Polish and add aborting to several input widgets: no Esc closing parent menus; color picker axis align; repeat on arrow buttons (#2276)

* Remove color input outline; reduce antialiasing compositing artifacts in color widgets

* Rename ColorButton to ColorInput

* Add features and aborting to several other widgets

- Prevent Esc from closing parent floating menus when aborting
- Fix missing icon regression
- Gutter resizing abort
- Color picker aborts, Shift axis alignment, improve click/drag behavior for gradient spectrum
- Scrollbar abort, repeat when held, fix directional arrows when viewport is zoomed
- Number input abort, repeat when held

* Move ColorInput into the inputs folder

* Fix tiny logo

frontend/src/components/panels/Layers.svelte

@@ -435,7 +435,7 @@
 							title={listing.entry.expanded ? "Collapse" : `Expand${listing.entry.ancestorOfSelected ? "\n(A selected layer is contained within)" : ""}`}
 							on:click|stopPropagation={() => handleExpandArrowClick(listing.entry.id)}
 							tabindex="0"
-						/>
+						></button>
 					{/if}
 					<div class="thumbnail">
 						{#if $nodeGraph.thumbnails.has(listing.entry.id)}