✨ **Add Latvian translations and enhance localization support**

- ➕ Added Latvian (`lv`) JSON translations and validation/password localization files.
- 🛠️ Updated `lang-country` config to include `lv-LV` and centralized language definitions.
- 🌐 Extended sidebar and navigation with new translatable strings.
- ➕ Introduced 72px width customization for the sidebar layout.
- ✅ Improved timezone mapping in Nostr publishing commands (added `Europe/Riga`).
- 🛠️ Refactored language selector to dynamically source available languages from the config.

lang/lv/auth.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'failed' => 'Šie dati neatbilst mūsu reģistram.',
+    'password' => 'Parole ir nepareiza.',
+    'throttle' => 'Pārāk daudz pieteikšanās mēģinājumu. Lūdzu mēģiniet vēlreiz pēc :seconds sekundēm.',
+];