Proposal: Be smarter about quality level when converting images to JPGs

[Novaenia]

When the Bluesky app converts an image to a JPG, it first starts at a quality level of 100%. If the resulting file is above the file size limit of 1MB, it drops the quality by 10% and tries again.

social-app/src/lib/media/manip.ts

Lines 181 to 183 in ab4e361

	for (let i = 0; i < 9; i++) {
	// nearest 10th
	const quality = Math.round((1 - 0.1 * i) * 10) / 10

Each quality drop has diminishing returns - it is not linear. Often, going from 100% to 98-99% can shave off 25 to 30% of the size saved at 100% quality. Even just around 96% can result in a file that's less than half of the 100% size. Jumping from 100% to 90% sacrifices an unnecessary amount of quality. Here's a chart from Wikipedia.

I think this loop should be changed, so that every single quality level from 100% down to 100% is tested.

Sidenote: The <2000x2000 & <1MB constraint on images sucks anyway! It would be swell if it were to be raised.