fix(icons): the "Wanted" button asked for a Pro icon

`bookmark-check` is Font Awesome **Pro**, so it was never bundled and
`window.__yjIconMisses` has held it for as long as anything could be
requested — the button rendered the missing-icon fallback in the one
state it exists to show.

`offline-icons.spec.ts` asserts that array is empty and passed anyway:
no spec had ever put the app in a state where an album is requested. A
name computed from state is only checkable from that state, which is
the case `names.txt` exists for.

Outline and solid of the same Free glyph carry the toggle instead,
which is what the vendoring script tells you to do when a name is
missing: pick one that is Free, never reach for the Pro file.

frontend/src/assets/icons/fa/regular/bookmark.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><!--! Font Awesome Free 7.3.1 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2026 Fonticons, Inc. --><path fill="currentColor" d="M0 64C0 28.7 28.7 0 64 0L320 0c35.3 0 64 28.7 64 64l0 417.1c0 25.6-28.5 40.8-49.8 26.6L192 412.8 49.8 507.7C28.5 521.9 0 506.6 0 481.1L0 64zM64 48c-8.8 0-16 7.2-16 16l0 387.2 117.4-78.2c16.1-10.7 37.1-10.7 53.2 0L336 451.2 336 64c0-8.8-7.2-16-16-16L64 48z"/></svg>

frontend/src/components/explore-album-details/explore-album-details.ts

@@ -1889,9 +1889,14 @@ export class ExploreAlbumDetails extends LitElement {
                 appearance=${this.isRequested ? 'filled' : 'outlined'}
                 @click=${() => void this.toggleRequested(request?.id)}
             >
+                <!-- The requested state used to ask for bookmark-check,
+                     which is a Font Awesome *Pro* name: never bundled,
+                     so this button has rendered the missing-icon
+                     fallback in that state ever since. Outline and solid
+                     of the same Free glyph carry the toggle instead. -->
                 <wa-icon
                     slot="start"
-                    name=${this.isRequested ? 'bookmark-check' : 'bookmark'}
+                    name=${this.isRequested ? 'solid/bookmark' : 'regular/bookmark'}
                 ></wa-icon>
                 ${this.isRequested ? 'Wanted' : 'Want this'}
             </wa-button>

frontend/src/icons/names.txt

@@ -22,6 +22,7 @@ solid/arrow-rotate-right
 solid/arrows-rotate
 solid/arrow-up-short-wide
 solid/backward-step
+regular/bookmark
 solid/bookmark
 solid/box-open
 solid/check