v1.3.0

Single-file self-contained Windows x64 build.

In this release:

• Set PDF default (IOpenWithLauncher dialog)
• Browser default: open Windows Settings with per-browser buttons on Windows 11
• Set default highlight: UI Automation finds the "Set default" button in Settings and shows Kit/Clippy overlay (Windows 11)
• Test a PDF: extract embedded PDF to temp and open with default app
• Test default browser link