Add scheduled social posts, Discord channels config, and LinkedIn personal posting fix

- Scheduled posts: new Schedule tab with multi-platform post scheduling (Discord,
  Mastodon, LinkedIn); SQLite queue with per-target delivery tracking and retry;
  cron script in bin/process-scheduled-posts.php processes due targets inline
- Discord channels: new config section for webhook-based channels used as scheduled
  post targets; webhook URLs stored in .env as DISCORD_WEBHOOK_<KEY>
- LinkedIn: fix botcompose_post to use member_id (urn:li:person) for personal
  profiles instead of hardcoded org author; filter org pages out of compose UI
  and RSS modal picker since org posting is unsupported; label org pages clearly

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

views/project/_tab_botconfig.php

@@ -31,8 +31,21 @@
 
   <hr>
 
-  <!-- LinkedIn Pages -->
-  <h6 class="mb-3 mt-3"><i class="bi bi-linkedin me-1 text-primary"></i>LinkedIn Pages</h6>
+  <!-- Discord Channels (for scheduled posts) -->
+  <h6 class="mb-1 mt-3"><i class="bi bi-discord me-1 text-primary"></i>Discord Channels</h6>
+  <p class="text-muted small mb-3">
+    Add the webhook URL to <code>.env</code> as <code>DISCORD_WEBHOOK_&lt;KEY&gt;</code> (uppercase).
+    These channels are available as targets for scheduled posts.
+  </p>
+  <div id="discordChannelList" class="mb-2"><div class="text-muted small">Loading…</div></div>
+  <button class="btn btn-sm btn-outline-primary mb-4" id="addDiscordChannelBtn">
+    <i class="bi bi-plus-lg me-1"></i>Add Channel
+  </button>
+
+  <hr>
+
+  <!-- LinkedIn -->
+  <h6 class="mb-3 mt-3"><i class="bi bi-linkedin me-1 text-primary"></i>LinkedIn</h6>
 
   <div class="card mb-3">
     <div class="card-body py-2 d-flex align-items-center gap-3">
@@ -202,6 +215,36 @@
   </div>
 </div>
 
+<!-- Discord channel modal -->
+<div class="modal fade" id="discordChannelModal" tabindex="-1">
+  <div class="modal-dialog modal-sm">
+    <div class="modal-content">
+      <div class="modal-header py-2">
+        <h6 class="modal-title" id="discordChannelModalTitle">Add Discord Channel</h6>
+        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+      </div>
+      <div class="modal-body">
+        <input type="hidden" id="discordChannelModalMode">
+        <div class="mb-2">
+          <label class="form-label small">Channel key</label>
+          <input type="text" id="discordChannelName" class="form-control form-control-sm font-monospace"
+                 placeholder="general" autocomplete="off">
+          <div class="form-text small">Used as <code>DISCORD_WEBHOOK_&lt;KEY&gt;</code> in .env (uppercase).</div>
+        </div>
+        <div class="mb-2">
+          <label class="form-label small">Label</label>
+          <input type="text" id="discordChannelLabel" class="form-control form-control-sm" placeholder="General">
+        </div>
+      </div>
+      <div class="modal-footer py-2">
+        <div class="text-danger small d-none flex-grow-1" id="discordChannelModalError"></div>
+        <button type="button" class="btn btn-secondary btn-sm" data-bs-dismiss="modal">Cancel</button>
+        <button type="button" class="btn btn-primary btn-sm" id="discordChannelModalSaveBtn">Save</button>
+      </div>
+    </div>
+  </div>
+</div>
+
 <!-- LinkedIn page modal -->
 <div class="modal fade" id="linkedinPageModal" tabindex="-1">
   <div class="modal-dialog modal-sm">

