feat: Added light mode plus various bug fixes

- Added click handler for Easter egg that enables music inspiration feature.
- Updated credits page to include new icons and handle click events.
- Enhanced inspiration page to fetch and display Spotify track embed HTML.
- Refactored inspiration loading logic to include track data.
- Introduced theme selection in settings with light and dark modes.
- Updated settings page to reflect new theme options and improve toast messages.
- Refined layout styles across various pages for consistent theming.
- Bumped application version to 1.5.0 in installer script.

frontend/src/lib/stores/settings.svelte.ts

@@ -1,6 +1,8 @@
 import { browser } from "$app/environment";
 import type { EMLy_GUI_Settings } from "$lib/types";
 import { getFromLocalStorage, saveToLocalStorage } from "$lib/utils/localStorageHelper";
+import { applyTheme, getStoredTheme } from "$lib/utils/theme";
+import { setLocale } from "$lib/paraglide/runtime";
 
 const STORAGE_KEY = "emly_gui_settings";
 
@@ -11,7 +13,9 @@ const defaults: EMLy_GUI_Settings = {
     previewFileSupportedTypes: ["jpg", "jpeg", "png"],
     enableAttachedDebuggerProtection: true,
     useDarkEmailViewer: true,
-    enableUpdateChecker: true,
+    enableUpdateChecker: false,
+    musicInspirationEnabled: false,
+    theme: "dark",
 };
 
 class SettingsStore {
@@ -33,6 +37,37 @@ class SettingsStore {
                 console.error("Failed to load settings", e);
             }
         }
+
+        // Migration: Check for legacy musicInspirationEnabled key
+        const legacyMusic = getFromLocalStorage("musicInspirationEnabled");
+        if (legacyMusic !== null) {
+            this.settings.musicInspirationEnabled = legacyMusic === "true";
+            localStorage.removeItem("musicInspirationEnabled");
+            this.save(); // Save immediately to persist the migration
+        }
+        
+        // Sync theme from localStorage key used in app.html
+        const storedTheme = getStoredTheme();
+        if (!this.settings.theme) {
+            this.settings.theme = storedTheme;
+        } else if (this.settings.theme !== storedTheme) {
+            // If there's a mismatch, prioritize the theme from emly_theme key
+            this.settings.theme = storedTheme;
+        }
+        
+        // Apply the theme
+        applyTheme(this.settings.theme);
+
+        // Apply the language
+        if (this.settings.selectedLanguage) {
+            setLocale(this.settings.selectedLanguage);
+        }
+        
+        // Save defaults/merged settings to storage if they didn't exist or were updated during load
+        if (!stored) {
+            this.save();
+        }
+
         this.hasHydrated = true;
     }
 
@@ -43,11 +78,20 @@ class SettingsStore {
 
     update(newSettings: Partial<EMLy_GUI_Settings>) {
         this.settings = { ...this.settings, ...newSettings };
+        
+        // Apply theme if it changed
+        if (newSettings.theme && this.settings.theme) {
+            applyTheme(this.settings.theme);
+        }
+        
         this.save();
     }
     
     reset() {
         this.settings = { ...defaults };
+        if (this.settings.theme) {
+            applyTheme(this.settings.theme);
+        }
         this.save();
     }
 }