fix(auto-input): keep pointer HUD text visible

[xcv58]

Summary

• Place the interactive At Pointer HUD above and to the left of the pointer so its text remains visible.
• Keep the pointer inside the bottom-right corner using a 10 pt inset for Compact and 12 pt for Standard and Large.
• Preserve display-edge clamping and update help text, documentation, all 11 localizations, and size-specific tests.

Testing

• InputSourceHUDControllerTests: 18 passed on macOS.