App Loader: Add dropdowns for sorting and filtering

[RKBoss6]

This stems from the discussion at #7920, where I had asked about having dropdowns for sorting and filtering, rather than a bunch of chips before. They got pretty messy with such a huge load of them on the screen, particularly for phones, so I made dropdowns instead. It's up on my app loader, and I have screenshots below. Any suggestions/feedback is very appreciated, check it out!
There is a JS component in appLoaderCore, which I'll try to get a PR for soon! Until then, I'm hoping we can discuss to make something everyone enjoys using.

Screenshots:

Before:

After:

[bobrippling]

Very nice!

[Copilot]

Pull request overview

This PR replaces the chip-based filtering and sorting UI with dropdown menus in the App Loader, aiming to reduce visual clutter especially on mobile devices. The changes introduce three new dropdowns for device type selection, app filtering, and sorting options, along with a relocated search form.

Changes:

• Replaced chip-based filter/sort controls with dropdown menus wrapped in a styled "pill" container
• Reorganized the search form to be inline with the dropdown controls
• Added CSS styling for dropdown menus, including positioning, z-index management, and the dropdowns-pill container
• Commented out the old chip-based UI implementation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 14 comments.

File	Description
index.html	Restructured the app library interface to use three dropdown menus (device type, filter, sort) instead of chips, moved search form into the dropdown container, and commented out old chip UI
css/main.css	Added styling for dropdown menus, menu items, dropdowns-pill container, search form flexbox layout, and dropdown positioning with z-index controls

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[gfwilliams]

I think we need to wait for espruino/EspruinoAppLoaderCore#87 to go in before we merge this? As we're just putting this in, please could you change <a sortid="explore">Random</a> to <a sortid="random">Random</a> (and the relevant bits in the EspruinoAppLoaderCore pr?)

... also the EspruinoAppLoaderCore pr still needs the indentation changing and that 'chips' is not defined error fixing

[gfwilliams]

We should really remove this rather than just commenting it out

[gfwilliams]

The idea of these is that New/Updated are hidden until we actually have the data to make them work - in the one you commented out <label class="chip hidden tooltip" sortid="created" data-tooltip="Most recent apps">New</label>you can see it says hidden

But at least in your app loader (https://rkboss6.github.io/BangleApps) this is now broken - appdates.csv can't be found but the menu items are still shown anyway, they just don't work.

I'm also a bit concerned that we had tooltips on all the items before so that people could hover and see what they actually meant - but you've deleted those?