views/project/_tab_botschedule.php

@@ -0,0 +1,80 @@
+<div id="botSchedulePanel" data-project-id="<?= $pid ?>">
+
+  <!-- Create form -->
+  <div class="card mb-4">
+    <div class="card-header py-2 small fw-semibold"><i class="bi bi-clock me-1"></i>Schedule a Post</div>
+    <div class="card-body">
+      <div class="mb-2">
+        <label class="form-label small">Content</label>
+        <textarea id="schedContent" rows="4" class="form-control form-control-sm font-monospace"
+                  placeholder="What's on your mind?"></textarea>
+      </div>
+      <div class="mb-3">
+        <label class="form-label small">URL <span class="text-muted">(optional — appended to content)</span></label>
+        <input type="url" id="schedUrl" class="form-control form-control-sm font-monospace"
+               placeholder="https://example.com/post">
+      </div>
+      <div class="mb-3">
+        <label class="form-label small">Send at</label>
+        <input type="datetime-local" id="schedAt" class="form-control form-control-sm" style="max-width:240px">
+      </div>
+
+      <label class="form-label small">Platforms</label>
+
+      <div class="mb-2">
+        <div class="form-check">
+          <input class="form-check-input" type="checkbox" id="schedUseDiscord">
+          <label class="form-check-label small fw-semibold" for="schedUseDiscord">
+            <i class="bi bi-discord me-1 text-primary"></i>Discord
+          </label>
+        </div>
+        <div id="schedDiscordPicker" class="d-none ms-3 mt-1">
+          <div id="schedDiscordChannels" class="d-flex flex-wrap gap-2"></div>
+          <div class="text-muted small d-none" id="schedDiscordEmpty">
+            No Discord channels configured — add them in the Config tab.
+          </div>
+        </div>
+      </div>
+
+      <div class="mb-2">
+        <div class="form-check">
+          <input class="form-check-input" type="checkbox" id="schedUseMastodon">
+          <label class="form-check-label small fw-semibold" for="schedUseMastodon">
+            <i class="bi bi-mastodon me-1 text-primary"></i>Mastodon
+          </label>
+        </div>
+        <div id="schedMastodonPicker" class="d-none ms-3 mt-1">
+          <div id="schedMastodonAccounts" class="d-flex flex-wrap gap-2"></div>
+          <div class="text-muted small d-none" id="schedMastodonEmpty">
+            No Mastodon accounts configured — add them in the Config tab.
+          </div>
+        </div>
+      </div>
+
+      <div class="mb-3">
+        <div class="form-check">
+          <input class="form-check-input" type="checkbox" id="schedUseLinkedin">
+          <label class="form-check-label small fw-semibold" for="schedUseLinkedin">
+            <i class="bi bi-linkedin me-1 text-primary"></i>LinkedIn
+          </label>
+        </div>
+        <div id="schedLinkedinPicker" class="d-none ms-3 mt-1">
+          <div id="schedLinkedinProfiles" class="d-flex flex-wrap gap-2"></div>
+          <div class="text-muted small d-none" id="schedLinkedinEmpty">
+            No LinkedIn profiles connected — connect your account in the Config tab.
+          </div>
+        </div>
+      </div>
+
+      <div class="text-danger small d-none mb-2" id="schedError"></div>
+      <button class="btn btn-primary btn-sm" id="schedSubmitBtn">
+        <i class="bi bi-calendar-check me-1"></i>Schedule Post
+      </button>
+    </div>
+  </div>
+
+  <!-- Post list -->
+  <h6 class="mb-3">Scheduled &amp; Recent Posts</h6>
+  <div id="schedPostsList"><div class="text-muted small">Loading…</div></div>
+
+</div>

views/project/view.php

@@ -40,7 +40,7 @@ $tabLabels = [
     'plugins'   => 'Plugins',   'git'       => 'Git',
     'notes'     => 'Notes',     'settings'  => 'Settings',
     'bot'       => 'Bot',       'botconfig' => 'Config',
-    'logs'      => 'Logs',
+    'botschedule' => 'Schedule', 'logs'    => 'Logs',
 ];
 $tabIcons = [
     'dashboard' => 'bi-grid-1x2',         'analytics' => 'bi-graph-up',
@@ -50,11 +50,11 @@ $tabIcons = [
     'plugins'   => 'bi-puzzle',           'git'       => 'bi-git',
     'notes'     => 'bi-sticky',           'settings'  => 'bi-gear',
     'bot'       => 'bi-robot',            'botconfig' => 'bi-sliders2',
-    'logs'      => 'bi-journal-text',
+    'botschedule' => 'bi-calendar-event', 'logs'    => 'bi-journal-text',
 ];
 $tabGroups = [
     ['dashboard', 'analytics'],
-    ['bot', 'botconfig', 'logs'],
+    ['bot', 'botconfig', 'botschedule', 'logs'],
     ['posts', 'config', 'files', 'media'],
     ['run', 'themes', 'plugins', 'git'],
     ['notes', 'settings'],
@@ -267,6 +267,9 @@ $tabGroups = [
 <?php elseif ($tab === 'botconfig'): ?>
 <?php include ROOT . '/views/project/_tab_botconfig.php'; ?>
 
+<?php elseif ($tab === 'botschedule'): ?>
+<?php include ROOT . '/views/project/_tab_botschedule.php'; ?>
+
 <?php elseif ($tab === 'logs'): ?>
 <?php include ROOT . '/views/project/_tab_logs.php'; ?>