add auto update for android

client/src/utils/autoUpdate.js

@@ -0,0 +1,55 @@
+import { Capacitor } from '@capacitor/core';
+import { App } from '@capacitor/app';
+
+export async function checkForUpdates() {
+  if (!Capacitor.isNativePlatform()) {
+    console.log('Auto-update skipped (running on web)');
+    return;
+  }
+
+  function isNewer(current, target) {
+    const c = current.replace(/^v/, '').split('.').map(Number);
+    const t = target.replace(/^v/, '').split('.').map(Number);
+
+    for (let i = 0; i < 3; i++) {
+      if (t[i] > c[i]) return true;
+      if (t[i] < c[i]) return false;
+    }
+    return false;
+  }
+
+  try {
+    const { CapacitorUpdater } = await import('@capgo/capacitor-updater');
+
+    await CapacitorUpdater.notifyAppReady();
+
+    const GITEA_API_URL = 'https://git.crylia.de/Crylia/zen-kanji/releases/latest';
+
+    const appInfo = await App.getInfo();
+    const currentVersion = appInfo.version;
+
+    const response = await fetch(GITEA_API_URL);
+    if (!response.ok) return;
+
+    const release = await response.json();
+    const latestTag = release.tag_name;
+
+    if (!isNewer(currentVersion, latestTag)) {
+      return;
+    }
+
+    const asset = release.assets.find((a) => a.name === 'dist.zip');
+    if (!asset) return;
+
+    console.log(`Downloading update: ${latestTag}`);
+
+    const version = await CapacitorUpdater.download({
+      url: asset.browser_download_url,
+      version: latestTag,
+    });
+
+    await CapacitorUpdater.set(version);
+  } catch (error) {
+    console.error('Auto-update failed:', error);
+  }
+}