Add chat rooms, channels, sidebar nav, themes, and UI polish

Backend (profiles.py / main.py):
- Fix bot startup crash: create active user before start_chat
- Fix address-clobbering bug on restart (UserContactLink vs CreatedConnLink)
- Add user profile type alongside bots
- Channels: create groups with observer links, classify via acceptMemberRole
- Chat rooms: get_chat_history + send_to_chat, history/messages/send routes

UI:
- Chat room view with message bubbles and live polling
- Convert top nav to collapsible left sidebar (mobile-friendly off-canvas)
- Three-way Users/Bots split; clickable cards; copy-address buttons + links
- Add Matrix theme alongside Original Light/Dark
- File upload sidebar link; site footer on all pages incl. login
- Bot-type descriptions on the Bots page; QR caption on profiles

Remove orphaned index.html (superseded by list.html).
Ignore downloaded libs/, exploration DBs, and local ai.sh.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

manager/templates/settings.html

@@ -0,0 +1,153 @@
+{% extends "base.html" %}
+{% block title %}Settings — SimpleX Manager{% endblock %}
+
+{% block head %}
+<style>
+  .settings-section { margin-bottom: 32px; }
+  .settings-section h2 { margin-bottom: 16px; }
+
+  .theme-grid { display: flex; gap: 16px; flex-wrap: wrap; }
+
+  .theme-card {
+    flex: 0 0 180px;
+    border: 2px solid var(--border);
+    border-radius: 12px;
+    overflow: hidden;
+    cursor: pointer;
+    transition: border-color 0.2s, box-shadow 0.2s;
+    background: var(--card);
+  }
+  .theme-card:hover { border-color: var(--accent); }
+  .theme-card.selected {
+    border-color: var(--accent);
+    box-shadow: 0 0 0 3px rgba(0,83,208,0.18);
+  }
+  [data-theme="original-dark"] .theme-card.selected {
+    box-shadow: 0 0 0 3px rgba(112,240,249,0.2);
+  }
+  [data-theme="matrix"] .theme-card.selected {
+    box-shadow: 0 0 0 3px rgba(0,255,65,0.25);
+  }
+
+  .theme-preview {
+    height: 96px;
+    padding: 10px;
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+  }
+  .preview-bar { border-radius: 4px; height: 14px; }
+  .preview-bar-sm { border-radius: 4px; height: 9px; width: 60%; }
+  .preview-dot { width: 20px; height: 20px; border-radius: 50%; margin-top: auto; }
+
+  .theme-label {
+    padding: 10px 14px;
+    border-top: 1px solid;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    font-size: 13px;
+    font-weight: 600;
+  }
+  .checkmark {
+    width: 18px; height: 18px; border-radius: 50%;
+    background: var(--accent);
+    display: flex; align-items: center; justify-content: center;
+    font-size: 11px;
+    color: var(--btn-light-text);
+    opacity: 0;
+    transition: opacity 0.15s;
+  }
+  .theme-card.selected .checkmark { opacity: 1; }
+
+  /* Original Light preview colors (hardcoded so visible regardless of current theme) */
+  .preview-light { background: #f5f5f7; }
+  .preview-light .preview-bar  { background: #ffffff; }
+  .preview-light .preview-bar-sm { background: #e0e0e5; }
+  .preview-light .preview-dot   { background: #0053D0; }
+  .preview-light + .theme-label { border-color: #e0e0e5; color: #1d1d1f; background: #fff; }
+
+  /* Original Dark preview colors */
+  .preview-dark { background: #111827; }
+  .preview-dark .preview-bar  { background: #0B2A59; }
+  .preview-dark .preview-bar-sm { background: #1e3a5f; }
+  .preview-dark .preview-dot   { background: #70F0F9; }
+  .preview-dark + .theme-label { border-color: #1e3a5f; color: #f5f5f7; background: #0B2A59; }
+
+  /* Matrix preview colors */
+  .preview-matrix { background: #000000; }
+  .preview-matrix .preview-bar  { background: #062006; }
+  .preview-matrix .preview-bar-sm { background: #0f3d0f; }
+  .preview-matrix .preview-dot   { background: #00ff41; box-shadow: 0 0 8px #00ff41; }
+  .preview-matrix + .theme-label { border-color: #0f3d0f; color: #00ff41; background: #050d05;
+                                   font-family: 'Consolas', monospace; }
+</style>
+{% endblock %}
+
+{% block content %}
+<h1>Settings</h1>
+
+<div class="card settings-section">
+  <h2>Theme</h2>
+  <div class="theme-grid">
+
+    <div class="theme-card" id="card-original-light" onclick="setTheme('original-light')">
+      <div class="theme-preview preview-light">
+        <div class="preview-bar"></div>
+        <div class="preview-bar-sm"></div>
+        <div class="preview-bar-sm"></div>
+        <div class="preview-dot"></div>
+      </div>
+      <div class="theme-label">
+        <span>Original Light</span>
+        <span class="checkmark">✓</span>
+      </div>
+    </div>
+
+    <div class="theme-card" id="card-original-dark" onclick="setTheme('original-dark')">
+      <div class="theme-preview preview-dark">
+        <div class="preview-bar"></div>
+        <div class="preview-bar-sm"></div>
+        <div class="preview-bar-sm"></div>
+        <div class="preview-dot"></div>
+      </div>
+      <div class="theme-label">
+        <span>Original Dark</span>
+        <span class="checkmark">✓</span>
+      </div>
+    </div>
+
+    <div class="theme-card" id="card-matrix" onclick="setTheme('matrix')">
+      <div class="theme-preview preview-matrix">
+        <div class="preview-bar"></div>
+        <div class="preview-bar-sm"></div>
+        <div class="preview-bar-sm"></div>
+        <div class="preview-dot"></div>
+      </div>
+      <div class="theme-label">
+        <span>Matrix</span>
+        <span class="checkmark">✓</span>
+      </div>
+    </div>
+
+  </div>
+</div>
+
+<script>
+function currentTheme() {
+  return localStorage.getItem('theme') ||
+    (window.matchMedia('(prefers-color-scheme:dark)').matches ? 'original-dark' : 'original-light');
+}
+
+function setTheme(t) {
+  localStorage.setItem('theme', t);
+  document.documentElement.setAttribute('data-theme', t);
+  document.querySelectorAll('.theme-card').forEach(c => c.classList.remove('selected'));
+  const card = document.getElementById('card-' + t);
+  if (card) card.classList.add('selected');
+}
+
+// Mark current selection on load
+document.getElementById('card-' + currentTheme())?.classList.add('selected');
+</script>
+{% endblock %}