feat(now-playing): plain text instead of links in the phone mini player

The bottom bar's title, artist and "Playing from X" all navigate. In a
bar sized for a bar they are a few characters of text, which is not a
touch target — and explore-link holds its navigation for one
double-click interval and drops it if a second click arrives, a gesture
that exists so double-clicking a row can play it and that means nothing
on touch.

Below the shell's phone breakpoint the three render as plain text. The
words are unchanged: the source line still says where the queue came
from, because dropping the link is the change and dropping the
information would be a different and worse one. The cover art already
carries the phone-only button that opens the full-screen Now Playing
view, which is where the links live.

This is in JS rather than in the stylesheet because what changes is the
content, not its appearance — no CSS rule takes a click handler off an
element. matchMedia is read in connectedCallback for the reason the
reduce-motion query beside it already is, so a test can answer it first.

Two smaller things. PHONE_QUERY moves out of track-list.ts into
utils/breakpoints.ts: it was a private const when one component needed
it, and a second reader is where a copy starts drifting from index.css.
And `phone` joins geometryKey(), because crossing the breakpoint swaps a
link for a bare string and the marquee travels a distance read from
measuring it — the words being identical either side is not the same as
the box measuring the same.

Closes #61

frontend/src/components/now-playing/now-playing.ts

@@ -13,6 +13,7 @@ import {
     isQueueSourceNavigable,
     navigateToQueueSource,
 } from '@utils/queue-source-link';
+import { PHONE_QUERY } from '@utils/breakpoints';
 import { PlayerController } from '@store/controllers/player-controller';
 import { creditStore } from '@store/credit-store';
 import { QueueController } from '@store/controllers/queue-controller';
@@ -80,6 +81,19 @@ export class NowPlaying extends LitElement {
 
     private reduceMotionQuery?: MediaQueryList;
 
+    /**
+     * Phone width, from the shell's own breakpoint.
+     *
+     * This is in JS rather than in the stylesheet because what changes
+     * is the *content*, not its appearance: the title, artist and
+     * source render as plain text instead of as links, and no CSS rule
+     * can take a click handler off an element.
+     */
+    @state()
+    private phone = false;
+
+    private phoneQuery?: MediaQueryList;
+
     /** Whether each field is actively mid-scroll (class toggle). */
     @state()
     private titleScrolling = false;
@@ -341,6 +355,12 @@ export class NowPlaying extends LitElement {
         this.reduceMotion = this.reduceMotionQuery?.matches ?? false;
         this.reduceMotionQuery?.addEventListener('change', this.handleReduceMotionChange);
 
+        // Same reasoning as above: looked up here, not at module load,
+        // so a test can install its own matchMedia first.
+        this.phoneQuery = window.matchMedia?.(PHONE_QUERY);
+        this.phone = this.phoneQuery?.matches ?? false;
+        this.phoneQuery?.addEventListener('change', this.handlePhoneChange);
+
         this.resizeObserver = new ResizeObserver(() => {
             this.geometryDirty = true;
             this.requestUpdate();
@@ -364,6 +384,7 @@ export class NowPlaying extends LitElement {
         this.attachDragListeners(false);
         window.removeEventListener(SCROLL_CHANGE_EVENT, this.handleScrollModeEvent);
         this.reduceMotionQuery?.removeEventListener('change', this.handleReduceMotionChange);
+        this.phoneQuery?.removeEventListener('change', this.handlePhoneChange);
         this.resizeObserver?.disconnect();
         this.stopScrollCycle('title');
         this.stopScrollCycle('artist');
@@ -488,7 +509,7 @@ export class NowPlaying extends LitElement {
               @mouseleave=${this.handleTitleMouseLeave}
               @transitionend=${() => this.onScrollCycleEnd('title')}
             >
-              <span class="scroll-content">${trackLink(track.title, track.album, track.releaseGroupMbid, track.recordingMbid) || track.title}</span>
+              <span class="scroll-content">${this.phone ? track.title : trackLink(track.title, track.album, track.releaseGroupMbid, track.recordingMbid) || track.title}</span>
             </span>
             <span
               class="track-artist ${artistScrolling ? 'will-scroll' : ''} ${this.artistScrolling ? 'scrolling' : ''}"
@@ -498,14 +519,15 @@ export class NowPlaying extends LitElement {
               @mouseleave=${this.handleArtistMouseLeave}
               @transitionend=${() => this.onScrollCycleEnd('artist')}
             >
-              <span class="scroll-content">${creditLink(creditStore.credits(track.recordingMbid), track.artist, track.artistMbid) || 'Unknown Artist'}</span>
+              <span class="scroll-content">${this.phone ? track.artist || 'Unknown Artist' : creditLink(creditStore.credits(track.recordingMbid), track.artist, track.artistMbid) || 'Unknown Artist'}</span>
             </span>
             ${describeQueueSource(this.queue.source)
                 ? html`
                   <span
-                    class="track-source ${isQueueSourceNavigable(this.queue.source) ? 'navigable' : ''}"
+                    class="track-source ${!this.phone && isQueueSourceNavigable(this.queue.source) ? 'navigable' : ''}"
                     data-testid="now-playing-source"
                     @click=${(e: MouseEvent) => {
+                        if (this.phone) return;
                         if (!isQueueSourceNavigable(this.queue.source)) return;
                         navigateToQueueSource(
                             e.currentTarget as EventTarget,
@@ -571,6 +593,10 @@ export class NowPlaying extends LitElement {
         this.reduceMotion = e.matches;
     };
 
