fix: reuse one MQTT TLS session for TUI dashboard and monitor - #114
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BambuPrinter.hold_mqtt() keeps a single paho client for status, send_command, and get_version. The TUI caches one StatusService and releases the session on quit/unmount. One-shot CLI commands still connect and tear down. Reconnect cannot re-issue a published command.
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AAA stack 5/9. Stacked on #113.
The TUI was opening a new MQTT TLS session on every dashboard/monitor refresh.
BambuPrinter.hold_mqtt()/release_mqtt()keep one session;MqttSessionis the reusable connection.PlateAppreleases on quit/unmount so the paho loop thread does not leak (CI runs-W error::ResourceWarning).One-shot CLI commands still connect and tear down.
Stack: #110 → #111 → #112 → #113 → this → Textual 8 / 3.10 → test stubs → sole error path → honesty