
+    loading,
+    setPlexAuthCookie,
+    getCookie,
+    openAuthPopup,
+    cleanup
+  };
+}