fix(core): ffmpeg version specific transient test failures

[andykais-claude]

Add almost_equals assertion and update media.test.ts to resolve transient FFmpeg-related float precision test failures.

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[andykais]

this can all be collapsed into

Suggested change

	const andrew_duration = groups_sorted_by_duration_desc.results[0].group.duration
	const alice_duration = groups_sorted_by_duration_desc.results[1].group.duration
	const bob_duration = groups_sorted_by_duration_desc.results[2].group.duration
	ctx.assert.not_equals(andrew_duration, undefined)
	ctx.assert.not_equals(alice_duration, undefined)
	ctx.assert.not_equals(bob_duration, undefined)
	ctx.assert.almost_equals(andrew_duration!, 16.733333, 0.01)
	ctx.assert.almost_equals(alice_duration!, 6.92, 0.1)
	ctx.assert.almost_equals(bob_duration!, 0, 0.001)
	ctx.assert.almost_equals(groups_sorted_by_duration_desc.results[0].group.duration!, 16.733333, 0.01)
	ctx.assert.almost_equals(groups_sorted_by_duration_desc.results[1].group.duration!, 6.92, 0.1)
	ctx.assert.almost_equals(groups_sorted_by_duration_desc.results[2].group.duration!, 0, 0.001)