Improve AF compatibility across different camera HAL implementations and Implement independent AF/AE metering and draggable indicators

[matthew777777]

Summary

This PR improves the camera focus and exposure controls by separating AF and AE metering, correcting coordinate mapping, refining capture-request behavior, and improving manual-focus handling.

Changes

• Added a separate draggable exposure indicator with a sun icon, allowing the AE metering point to be positioned independently from the autofocus indicator.
• Updated TouchFocus to coordinate independent AF and AE metering points.
• Refined AF/AE trigger logic in CaptureController to:
  • Prevent redundant AF and AE restarts.
  • Avoid unnecessary request updates.
  • Improve compatibility across different camera HAL implementations.
• Reworked viewfinder-to-sensor coordinate mapping:
  • Uses SENSOR_INFO_ACTIVE_ARRAY_SIZE.
  • Correctly accounts for the active sensor region.
  • Fixes inaccurate AF/AE region placement caused by incorrect view-to-sensor translation.
• Applied the selected manual focus distance to still-capture requests, ensuring captured images use the same focus setting as the preview.
• Improved focus-range and hyperfocal-distance handling in CameraProperties, including more reliable behavior when camera metadata is incomplete or device-specific.
• Updated AF state labels and related UI constants for clearer and more consistent focus-state reporting.

Result

AF and AE can now be controlled independently and positioned more accurately. Manual focus is preserved during still capture, focus-distance calculations are more robust, and the updated trigger logic reduces unnecessary focus restarts while improving compatibility across devices.