fix(windows): recalculate hit-test regions on DPI change for frameless windows

[leaanthony]

Summary

• Fixes frameless transparent window hit-test regions not updating after DPI change on Windows
• When moving a frameless transparent window between monitors with different DPI settings, the right and bottom edges would become unresponsive to clicks

Changes

• Add SWP_FRAMECHANGED flag to SetWindowPos in WM_DPICHANGED handler for frameless windows to trigger WM_NCCALCSIZE and recalculate hit-test regions
• Re-extend DWM frame into client area for frameless windows with decorations after DPI change

Root Cause

The WM_DPICHANGED handler was resizing the window but not triggering WM_NCCALCSIZE, which is needed to recalculate the non-client area and hit-test regions.

Test plan

• Create a Wails app with Frameless: true and BackgroundType: application.BackgroundTypeTransparent
• Set up multi-monitor environment with different DPI settings (e.g., 1.25x and 1.75x)
• Move the window between monitors
• Verify that all edges remain responsive to mouse clicks after DPI change

Fixes #4691

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between b1dd5a4 and 07211b4.

📒 Files selected for processing (2)

• v3/UNRELEASED_CHANGELOG.md (1 hunks)
• v3/pkg/application/webview_window_windows.go (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-4691-dpi-hittest-regions

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