- Replace global _last_reply float with _last_reply_per_sender dict.
A reply to one node no longer blocks all other senders for 5 s.
LRU eviction keeps the dict bounded at 200 entries.
- _get_active_channels() now falls back to BotConfig defaults when
the stored channel set is empty (user never saved a selection).
Bot was silently deaf on first run despite the panel showing all
channels pre-checked.
Closes: bot only replies to first sender in multi-node #test session.
WHAT: New ＋ Add Channel button in the Messages submenu opens a dialog
supporting three modes — Hashtag (key derived from name), Private New
(random key + QR export), Private Existing (paste hex key).
WHY: Channels could only be added via firmware/external tools. The new
dialog covers all user scenarios without changing the BLE worker or
existing panels.
NOTES: Requires `qrcode[pil]` for QR rendering (graceful degradation if
absent). Channel re-discovery is triggered automatically on success.
WHAT: New BotPanel replaces the BOT checkbox in ActionsPanel. Interactive
channel checkboxes (from live device channel list) replace the hardcoded
BOT_CHANNELS constant. Private mode restricts replies to pinned contacts only.
BotConfigStore persists settings per device to ~/.meshcore-gui/bot/.
WHY: Bot configuration was scattered (toggle in Actions, channels in code).
A dedicated panel and config store aligns with the BBS panel/BbsConfigStore
pattern and enables private mode without architectural changes.
NOTES: ActionsPanel.__init__ signature simplified (set_bot_enabled removed).
create_worker accepts pin_store kwarg (backwards compatible, defaults to None).
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