Security & Theme Improvements

[valentinfrlch]

1.5.1 Release Candidate 1 Release Notes

🔧 Improvements & Fixes

• Secure Snapshot access: Snapshots are now stored securely in /media/llmvision/snapshots behind Home Assistant authentication. (@valentinfrlch)
• Added Caching: Snapshots are now cached to reduce the amount of refreshes and improve overall performance. Card refreshes several times per second #40 (@valentinfrlch)
• Enhanced Theme support: Improved style variables for better compatibility (@valentinfrlch)

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