Start daemon connection before first-run onboarding

[coneilen]

Summary

Part of #556. Start the daemon client connection independently before the modal first-run onboarding sequence, without changing onboarding UI implementation or closing the issue.

Changes

• Register the daemon callback and schedule DaemonClient.connect() before a genuine first-run modal enters its message loop.
• Preserve the existing late connection point for ordinary startup, smoke hooks, supervisor hooks, and UIA gate startup.
• Add focused behavioral coverage for connection-before-modal ordering and the non-first-run deferral path.

Test plan

RED: & $env:GRAPHCODE_ZIG0152 test src\App.zig src\AccessibilityProvider.cpp src\FilePicker.c $wing -DUNICODE -D_UNICODE -target x86_64-windows-msvc -lc -luser32 -lgdi32 -lgdiplus -lmsimg32 -lopengl32 -lkernel32 -limm32 -lole32 -loleaut32 -luiautomationcore -lshell32 -ladvapi32 -lwinhttp "-I$include" $vt --test-filter "first-run startup schedules daemon connection before the modal returns" -> expected .connection_scheduled, found .modal_entered; 0 passed, 1 failed
GREEN: & $env:GRAPHCODE_ZIG0152 test src\App.zig src\AccessibilityProvider.cpp src\FilePicker.c $wing -DUNICODE -D_UNICODE -target x86_64-windows-msvc -lc -luser32 -lgdi32 -lgdiplus -lmsimg32 -lopengl32 -lkernel32 -limm32 -lole32 -loleaut32 -luiautomationcore -lshell32 -ladvapi32 -lwinhttp "-I$include" $vt --test-filter "first-run startup schedules daemon connection before the modal returns" -> 1/1 passed
REGRESSION: & $env:GRAPHCODE_ZIG0152 test src\App.zig src\AccessibilityProvider.cpp src\FilePicker.c $wing -DUNICODE -D_UNICODE -target x86_64-windows-msvc -lc -luser32 -lgdi32 -lgdiplus -lmsimg32 -lopengl32 -lkernel32 -limm32 -lole32 -loleaut32 -luiautomationcore -lshell32 -ladvapi32 -lwinhttp "-I$include" $vt -> 731/731 passed on rerun; initial run was 730/731 because an unrelated foreground-sensitive overview test failed, then passed 1/1 in isolation

Native package install, first-launch onboarding, keyboard operation, and UI Automation were not run. This PR does not claim those acceptance criteria.

Remaining layer 2 acceptance criteria: expose named keyboard-operable UIA pages and actions with deterministic focus, preserve modal foreground/ownership/teardown, and exercise package install through first launch, onboarding, and connected Welcome using native keyboard and UIA.

Checklist

• I have read the Contributing Guidelines
• I have signed off my commits (git commit -s) per the DCO
• Tests pass locally (make test)
• Code follows the existing style (make check)
• I added the test/contract before the implementation and observed the intended RED failure