UX: Mini fixes and tweaks (#179)

* Changing the category & tag dropdown back into their original form.
The breadcrumb idea isn't working well.

| BC | AC |
|--------|--------|
| ![CleanShot 2025-06-09 at 18 59
37@2x](https://github.com/user-attachments/assets/cbeb3aaf-ad0e-4085-8548-58ea0a521c95)
| ![CleanShot 2025-06-09 at 18 57
33@2x](https://github.com/user-attachments/assets/15db752b-4983-4b7f-b6f8-9a8ded9e6f9f)
|

* Alignment fix in chat navbar drawer

| BC | AC |
|--------|--------|
| ![CleanShot 2025-06-09 at 18 59
18@2x](https://github.com/user-attachments/assets/38c7dcee-dc77-4a44-ae8d-5ecb7910536b)
| ![CleanShot 2025-06-09 at 18 58
36@2x](https://github.com/user-attachments/assets/be699f88-4e5e-4d8c-ab4d-f6d1eca93037)
|

scss/chat.scss

@@ -5,7 +5,9 @@
 }
 
 .c-navbar-container {
-  padding: 0 1.5em;
+  .full-page-chat & {
+    padding: 0 1.5em;
+  }
   background-color: var(--d-content-background);
 }
 
@@ -21,6 +23,10 @@ body.has-full-page-chat {
   .chat-drawer.is-expanded & {
     border: none;
   }
+
+  .c-navbar__title {
+    padding-left: 0.33em; // visual alignment for chat index, which does not havea a backarrow
+  }
 }
 
 .chat-drawer-outlet-container {