Modernize DockPin for v2.2

[green2grey]

Summary

• Fix event-tap shared state with a lock-protected snapshot and explicit CFMachPort invalidation.
• Replace Dock edge polling with Dock preference distributed notifications.
• Add SwiftUI status popover and setup panel while preserving existing profile, reachability, and re-anchor behavior.
• Add v2.2 plist metadata, Sparkle 2.9.2, strict concurrency setting, profile error logging, and hardened signing/notarization script.

Testing

• git diff --check HEAD~2..HEAD passed.
• python3 -c "import plistlib; ..." passed and confirmed v2.2/220 plus required plist keys.
• bash -n build.sh passed.
• swift package dump-package passed and confirmed tools 5.10 plus Sparkle lower bound 2.9.2.
• swift build -c release was attempted but this Linux cloud runner lacks the macOS Cocoa module.
• swift build -c release -Xswiftc -warnings-as-errors -Xswiftc -strict-concurrency=complete was attempted but this Linux cloud runner lacks the macOS Cocoa module.
• DOCKPIN_SIGN_ID='Developer ID Application' ./build.sh was attempted and now fails clearly because this runner lacks macOS security/codesign tooling.

  

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