feat: Add reliable animated image support for both the configuration UI and physical device output

[flagadajones]

…g logic

Preflight checklist

• [X ] I understand that if this pull request is about support for non-Elgato or non-Tacto hardware, it will be closed without explanation, as per issue Statement regarding device support #38.
• [X ] I have ensured that I have run the appropriate formatter on my changes and that my code produces no linter violations.
• [X ] I have thoroughly reviewed the diff of my changes and ensured that I have neither introduced any unrelated additions, nor differences in unmodified code.
• [X ] I will keep "Allow edits from maintainers" enabled for this pull request.

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Goal

Add reliable animated image support for both the configuration UI and physical device output, while hardening the rendering pipeline.

Main Changes

• Enabled gif and webp decoding support in the Rust backend (image crate features).
• Preserved animated uploads (avoids flattening animated files into a single static frame).
• Reworked frontend rendering:
  • Frame-by-frame decoding via ImageDecoder (WebCodecs) when available.
  • Time-driven animation loop that respects per-frame durations.
  • Shared global animation clock to keep all animated keys on the same page synchronized.
• Improved device update path:
  • Dedicated throttled device rendering/send flow.
  • Backpressure to prevent overlapping frame sends and reduce flip/flop artifacts.
  • Separate canvas for device output to isolate UI rendering from hardware updates.
• Lifecycle cleanup improvements:
  • Explicit animation cleanup on rerender/state changes/component destroy.
• Updated editor preview handling to match the new renderer return type.

Expected Outcome

• Animated GIF/WebP files render correctly in the configuration UI.
• More stable and consistent animation behavior on hardware.
• Animations on the same page stay synchronized.
• Fewer visual artifacts caused by update burst/ordering issues.

Impact

• 5 files changed

Validation

• deno task check ✅
• deno lint ✅

[CLAassistant]

All committers have signed the CLA.