feat: format trim times as MM:SS.d instead of raw seconds

[Youngmaster0304]

What this does

Formatted trim times as MM:SS.d instead of raw seconds.

Why

Displaying time in raw seconds (e.g., 65.5) is not user-friendly. MM:SS.d format (e.g., 01:05.5) is more intuitive.

Changes

• Added formatTimeWithDecimal helper function in src/lib/utils.ts
• Updated trim control labels to show formatted time
• Inputs still accept numeric seconds for editing

Acceptance Criteria

• Duration shown as MM:SS format
• Trim input labels show formatted time
• Inputs still accept numeric seconds for editing

Contributor

Abhinav Jha (@Youngmaster0304) | abhinavjha0304@gmail.com
GSSoC 2026 Participant

Fixes #78

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👋 Thanks for your PR, @Youngmaster0304!

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🟠 GSSoC'26 PR detected — thanks for contributing under GirlScript Summer of Code 2026!

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[magic-peach]

Thanks for the contribution! Another open PR (#1570: fix: format trim times as minutes and seconds) tackles the same issue and is a bit further along (cleaner CI / no merge conflicts), so I'm consolidating there to keep review focused in one place. Closing this one — no reflection on the work itself, just avoiding split review across duplicates. Feel free to bring anything over to #1570 if it adds something that one doesn't have yet!