Allow decimal custom playback speeds

[muttyqt15]

Summary

• allow the custom playback speed field to accept decimal values and sub-1 speeds
• preserve non-preset values like 1.1x instead of rounding them to whole numbers
• cover the input behavior with a focused component test

Root cause

The custom speed input stripped all non-digits with replace(/\D/g, "") and initialized non-preset values with Math.round(value), so values like 1.1 could not be entered or displayed correctly.

Impact

Users can enter decimal speeds like 1.1x, 0.9x, and other values up to 16x through the custom playback speed control, matching the existing 2-decimal playback speed model.

Validation

• npm test -- src/components/video-editor/CustomSpeedInput.test.tsx
• npx tsc --noEmit

Fixes #635.

[coderabbitai]

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[denisfilab]

nice work!

[siddharthvaddem]

this has been fixed already.