feat: add optional custom argument topic override via Web UI

- Added optional 'topic' field to BipolarTriggerRequest model
- Added topic parameter to force_trigger_argument and force_trigger_argument_from_message_id
- Updated run_argument to accept optional custom topic (None=random, ''=no topic, str=custom)
- Added topic input field to Web UI trigger-argument section
- Updated JS to send topic in API request body
- Custom topics bypass the random rotation system, allowing manual theme control

bot/static/js/modes.js

@@ -249,6 +249,7 @@ async function triggerBipolarArgument() {
   const channelIdInput = document.getElementById('bipolar-channel-id').value.trim();
   const messageIdInput = document.getElementById('bipolar-message-id').value.trim();
   const context = document.getElementById('bipolar-context').value;
+  const topic = document.getElementById('bipolar-topic').value.trim();
   const statusDiv = document.getElementById('bipolar-status');
 
   if (!channelIdInput) {
@@ -278,6 +279,10 @@ async function triggerBipolarArgument() {
       requestBody.message_id = messageIdInput;
     }
 
+    if (topic) {
+      requestBody.topic = topic;
+    }
+
     const result = await apiCall('/bipolar-mode/trigger-argument', 'POST', requestBody);
 
     if (result.status === 'error') {
@@ -290,6 +295,7 @@ async function triggerBipolarArgument() {
     showNotification(`⚔️ Argument triggered!`);
 
     document.getElementById('bipolar-context').value = '';
+    document.getElementById('bipolar-topic').value = '';
     document.getElementById('bipolar-message-id').value = '';
 
     loadActiveArguments();