Grid Picker for HID Usage

[awkannan]

This changes the HidUsagePicker to a grid-of-buttons style of input, similar to what we see in VIA or VIAL.
We keep the modifier toggles so people can still add modifiers to their keys too.

Some decisions I made:

• I'm changing "src/hid-usage-name-overrides.json" to "src/hid-usage-metadata.json". We have to categorize keys manually - so instead of making a 2nd json for categorization which basically had the same shape, I decided to just make the name overrides json a bit more generic. The idea is if we need to add anything else, i.e. icons - it can go in this file, which isn't just limited to name overrides
• On top of that - if something is going to be categorized in a way that shows it on the grid, we should consider how we want it to be shown on the grid. We should probably define a short name or medium name for these.
• We have 5 categories - Basic, Numpad, Apps/Media, ISO/JIS, and Other
• I used the categorization in the ZMK Docs

Some things I need help with:

• I used Gemini to help me with the CSS. I'm not great at tailwind, so I would love someone with more experience there to review the CSS. It all seems sensible to me, though.

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[awkannan]

Example.mp4

[peterjc]

Are you putting ISO keys like non-us-pound and non-us-backslash on basic?

[awkannan]

NUHS and NUBS are both under the ISO/JIS section at the moment

[peterjc]

Ah - a little cryptic so I missed them, but that's good. Thanks!

[joelspadin]

Would "International" be a better name for "ISO/JIS"?

[adminhxx]

Show "Key Press" in a virtual keyboard may be better, like https://hodgef.com/simple-keyboard/demos/?d=fullKeyboard. That's what I did in my fork, and it works very well.

[awkannan]

Show "Key Press" in a virtual keyboard may be better, like https://hodgef.com/simple-keyboard/demos/?d=fullKeyboard. That's what I did in my fork, and it works very well.

I think this could be a good improvement - but I don't want to add too much into this PR.

Right now, it's pretty easy to digest, but with the special-casing dropdown for the "Other" category, it's already a bit messier than I had hoped.

IMO - we should consider this in a subsequent PR. I think this one already moves the experience forward incrementally, and that would be a good incremental change on top of this.