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>

0 files changed, 0 insertions, 0 deletions