Enhance Star Wars Journal with custom chat styles and UI tweaks

- Added a hook to apply custom CSS classes to chat messages based on flags in `asc-starwars.js`.
- Updated `StarWarsStyleJournalSheet` to apply the 'asc-starwars' class and ensure the journal renders in a collapsed state by default.
- Enhanced `asc-starwars-journal.css` to improve visual consistency:
  - Applied starry background and Star Wars-themed fonts to journal entries and chat messages.
  - Adjusted layout, padding, and width for better readability.
  - Added rounded borders, padding, and margins to message content for a polished look.

These updates improve the thematic immersion and UI aesthetics of the Star Wars journal and chat features.

src/scripts/asc-starwars.js

@@ -8,4 +8,11 @@ Hooks.once('ready', () => {
     label: 'Star Wars Style Journal',
     makeDefault: false // Set to true if you want this as the default
   });
+});
+
+Hooks.on("renderChatMessage", (message, html, data) => {
+  let customClass = message.getFlag("asc-starwars-style-journal", "customClass");
+  if (customClass) {
+      html.addClass(customClass);
+  }
 });