[3/3] Highlighter styling (#1490)
This PR finalises the highlighter shape with new colors, sizing, and
perfect freehand options.
The colors are based on our existing colour palette, but take advantage
of wide-gamut displays to make the highlighter highlightier. I used my
[oklch color palette tool to pick the
palette](https://alex.dytry.ch/toys/palette/?palette=%7B%22families%22:%5B%22black%22,%22grey%22,%22white%22,%22green%22,%22light-green%22,%22blue%22,%22light-blue%22,%22violet%22,%22light-violet%22,%22red%22,%22light-red%22,%22orange%22,%22yellow%22%5D,%22shades%22:%5B%22light-mode%22,%22dark-mode%22,%22hl-light%22,%22hl-dark%22%5D,%22colors%22:%5B%5B%5B0.2308,0,null%5D,%5B0.9097,0,null%5D,%5B0.2308,0,null%5D,%5B0.2308,0,null%5D%5D,%5B%5B0.7692,0.0145,248.02%5D,%5B0.6778,0.0118,256.72%5D,%5B0.7692,0.0145,248.02%5D,%5B0.7692,0.0145,248.02%5D%5D,%5B%5B1,0,null%5D,%5B0.2308,0,null%5D,%5B1,0,null%5D,%5B1,0,null%5D%5D,%5B%5B0.5851,0.1227,164.1%5D,%5B0.5319,0.0811,162.23%5D,%5B0.8729,0.2083,173.3%5D,%5B0.5851,0.152,173.3%5D%5D,%5B%5B0.7146,0.1835,146.44%5D,%5B0.6384,0.1262,143.36%5D,%5B0.8603,0.2438,140.11%5D,%5B0.6082,0.2286,140.11%5D%5D,%5B%5B0.5566,0.2082,268.35%5D,%5B0.4961,0.1644,270.65%5D,%5B0.7158,0.173,243.85%5D,%5B0.5573,0.178,243.85%5D%5D,%5B%5B0.718,0.1422,246.06%5D,%5B0.6366,0.1055,250.98%5D,%5B0.8615,0.1896,200.03%5D,%5B0.707,0.161,200.03%5D%5D,%5B%5B0.5783,0.2186,319.15%5D,%5B0.5043,0.1647,315.37%5D,%5B0.728,0.2001,307.45%5D,%5B0.5433,0.2927,307.45%5D%5D,%5B%5B0.7904,0.1516,319.77%5D,%5B0.6841,0.1139,315.99%5D,%5B0.812,0.21,327.8%5D,%5B0.5668,0.281,327.8%5D%5D,%5B%5B0.5928,0.2106,26.53%5D,%5B0.5112,0.1455,26.18%5D,%5B0.7326,0.21,20.59%5D,%5B0.554,0.2461,20.59%5D%5D,%5B%5B0.7563,0.146,21.1%5D,%5B0.6561,0.0982,20.86%5D,%5B0.7749,0.178,6.8%5D,%5B0.5565,0.2454,6.8%5D%5D,%5B%5B0.6851,0.1954,44.57%5D,%5B0.5958,0.1366,46.6%5D,%5B0.8207,0.175,68.62%5D,%5B0.6567,0.164,68.61%5D%5D,%5B%5B0.8503,0.1149,68.95%5D,%5B0.7404,0.0813,72.25%5D,%5B0.8939,0.2137,100.36%5D,%5B0.7776,0.186,100.36%5D%5D%5D%7D&selected=3).
I'm not sure happy about these colors as they are right now - in
particular, i think dark mode looks a bit rubbish and there are a few
colors where the highlight and original version are much too similar
(light-violet & light-red). Black uses yellow (like note shape) and grey
uses light-blue. Exports are forced into srgb color space rather than P3
for maximum compatibility.
The size of a highlighter stroke is now based on the text size which
works nicely for making the highlighter play well with text:
Perfect freehands settings are very similar to the draw tool, but with
the thinning turned way down. There is still some, but it's pretty
minimal.
### The plan
1. initial highlighter shape/tool #1401
2. sandwich rendering for highlighter shapes #1418
3. shape styling - new colours and sizes, lightweight perfect freehand
changes #1490 **>you are here<**
### Change Type
- [x] `minor` — New Feature
### Test Plan
1. You can find the highlighter tool in the extended toolbar
2. You can activate the highlighter tool by pressing shift-D
3. Highlighter draws nice and vibrantly when over the page background or
frame background
4. Highlighter is less vibrant but still visible when drawn over images
/ other fills
5. Highlighter size should nicely match the corresponding unscaled text
size
6. Exports with highlighter look as expected
### Release Notes
Highlighter pen is here! 🎉🎉🎉
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Co-authored-by: Steve Ruiz <steveruizok@gmail.com>
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