fix: improve update system UX and macOS compatibility

Update System Improvements:
- Fix duplicate update popups by disabling legacy updater.js
- Add skip button to update popup (shows after 30s, on error, or after download)
- Add macOS-specific handling with manual download as primary option
- Add missing open-download-page IPC handler
- Add missing unblockInterface() method to properly clean up after popup close
- Add quitAndInstallUpdate alias in preload for compatibility
- Remove pulse animation when download completes
- Fix manual download button to show correct status and close popup
- Sync player name to settings input after first install

Client Patcher Cleanup:
- Remove server patching code (server uses pre-patched JAR from CDN)
- Simplify to client-only patching
- Remove unused imports (crypto, AdmZip, execSync, spawn, javaManager)
- Remove unused methods (stringToUtf8, findAndReplaceDomainUtf8)
- Move localhost dev code to backup file for reference

Code Quality Fixes:
- Fix duplicate DOMContentLoaded handlers in install.js
- Fix duplicate checkForUpdates definition in preload.js
- Fix redundant if/else in onProgressUpdate callback
- Fix typo "Harwadre" -> "Hardware" in preload.js

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

preload.js

@@ -24,7 +24,7 @@ contextBridge.exposeInMainWorld('electronAPI', {
   saveCloseLauncher: (enabled) => ipcRenderer.invoke('save-close-launcher', enabled),
   loadCloseLauncher: () => ipcRenderer.invoke('load-close-launcher'),
 
-  // Harwadre Acceleration
+  // Hardware Acceleration
   saveLauncherHardwareAcceleration: (enabled) => ipcRenderer.invoke('save-launcher-hw-accel', enabled),
   loadLauncherHardwareAcceleration: () => ipcRenderer.invoke('load-launcher-hw-accel'),
 
@@ -50,14 +50,7 @@ contextBridge.exposeInMainWorld('electronAPI', {
   selectModFiles: () => ipcRenderer.invoke('select-mod-files'),
   copyModFile: (sourcePath, modsPath) => ipcRenderer.invoke('copy-mod-file', sourcePath, modsPath),
   onProgressUpdate: (callback) => {
-    ipcRenderer.on('progress-update', (event, data) => {
-      // Ensure data includes retry state if available
-      if (data && typeof data === 'object') {
-        callback(data);
-      } else {
-        callback(data);
-      }
-    });
+    ipcRenderer.on('progress-update', (event, data) => callback(data));
   },
   onProgressComplete: (callback) => {
     ipcRenderer.on('progress-complete', () => callback());
@@ -69,7 +62,6 @@ contextBridge.exposeInMainWorld('electronAPI', {
     ipcRenderer.on('installation-end', () => callback());
   },
   getUserId: () => ipcRenderer.invoke('get-user-id'),
-  checkForUpdates: () => ipcRenderer.invoke('check-for-updates'),
   openDownloadPage: () => ipcRenderer.invoke('open-download-page'),
   getUpdateInfo: () => ipcRenderer.invoke('get-update-info'),
   onUpdatePopup: (callback) => {
@@ -126,6 +118,7 @@ contextBridge.exposeInMainWorld('electronAPI', {
   checkForUpdates: () => ipcRenderer.invoke('check-for-updates'),
   downloadUpdate: () => ipcRenderer.invoke('download-update'),
   installUpdate: () => ipcRenderer.invoke('install-update'),
+  quitAndInstallUpdate: () => ipcRenderer.invoke('install-update'),  // Alias for update.js compatibility
   getLauncherVersion: () => ipcRenderer.invoke('get-launcher-version'),
   onUpdateAvailable: (callback) => {
     ipcRenderer.on('update-available', (event, data) => callback(data));