Name every icon by the pixel grid it is drawn for

Groundwork for redrawing the icons on their pixel grids. A name is now
<icon><px> (server14, server16, server24) and must match the size token
where it renders: 14 at --icon-size-sm, 16 at -md, 24 at -xl.
tdesignLoading is the one exception, since it spins. Every name not yet
redrawn aliases its TDesign glyph, so nothing changes on screen except
the manager-open overlay icon, which moves from lg to xl ("a status
mark on a card").

- pixel-icons.ts holds the redrawn glyphs, so far add14 (the + from
  3f7145d, renamed from pixelAdd).
- TS code that picks icons takes Icon14 / Icon16 (menu items, file
  glyphs, the copy arrow, toasts, transfer states), so build:ui
  rejects a wrong name.
- icons.spec.ts checks every <ng-icon> in the skins: it has a size
  token, and each literal name, both sides of a [name] ternary
  included, is registered and drawn for that token's grid.
- TDesign's file1 is now fileText, since file1 plus a suffix would
  read file114.

Co-Authored-By: Claude <noreply@anthropic.com>

ui/src/app/skins/shadlike/app.html

@@ -2,7 +2,7 @@
   @if (!rpc.available) {
     <div class="flex flex-1 items-center justify-center">
       <div class="max-w-sm border border-border bg-card p-6 text-center shadow-sm">
-        <ng-icon name="tdesignCloseCircle" size="var(--icon-size-xl)" class="text-destructive" />
+        <ng-icon name="closeCircle24" size="var(--icon-size-xl)" class="text-destructive" />
         <p class="mt-2 text-sm font-medium">{{ i18n.t('app.notConnectedTitle') }}</p>
         <p class="mt-1 text-xs text-muted-foreground">
           {{ i18n.t('app.notConnectedBody') }}
@@ -28,7 +28,7 @@
       (mousedown)="focusManager()"
     >
       <div class="border border-border bg-card px-5 py-4 text-center shadow-xl">
-        <ng-icon name="tdesignServer" size="var(--icon-size-lg)" class="text-muted-foreground" />
+        <ng-icon name="server24" size="var(--icon-size-xl)" class="text-muted-foreground" />
         <p class="mt-1.5 text-xs text-muted-foreground">{{ i18n.t('app.managerOpen') }}</p>
         <button
           (click)="focusManager()"