feat(auto-input): add pointer HUD position

[xcv58]

Summary

• add a persisted At Pointer position for the interactive Auto Input HUD
• snapshot the pointer on presentation and clamp the clickable HUD within the pointer display
• expose the Interactive HUD dependency with localized hover, contextual, keyboard, and VoiceOver guidance
• add focused coverage for persistence, dependency fallback, pointer snapshots, display edges, and click cycling

Verification

• Swift source and tests parse successfully
• changed HUD, model, and settings sources type-check successfully against MacToolsPluginKit
• localization catalog validates with jq
• git diff --check passes
• targeted XCTest execution was not available because the environment has Command Line Tools but no Xcode installation

Closes #321