Add conversation and message model selection

internal/service/templates/static/modal/compose-settings.gohtml

@@ -14,6 +14,17 @@
         </button>
       </div>
 
+      <div class="settings-field">
+        <label class="settings-label" for="compose-model">Model</label>
+        <select
+          id="compose-model"
+          class="settings-select"
+          aria-label="Model"
+        >
+          <option value="" disabled selected>Loading...</option>
+        </select>
+      </div>
+
       <div class="settings-field">
         <label class="settings-label" for="max-turns-input">
           Max Iterations

internal/service/templates/static/modal/settings.gohtml

@@ -41,8 +41,8 @@
           id="panel-model-voice"
           aria-labelledby="tab-model-voice"
         >
-          <label class="settings-label" for="model">Model</label>
-          <select id="model" class="settings-select" aria-label="Model">
+          <label class="settings-label" for="model">Default Model</label>
+          <select id="model" class="settings-select" aria-label="Default model">
             <option value="" disabled selected>Loading...</option>
           </select>
 
@@ -61,7 +61,7 @@
           hidden
         >
           <label class="settings-label" for="system-message-input">
-            System Message
+            Default System Message
           </label>
           <textarea
             id="system-message-input"