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>

web/api/post_schedule.php

@@ -103,6 +103,15 @@ if ($action === 'delete') {
     exit;
 }
 
+// ── RUN NOW ───────────────────────────────────────────────────────────────────
+if ($action === 'run_now') {
+    $script = ROOT . '/bin/process-scheduled-posts.php';
+    if (!file_exists($script)) { echo json_encode(['error' => 'Cron script not found']); exit; }
+    $output = shell_exec('/usr/bin/php ' . escapeshellarg($script) . ' 2>&1');
+    echo json_encode(['ok' => true, 'output' => $output ?? '(no output)']);
+    exit;
+}
+
 // ── RETRY FAILED TARGET ───────────────────────────────────────────────────────
 if ($action === 'retry_target') {
     $target_id = (int)($input['target_id'] ?? 0);

web/assets/js/app.js

@@ -3469,13 +3469,25 @@ window.addEventListener('DOMContentLoaded', () => {
     label.textContent = connected ? 'Connected to LinkedIn' : 'Not connected';
     label.className = 'small fw-semibold ' + (connected ? 'text-success' : 'text-muted');
     expiry.textContent = li.token_expiry ? 'Expires: ' + li.token_expiry : '';
+    document.getElementById('liConnectBtn').classList.toggle('d-none', connected);
+    document.getElementById('liTestPostBtn').classList.toggle('d-none', !connected);
+    document.getElementById('liReconnectBtn').classList.toggle('d-none', !connected);
   }
 
-  document.getElementById('liConnectBtn').addEventListener('click', async () => {
+  async function _liOAuthRedirect() {
     const r = await fetch('/api/linkedin_auth?project_id=' + pid);
     const d = await r.json();
     if (d.error) { showError(d.error); return; }
     window.location.href = d.url;
+  }
+  document.getElementById('liConnectBtn').addEventListener('click', _liOAuthRedirect);
+  document.getElementById('liReconnectBtn').addEventListener('click', _liOAuthRedirect);
+
+  document.getElementById('liTestPostBtn').addEventListener('click', () => {
+    const pages = _config?.linkedin?.pages || {};
+    const personalKey = Object.keys(pages).find(k => pages[k].type === 'personal');
+    if (!personalKey) { showError('No personal LinkedIn profile configured — add one under LinkedIn Pages.'); return; }
+    openComposeModal('linkedin', personalKey, pages[personalKey].label || personalKey);
   });
 
   function renderLinkedinPages(pages) {
@@ -3749,6 +3761,24 @@ window.addEventListener('DOMContentLoaded', () => {
     }));
   }
 
+  document.getElementById('schedRunNowBtn')?.addEventListener('click', async () => {
+    const btn    = document.getElementById('schedRunNowBtn');
+    const outBox = document.getElementById('schedRunNowOutput');
+    const pre    = document.getElementById('schedRunNowPre');
+    btn.disabled = true;
+    outBox.classList.add('d-none');
+    const r = await fetch('/api/post_schedule', {
+      method: 'POST', headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ project_id: +pid, action: 'run_now' }),
+    });
+    const d = await r.json();
+    btn.disabled = false;
+    if (d.error) { showError(d.error); return; }
+    pre.textContent = d.output || '(no output — nothing due)';
+    outBox.classList.remove('d-none');
+    loadPosts();
+  });
+
   loadTargets();
   loadPosts();
 })();