Refactor AI analysis and email fetching functionality

- Removed AI analysis guide and related documentation files.
- Updated email fetching logic to intelligently determine start date based on the latest email date in the database.
- Enhanced the app module to include a button for re-analyzing threads with AI.
- Improved database interactions to trigger AI analysis after ingesting sent emails.
- Adjusted the UI to display additional information about threads, including formatted latest message dates.
- Removed outdated test scripts for AI analysis and email fetching.
- Updated styles for better responsiveness and layout in the frontend.

templates/threads.html

@@ -30,38 +30,38 @@
     </div>
   </div>
 
-  <div class="card table-wrap">
-    <table>
+  <div class="card table-wrap" style="width: 100%; max-width: none;">
+    <table style="width: 100%; table-layout: auto;">
       <thead>
         <tr>
-          <th>ID</th>
-          <th>Subject</th>
-          <th>AI Summary</th>
-          <th>Account</th>
-          <th>Msgs</th>
-          <th>Requires Reply</th>
-          <th>Updated</th>
+          <th style="width: 5%;">ID</th>
+          <th style="width: 25%;">Subject</th>
+          <th style="width: 25%;">AI Summary</th>
+          <th style="width: 10%;">Account</th>
+          <th style="width: 5%;">Msgs</th>
+          <th style="width: 15%;">Requires Reply</th>
+          <th style="width: 15%;">Last Message</th>
         </tr>
       </thead>
       <tbody>
         {% for t in threads %}
           <tr>
-            <td><a href="/thread/{{ t.id }}">{{ t.id }}</a></td>
-            <td>{{ t.subject }}</td>
-            <td class="muted">{{ t.ai_summary or '' }}</td>
-            <td><span class="badge">{{ t.account_email }}</span></td>
-            <td><span class="badge brand">{{ t.messages|length }}</span></td>
+            <td><a href="/thread/{{ t.thread.id }}">{{ t.frontend_id }}</a></td>
+            <td>{{ t.thread.subject }}</td>
+            <td class="muted">{{ t.thread.ai_summary or '' }}</td>
+            <td><span class="badge">{{ t.thread.account_email }}</span></td>
+            <td><span class="badge brand">{{ t.thread.messages|length }}</span></td>
             <td>
-              {% if t.requires_reply %}
+              {% if t.thread.requires_reply %}
                 <span class="badge warn">Needs reply</span>
               {% else %}
                 <span class="badge success">Up to date</span>
               {% endif %}
             </td>
-            <td class="muted">{{ t.updated_at }}</td>
+            <td class="muted">{{ t.formatted_date }}</td>
           </tr>
         {% else %}
-          <tr><td colspan="6">No threads yet</td></tr>
+          <tr><td colspan="7">No threads yet</td></tr>
         {% endfor %}
       </tbody>
     </table>