v2.4.4: Rename Profiles to Configurations, add Identity Switcher

- Rename "Profiles" to "Configurations" in all UI text and 11 locale files
- Add identity switcher dropdown in header (green accent, fa-id-badge icon)
- Quick-switch player identity without opening Settings
- "Manage" action opens UUID Management modal
- Header tooltips explaining what each dropdown does
- Config dropdown icon changed from fa-user-circle to fa-sliders-h
- Global Escape key handler for closing modals and dropdowns
- Fix identity selector not clickable (missing -webkit-app-region: no-drag)
- Sync header identity name after all identity-changing operations
- XSS protection in identity list rendering

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

GUI/locales/en.json

@@ -8,7 +8,10 @@
   },
   "header": {
     "playersLabel": "Players:",
-    "manageProfiles": "Manage Profiles",
+    "manageProfiles": "Manage",
+    "manageIdentities": "Manage",
+    "identityTooltip": "Your player name & UUID used in-game",
+    "configTooltip": "Game config: mods, Java & memory settings",
     "defaultProfile": "Default"
   },
   "install": {
@@ -162,21 +165,24 @@
   },
   "uuid": {
     "modalTitle": "UUID Management",
-    "currentUserUUID": "Current User UUID",
     "allPlayerUUIDs": "All Player UUIDs",
-    "generateNew": "Generate New UUID",
+    "addIdentity": "Add Identity",
+    "usernamePlaceholder": "Username",
+    "add": "Add",
+    "cancel": "Cancel",
+    "advanced": "Advanced",
     "loadingUUIDs": "Loading UUIDs...",
-    "setCustomUUID": "Set Custom UUID",
+    "setCustomUUID": "Set Custom UUID for Current User",
     "customPlaceholder": "Enter custom UUID (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)",
     "setUUID": "Set UUID",
     "warning": "Warning: Setting a custom UUID will change your current player identity",
     "copyTooltip": "Copy UUID",
     "regenerateTooltip": "Generate New UUID"
   },
-  "profiles": {
-    "modalTitle": "Manage Profiles",
-    "newProfilePlaceholder": "New Profile Name",
-    "createProfile": "Create Profile"
+  "configurations": {
+    "modalTitle": "Manage Configurations",
+    "newProfilePlaceholder": "New Configuration Name",
+    "createProfile": "Create Configuration"
   },
   "discord": {
     "notificationText": "Join our Discord community!",
@@ -230,6 +236,8 @@
     "hwAccelSaved": "Hardware acceleration setting saved",
     "hwAccelSaveFailed": "Failed to save hardware acceleration setting",
     "noUsername": "No username configured. Please save your username first.",
+    "identityAdded": "Identity added successfully!",
+    "identityAddFailed": "Failed to add identity",
     "switchUsernameSuccess": "Switched to \"{username}\" successfully!",
     "switchUsernameFailed": "Failed to switch username",
     "playerNameTooLong": "Player name must be 16 characters or less",
@@ -266,8 +274,8 @@
     "installing": "Installing...",
     "extracting": "Extracting...",
     "verifying": "Verifying...",
-    "switchingProfile": "Switching profile...",
-    "profileSwitched": "Profile switched!",
+    "switchingProfile": "Switching configuration...",
+    "profileSwitched": "Configuration switched!",
     "startingGame": "Starting game...",
     "launching": "LAUNCHING...",
     "uninstallingGame": "Uninstalling game...",