feat(hub): chat, presence, a Profile page, and downloads that do not freeze

Chat opens on the newest hundred messages, loads fifty older on demand with the
reading position anchored — the distance from the *bottom*, since everything
above the viewport just grew — and follows new messages only when the reader was
already at the end. Day separators, sender grouping, an unread marker, and a
jump-to-latest pill. Messages are keyed by id: index keys plus prepending makes
Preact reuse the wrong bubbles.

A presence dot per group in the sidebar, three states, each backed by something:
the hub's registry, or a connection this browser made or failed to make. Never
colour alone — red and green are the pair colour-blind readers cannot separate —
so each dot carries a title and an aria-label.

Profile is split out of Settings: identity, node link, pinned node identities and
account deletion. Mixing them put an irreversible button two scrolls under a
theme picker. The create-group page loses its centred 520 px card, which left
190 px of margin either side, and its two button panels become a radio group —
a button conveys no chosen state to a screen reader, and side by side they read
as two independent actions rather than one either/or.

The Files toolbar shows its actions as icon buttons the moment Select is on,
disabled when they do not apply rather than appearing and vanishing. On a phone
the right-hand group could not wrap and ran 130 px off the screen.

Streamed downloads no longer freeze after one chunk. `registration.active` says
a worker exists, not that this page is controlled by it — and an uncontrolled
page's requests never reach its fetch handler, so the worker took the stream and
was never asked for it, leaving `writer.write()` waiting on backpressure that
would never lift. The page now requires control and the worker confirms it
actually served the request before the sink is trusted.

Fixed on the way: `setActionsOpen` outlived the state it belonged to and threw
on every Files action; the chat scrollbar stopped short of the bottom; the
owner's row sat lower than the rest; About showed a version hardcoded two
releases ago.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
index 0e4427d..25c1f6c 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -389,4 +389,21 @@ export default {
     other: '{n} files found',
   },
   'search.hint': 'Search file names across all cached group indexes.',
+
+  // Presence, chat paging, leaving a group, the profile page
+  'presence.online': 'A node serving this group is online',
+  'presence.offline': 'No node is reachable for this group',
+  'presence.unknown': 'Not checked yet',
+  'chat.load_older': 'Load {n} older messages',
+  'chat.start_of_history': 'Beginning of the conversation',
+  'chat.today': 'Today',
+  'chat.yesterday': 'Yesterday',
+  'chat.unread': 'New messages',
+  'chat.jump_latest': 'Jump to latest',
+  'chat.jump_new': 'New messages',
+  'group.leave': 'Leave group',
+  'group.leave_confirm': 'Leave “{name}”? You will lose access to its files and chat. Files you uploaded stay on the node, and the node keeps the identity it pinned for you until its operator removes it.',
+  'profile.title': 'Profile',
+  'usermenu.profile': 'Profile',
+  'create_group.public_is_open': 'Anyone can find and join a public group. To choose who comes in, make it private.',
 };