[0.9.1] Mobile: Personal/Community filter the home hive from any page

- Turn the header Personal/Community tabs into links to
  /activity?hive=personal|community, so they work on every page (they take
  you to the home and filter the hexagons), not only while already on
  /activity — no more dead buttons off the home.
- Drop the "All" tab: entering shows all 10 categories; clicking a filter
  that is already active toggles it off and shows all again.
- Filter the hive server-side (renderHiveNav reads the request filter set
  by the middleware) instead of the CSS radio-hack, and drop the now-dead
  half-filter CSS. Active tab is highlighted via the .active class.

src/views/activity_view.js

@@ -1994,7 +1994,7 @@ exports.activityView = (actions, filter, userId, q = '', extras = {}) => {
         p(desc)
       ),
       renderHiveNav(),
-      input({ type: 'checkbox', id: 'activity-filter-toggle', class: 'hive-filter-radio' }),
+      input({ type: 'checkbox', id: 'activity-filter-toggle', class: 'activity-filter-toggle' }),
       label({ for: 'activity-filter-toggle', class: 'activity-filter-btn' },
         span(i18n.filter || 'Filter'), span({ class: 'activity-filter-caret' }, '▾')),
       div({ class: 'activity-filter-panel' },