docs: document screenshare/PTT/status features in README + landing page

README.md:
- Replaced the stale 'Auto-revert spotlight on screenshare' entry
  (that 600ms revert-to-grid code was removed — it caused fullscreen
  to show avatars instead of the screenshare)
- Added accurate entries for all four features added this cycle:
  Screenshare fullscreen, PiP screenshare focus, Screenshare audio
  mute, Custom status message

landing/index.html:
- Updated Lotus Fork feature description paragraph to mention
  screenshare fullscreen, screenshare audio mute, PTT, and custom
  status messages
- Added PTT row to Voice & Video comparison table
- Updated Screenshare row for Lotus Chat to note fullscreen + audio mute
- Added 'Custom status message' row to UX & Extras section

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

landing/index.html

@@ -554,7 +554,7 @@
                 </a>
             </div>
             <p class="also-available">
-                Our Lotus Guild fork of Cinny adds: voice message recording (MSC3245, works E2EE), device verification fix (cross-client SAS emoji + inline cards), per-member device session panel with per-device verify buttons, presence status indicators (online/busy/away dots) in member lists, incoming call ring + Answer/Decline (DMs &amp; group chats), GIF picker (Giphy), draggable+resizable picture-in-picture call window, poll display &amp; voting, message forwarding, image/video captions, location sharing (map view + send), deleted message placeholders, per-message read receipt avatars (click for full list with timestamps), chat wallpaper in calls, and the Lotus Terminal design theme.
+                Our Lotus Guild fork of Cinny adds: voice message recording (MSC3245, works E2EE), device verification fix (cross-client SAS emoji + inline cards), per-member device session panel with per-device verify buttons, presence status indicators (online/busy/away dots) in member lists, incoming call ring + Answer/Decline (DMs &amp; group chats), GIF picker (Giphy), draggable+resizable picture-in-picture call window, poll display &amp; voting, message forwarding, image/video captions, location sharing (map view + send), deleted message placeholders, per-message read receipt avatars (click for full list with timestamps), screenshare fullscreen button, screenshare audio mute (mute a screenshare's audio without leaving the call), PTT (Push-to-Talk with configurable hold key), custom status messages (shown below usernames in member lists, with emoji support, set in Settings), and the Lotus Terminal design theme.
                 Prefer the unmodified upstream? <a href="https://cinny.in" target="_blank" rel="noopener">cinny.in</a> works with our homeserver &mdash; set it to <code style="font-size:0.8em;color:#e88;">matrix.lotusguild.org</code>.
             </p>
 
@@ -793,7 +793,7 @@
                 </tr>
                 <tr>
                     <td>Screenshare</td>
-                    <td class="ours"><span class="yes">✓</span><small>via Element Call embed</small></td>
+                    <td class="ours"><span class="yes">✓</span><small>via Element Call; fullscreen button,<br>independent audio mute</small></td>
                     <td><span class="yes">✓</span><small>via Element Call embed</small></td>
                     <td><span class="yes">✓</span></td>
                     <td><span class="no">✗</span></td>
@@ -801,6 +801,16 @@
                     <td><span class="yes">✓</span></td>
                     <td><span class="yes">✓</span><small>XDG portals &amp; native</small></td>
                 </tr>
+                <tr>
+                    <td>Push-to-Talk<small>hold key to transmit</small></td>
+                    <td class="ours"><span class="yes">✓</span><small>configurable hold key,<br>PTT badge in call bar</small></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                </tr>
                 <tr>
                     <td>Group calls</td>
                     <td class="ours"><span class="yes">✓</span><small>via Element Call embed</small></td>
@@ -997,6 +1007,16 @@
                     <td><span class="yes">✓</span><small>avatar row below message</small></td>
                     <td><span class="yes">✓</span></td>
                 </tr>
+                <tr>
+                    <td>Custom status message<small>shown below username</small></td>
+                    <td class="ours"><span class="yes">✓</span><small>Discord-style; emoji picker,<br>editable in Settings</small></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="no">✗</span></td>
+                    <td><span class="yes">✓</span><small>via profile settings</small></td>
+                    <td><span class="no">✗</span></td>
+                </tr>
                 <tr>
                     <td>Push notifications</td>
                     <td class="ours"><span class="part">~</span><small>web push only</small></td>