[0.9.1] Mobile: fixed topbar, global hive, per-message chat reply/switcher, forum subtopics, square module grid

- Topbar: single fixed line [logo][Personal][Community][avatar] in one dark
  tone (#121212) with gold accents only; the hive hexagons scroll below it.
- Hive: Personal/Community filter the home hive from any page; opening a
  category shows its modules as a 2x2 grid of square buttons (a lone odd
  button is centered instead of left-aligned).
- Chats: per-message reply (?replyTo=), chat switcher strip and quote banner;
  the message rate limit is lifted on mobile.
- Forums: optional subtopics (?topic=) with threaded rendering.
- Bottombar: fixed Inbox - PM - Write - Search - Graphos - Peers.

src/views/forum_view.js

@@ -282,8 +282,20 @@ exports.forumView = async (forums, currentFilter, params = {}) => {
   );
 };
 
-exports.singleForumView = async (forum, messagesData, currentFilter) => {
+exports.singleForumView = async (forum, messagesData, currentFilter, topic = '') => {
   const CAT_I18N_MAP_UP = ALL_CATS.reduce((m,c)=>{ m[c]=(catLabel(c)||c).toUpperCase(); return m; },{});
+  // móvil: subtopics — etiqueta opcional en los mensajes raíz → tira de pestañas + filtro por ?topic=
+  const forumMobile = process.env.OASIS_MOBILE === '1';
+  const rootMsgs = Array.isArray(messagesData.messages) ? messagesData.messages : [];
+  const forumTopics = forumMobile ? [...new Set(rootMsgs.map(m => String(m.subtopic || '').trim()).filter(Boolean))] : [];
+  const activeTopic = forumMobile ? String(topic || '').trim() : '';
+  const shownMsgs = activeTopic ? rootMsgs.filter(m => String(m.subtopic || '').trim() === activeTopic) : rootMsgs;
+  const topicStrip = (forumMobile && forumTopics.length)
+    ? div({ class: 'forum-topics' },
+        a({ class: activeTopic ? 'forum-topic-chip' : 'forum-topic-chip active', href: `/forum/${encodeURIComponent(forum.key)}` }, i18n.menuAll || 'All'),
+        ...forumTopics.map(t => a({ class: t === activeTopic ? 'forum-topic-chip active' : 'forum-topic-chip', href: `/forum/${encodeURIComponent(forum.key)}?topic=${encodeURIComponent(t)}` }, t))
+      )
+    : null;
   return template(forum.title,
     section(
       div({ class: 'tags-header' },
@@ -305,6 +317,7 @@ exports.singleForumView = async (forum, messagesData, currentFilter) => {
       )
     ),
     div({ class: 'forum-thread-container' },
+      topicStrip,
       div({
         class: 'forum-card forum-thread-header',
         style: 'display:flex;align-items:flex-start;'
@@ -394,6 +407,7 @@ exports.singleForumView = async (forum, messagesData, currentFilter) => {
           action: `/forum/${encodeURIComponent(forum.key)}/message`,
           class: 'new-message-form'
         },
+          forumMobile ? input({ type: 'text', name: 'subtopic', value: activeTopic, placeholder: 'Topic (optional)', class: 'forum-topic-input' }) : null,
           textarea({
             name: 'message',
             rows: 4,
@@ -408,7 +422,7 @@ exports.singleForumView = async (forum, messagesData, currentFilter) => {
           }, i18n.forumSendButton)
         )
       ),
-      ...renderThread(messagesData.messages, 0, forum.key)
+      ...renderThread(shownMsgs, 0, forum.key)
     )
   );
 };