Tweak chat bubble selection and metadata colours

I can do this confidently now that I've figured out how to test
them live on the phone! (Colours there render pretty differently
from the ones on my laptop screen, so I've got to view it directly
to make it work.)

public/kaios-native-ui.css

@@ -38,8 +38,9 @@
   --button-background-focused: #873eff;
   --button-color-focused: #ffffff;
 
-  --chatbox-indicator-background-focused: #6a6a6a;
-  --chatbox-indicator-color-focused: #ffffff;
+  --chatbox-indicator-color: #7d7d7d;
+  --chatbox-indicator-background-focused: #eaeaea;
+  --chatbox-indicator-color-focused: #7d7d7d;
   --chatbox-background: #cccccc;
   --chatbox-background-primary: #873eff;
   --chatbox-color: #323232;

src/components/ChatMessage.svelte

@@ -198,7 +198,7 @@
     margin: 0 0 0 4.5rem;
     font-size: 1.4rem;
     font-weight: 400;
-    color: var(--chatbox-color);
+    color: var(--chatbox-indicator-color);
   }
 
   .own-chat .chat-item-info {
@@ -212,7 +212,7 @@
   .chat-item-bare {
     font-size: 1.4rem;
     font-weight: 400;
-    color: var(--chatbox-color);
+    color: var(--chatbox-indicator-color);
     margin-top: 0;
     text-align: center;
   }