New resource bar components w/ keyboard controls

[rsek]

introduces a more unified set of components that are friendly to both Actors and Items.

it also fixes the missing "selected" highlight on the starforged theme (not totally sure when it happened, but a player in one of my co-op games pointed it out).

• the slider role; spinbutton is probably a valid choice here too, TBH, but neither is fully satisfactory. might change my mind again later
• full keyboard control for slider widgets (when they have focus), generally adhering to WC3 recs
• readonly mode: renders the same slider as a 'readonly' preview, for use in e.g. the asset browser
• assertive styling for the slider :focus selector
• collapse "burn momentum" button into the momentum label (with an explanatory tooltip), which should make things nicer for locales that needed to fit more than 4 characters into the 'Burn' button
• hovering the burn momentum button highlights the box with the PC's momentum reset value
• following the style on the SF printable sheet, omits the + signs from resources that don't have negative values (e.g. everything but momentum)
• replace remaining AssetTrack and Stack instances (where they represent resource bars)
• fake a text-stroke (at least until chromium fixes the bug) to ensure legibility on highlighted bar segments with the SF theme

ideas for further expansion/refinement:

• debounce multiple rapid increments/decrements in chat messages
• compact mode: renders the same slider as a spinner
• consider cribbing some styling from the SF sheet (the overlapping arrows are kinda fun -- might mean bring SVG in)
• note keybindings in tooltip -- need to consider the best way to style the tooltips here, as currently they'd be rather large.

[ben]

I like this a lot, just a few things I noticed. And a reminder that the shared-supply feature got left behind.

[ben]

Maybe now is when can trim this. We already indicate the max by disabling the high numbers, so this is just left over from the paper sheet.

[rsek]

huh, yeah, the same thing crossed my mind. we might even take it a step further by marking the reset value with an icon of some kind, and ditching that label, too. it's also conveyed in the burn button tooltip.

[ben]

🌶️ 😀

[ben]

Getting closer, just a few more comments

[ben]

LGTM, merge whenever you're ready.