p#682 Improve logging for system events and session

[akleshchev]

The important bits are watchdog specific and SetThreadDescription

[Copilot]

Pull request overview

This PR enhances runtime observability for Windows/system events and session behavior by adding more watchdog pings/logging around Win32 message handling, passing device-change context through the window callback API, and improving debugging ergonomics (thread naming).

Changes:

• Extend handleDeviceChange callbacks to include a change_type string, and log device/display changes in the viewer.
• Add additional watchdog “ping” points around key Win32 window messages and introduce LLWatchdogTimeout::started().
• Adjust second-instance voice behavior to disable voice only for the current session (with additional debug logging).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
indra/newview/llviewerwindow.h	Updates device-change callback signature to include change_type.
indra/newview/llviewerwindow.cpp	Logs device/display change events and adapts to new callback signature.
indra/newview/llappviewer.cpp	Tweaks second-instance voice disabling logic and adds debug logging.
indra/llwindow/llwindowwin32.cpp	Adds watchdog pings for Win32 messages, expands event logging, and sets a thread description.
indra/llwindow/llwindowcallbacks.h	Updates callback interface for device-change change_type.
indra/llwindow/llwindowcallbacks.cpp	Updates default callback implementation signature for device-change change_type.
indra/llui/llfloater.cpp	Adds a TODO note about per-frame visibility control overhead.
indra/llcommon/llwatchdog.h	Adds started() to the watchdog interface and timeout implementation.
indra/llcommon/llwatchdog.cpp	Implements LLWatchdogTimeout::started().

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