feat(hubspot): add dark mode support and light color scheme for chat widget

- Removed production check to ensure HubSpot script loads in all environments.
- Implemented dark mode CSS injection when the dark theme is active.
- Added a style block to enforce a light color scheme for the HubSpot chat widget, improving visibility and user experience.

worklenz-frontend/public/js/hubspot.js

@@ -15,7 +15,7 @@ class HubSpotManager {
    * Load HubSpot script with dark mode support
    */
   init() {
-    if (!this.isProduction) return;
+    // if (!this.isProduction) return;
 
     const loadHubSpot = () => {
       const script = document.createElement('script');
@@ -52,6 +52,7 @@ class HubSpotManager {
         existingStyle.remove();
       }
       
+      // Apply dark mode CSS if dark theme is active
       if (isDark) {
         this.injectDarkModeCSS();
       }
@@ -121,4 +122,11 @@ document.addEventListener('DOMContentLoaded', () => {
   
   // Make available globally for potential cleanup
   window.HubSpotManager = hubspot;
-});
+});
+
+// Add this style to ensure the chat widget uses the light color scheme
+(function() {
+  var style = document.createElement('style');
+  style.innerHTML = '#hubspot-messages-iframe-container { color-scheme: light !important; }';
+  document.head.appendChild(style);
+})();