Show camera preview in calibration

[connorgallopo]

Description

What does this PR do?

Why is this change needed?

Related Issue(s)

Closes #

Changes Made

Testing Performed

Test Environment

• Pi Model:
• Camera Type:
• OS Version:
• Installation Method:

Test Results

• pitrac test hardware passes
• pitrac test camera passes (if camera-related)
• pitrac test pulse passes (if strobe-related)
• Simulator integration tested with:
• Performance metrics:

Test Commands Run

# Paste the actual commands and output

Performance Impact

• Before:
• After:
• Impact:

Breaking Changes

• This PR includes breaking changes
  • What breaks:
  • Migration steps:

Dependencies

• No new dependencies

• [ ] New dependencies added:

• [ ] Updated dependencies:

Hardware Compatibility

• Tested on Pi 5
• Tested on Pi 4
• Tested with single Pi setup
• Tested with dual Pi setup

Documentation

• No documentation needed
• Documentation updated in this PR
• Documentation PR to follow
• Updated relevant sections:
  • README
  • Hardware guide
  • Software guide
  • Troubleshooting guide

Screenshots/Videos

Checklist

Code Quality

• Code follows existing patterns and conventions
• No unnecessary comments added
• Error handling implemented appropriately

Build & Test

• Successfully builds with ./packaging/build.sh build
• All existing tests pass
• New tests added for new functionality
• Tested on actual Raspberry Pi hardware (not just CI)

Submission Requirements

• Commits squashed if needed (git rebase -i HEAD~n)
• CLA signed
• PR title follows format: [PR TYPE] Brief description
• Branch is up-to-date with main

Additional Context

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