feat: omarchy-beeper bar widget for unread Beeper chats

CHANGELOG.md

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+# Changelog
+
+## 1.0.0
+
+First release.
+
+- Bar icon: stroked chat bubble with an unread-chat badge in the bar
+  foreground colour, dimmed to half opacity when Beeper Desktop is unreachable.
+- Panel: one row per unread chat across every connected network, newest first,
+  with the network as a chip when more than one account is connected.
+- Click a row (or `Enter`/`Space`/`o`) to focus that chat in Beeper Desktop and
+  mark it read; the row disappears immediately and the mark is queued.
+- `a` marks the row under the cursor read without opening it. `A` marks every
+  unread chat read behind a two-press confirm, with a 100-second budget and a
+  partial count.
+- Paging with `n`/`p`, page size 1–50, poll interval 15–3600 s.
+- `bin/omarchy-beeper` CLI: `list`, `read`, `read-all`, `open`, `auth`. Every
+  command prints one JSON object and exits 0.
+- Muted, archived, and low-priority chats are excluded from the pile.
+- Token stored at `~/.config/omarchy-beeper/secrets/token.json` (600, in a 700
+  directory), read with `O_NOFOLLOW`, never passed in argv.
+- All HTTP bound to `http://localhost:23373/v1/`, no redirects, 2 MiB body cap
+  and 64 KiB error cap, 30 s per request.
+- Read and mark-read only: the plugin never sends a message.