Improve LinkedIn UI and scheduling robustness

- When LinkedIn is connected, replace the Connect button with a pencil
  (test post to first personal profile) and a reconnect arrow icon
- Add Process Now button to the Schedule tab that shells out to the cron
  script on demand and shows its output inline
- Add flock() to the cron script to prevent overlapping runs
- Fix cron install path comment to match deployed location

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

views/project/_tab_botconfig.php

@@ -53,9 +53,17 @@
         <div class="small fw-semibold" id="liConnectionLabel">Checking…</div>
         <div class="text-muted small" id="liTokenExpiry"></div>
       </div>
-      <button class="btn btn-sm btn-outline-primary ms-auto" id="liConnectBtn">
-        <i class="bi bi-box-arrow-in-right me-1"></i>Connect LinkedIn
-      </button>
+      <div class="ms-auto d-flex gap-2 align-items-center">
+        <button class="btn btn-sm btn-outline-primary" id="liConnectBtn">
+          <i class="bi bi-box-arrow-in-right me-1"></i>Connect LinkedIn
+        </button>
+        <button class="btn btn-sm btn-outline-secondary d-none" id="liTestPostBtn" title="Test post to LinkedIn">
+          <i class="bi bi-pencil-square"></i>
+        </button>
+        <button class="btn btn-sm btn-outline-secondary d-none" id="liReconnectBtn" title="Reconnect OAuth">
+          <i class="bi bi-arrow-clockwise"></i>
+        </button>
+      </div>
     </div>
   </div>
 

views/project/_tab_botschedule.php

@@ -74,7 +74,15 @@
   </div>
 
   <!-- Post list -->
-  <h6 class="mb-3">Scheduled &amp; Recent Posts</h6>
+  <div class="d-flex align-items-center gap-2 mb-3">
+    <h6 class="mb-0">Scheduled &amp; Recent Posts</h6>
+    <button class="btn btn-sm btn-outline-secondary ms-auto" id="schedRunNowBtn" title="Process all due posts now">
+      <i class="bi bi-play-circle me-1"></i>Process Now
+    </button>
+  </div>
+  <div id="schedRunNowOutput" class="d-none mb-2">
+    <pre class="bg-body-secondary border rounded p-2 small mb-0" id="schedRunNowPre" style="max-height:160px;overflow:auto"></pre>
+  </div>
   <div id="schedPostsList"><div class="text-muted small">Loading…</div></div>
 
 </div>