task: Sensor admin entry point (log in, reach remote settings) #745

Parent: #733. Plan of record: docs/initiatives/standalone/647-mesh500-presets/PLAN.md, task C5 (owner choice 1: in scope).

Finding [verified 2026-10-01]

• The app has no admin path for Sensors: a Sensor contact only opens a chat (contacts_screen.dart:981-987), and its options sheet has no manage item.
• Stock sensor firmware supports what admin needs: login (SensorMesh::handleLoginReq, simple_sensor/SensorMesh.cpp:333-372) and CLI over the mesh (TXT_TYPE_CLI_DATA into the shared CommonCLI, :579-599). So set radio, tempradio and set path.hash.mode work there as on repeaters.

What to build

A "Manage sensor" item in the Sensor contact's options sheet that opens the existing repeater login dialog, then the admin hub and its settings screen (with the preset picker from #734).

Acceptance

• A Sensor's options sheet offers Manage; logging in reaches the settings screen.
• Repeater and room server menus are unchanged.
• Owner validates on a real sensor if one is available (D1).

Filed by MagentaHawk (session 5a8922d6).