fix(library): visible test-connection feedback + truthful reachability

[keyldev]

• editor: test status moved to its own full-width row (was ellipsized to 0px on phones)
• editor: test session uses the RtspTransport user setting, like live view
• probe RTSP URI host instead of the Host field
• re-probe reachability on every library page Loaded, not just first load

Summary

• editor: test status moved to its own full-width row (was ellipsized to 0px on phones)
• editor: test session uses the RtspTransport user setting, like live view
• probe RTSP URI host instead of the Host field
• re-probe reachability on every library page Loaded, not just first load

Related

Type

• Bug fix
• Feature
• Refactor / cleanup
• Docs / CI
• Other:

Checklist

• Builds with 0 warnings (TreatWarningsAsErrors=true).
• Tests pass (dotnet test); new Core logic has unit tests.
• No layering violation — App references Core only (Infrastructure / Video / Devices wired via DI in a head).
• Scope stays within one phase (didn't pull work from a later phase's "Не входит").
• README / docs updated if public commands, options, or setup changed.

Platforms tested

• Windows
• Linux
• macOS
• Android
• iOS
• CI build only

Screenshots / notes