+    private handlePhoneChange = (e: MediaQueryListEvent): void => {
+        this.phone = e.matches;
+    };
+
     private shouldScroll(field: 'title' | 'artist'): boolean {
         const overflows = field === 'title' ? this.titleOverflows : this.artistOverflows;
 
@@ -606,6 +632,12 @@ export class NowPlaying extends LitElement {
             track?.artist ?? '',
             this.shouldScroll('title') ? '1' : '0',
             this.shouldScroll('artist') ? '1' : '0',
+            // Crossing the breakpoint swaps a link for a bare string,
+            // and a link is not guaranteed to measure the same as the
+            // text inside it. The marquee travels a distance read from
+            // that measurement, so this belongs in the key even though
+            // the words are identical either side.
+            this.phone ? '1' : '0',
         ].join('\u0000');
     }
 

frontend/src/components/track-list/track-list.ts

@@ -11,6 +11,7 @@ import {
 import { SelectionController } from '@utils/selection-controller';
 import type { SelectionHost } from '@utils/selection-controller';
 import { ViewLifecycleMixin } from '@utils/view-lifecycle';
+import { PHONE_QUERY } from '@utils/breakpoints';
 import {
     ContextMenuController,
     contextMenuStyles,
@@ -105,9 +106,6 @@ const ROW_CHROME_WIDTH =
 const ROW_HEIGHT = 33;
 const PHONE_ROW_HEIGHT = 52;
 
-/** The shell's phone breakpoint, as `index.css` and every component
- *  stylesheet spells it. */
-const PHONE_QUERY = '(max-width: 599px)';
 
 // Inline SVG paths for favorite icons — eliminates wa-icon shadow DOM
 // overhead (30-50 shadow roots during scroll).  Font Awesome 6 paths.

frontend/src/utils/breakpoints.ts

@@ -0,0 +1,23 @@
+/**
+ * The shell's breakpoints, where JavaScript has to agree with CSS.
+ *
+ * A media query inside a shadow root is answered by the viewport, so a
+ * component normally states what it drops at phone width in its own
+ * stylesheet and needs nothing from here. This exists for the cases
+ * where the decision is not a style: `track-list` computes its grid in
+ * JS from the host width, and `now-playing` renders *different content*
+ * on a phone — a plain string instead of a link — which no stylesheet
+ * can express.
+ *
+ * One breakpoint, several expressions of it. It was a private const in
+ * track-list.ts when there was one; a second reader is where a copy
+ * would start drifting from index.css.
+ */
+
+/**
+ * Phone width. 600px rather than the sidebar's 900px because 900 is a
+ * laptop: the answer there is a narrower sidebar, which is still a
+ * sidebar. Below this the shell drops the sidebar column entirely and
+ * bottom-nav takes over.
+ */
+export const PHONE_QUERY = '(max-width: 599px)';

frontend/test/components/now-playing-phone.test.ts

@@ -0,0 +1,166 @@
+/**
+ * The mini player's links are a desktop affordance.
+ *
+ * `utils/explore-link.ts` makes every track and artist name navigate,
+ * and `utils/queue-source-link.ts` makes "Playing from X" navigate — in
+ * the bottom bar those are a few characters of text at a font size
+ * chosen for a bar, which is not a touch target. Worse, explore-link
+ * holds the navigation for one double-click interval and drops it if a
+ * second click arrives: a gesture that exists so double-clicking a row
+ * can play it, and which means nothing at all on touch.
+ *
+ * So below the shell's phone breakpoint the three render as plain text
+ * and the whole bar's cover art opens the full-screen Now Playing view,
+ * which is where the links live.
+ *
+ * The breakpoint is stubbed rather than emulated for the reason
+ * track-list-phone.test.ts states: this tier's viewport is fixed at
+ * 1280x800 by the runner, and the component reads matchMedia in
+ * connectedCallback precisely so a test can answer it first.
+ */
+import { describe, expect, it, beforeEach } from 'vitest';
+
+import '@components/now-playing/now-playing';
+import { Events } from '../../src/events';
+import { emit, flush } from '@test/support/harness';
+import { fixture, shadow, shadowAll, text } from '@test/support/render';
+import type { TrackInfo } from '@store/player-store';
+import type { QueueTrack } from '@store/queue-store';
+
+const TRACK: TrackInfo = {
+  fileName: 'ashes.mp3',
+  filePath: '/music/ashes.mp3',
+  trackLength: 215,
+  seekPosition: 0,
+  state: 'playing',
+  title: 'Ashes to Ashes',
+  artist: 'David Bowie',
+  album: 'Scary Monsters',
+  coverArt: '',
+  coverArtSmall: '',
+  coverArtMedium: '',
+  coverArtLarge: '',
+  trackChangeId: 1,
+  artistMbid: '',
+  releaseGroupMbid: '',
+  recordingMbid: '',
+};
+
+function queueTrack(n: number, title: string): QueueTrack {
+  return {
+    id: n,
+    audioFileId: n,
+    filePath: `/music/${n}.mp3`,
+    position: n,
+    title,
+    artist: 'David Bowie',
+    album: 'Scary Monsters',
+    coverArtPath: '',
+    artistMbid: '',
+    releaseGroupMbid: '',
+    recordingMbid: '',
+  };
+}
+
+/** Mount the bar with the phone breakpoint answering `matches`. */
+async function mountAt(phone: boolean) {
+  const real = window.matchMedia.bind(window);
+
+  window.matchMedia = ((q: string) =>
+    q.includes('max-width: 599px')
+      ? {
+          matches: phone,
+          media: q,
+          addEventListener() {},
+          removeEventListener() {},
+        }
+      : real(q)) as typeof window.matchMedia;
+
+  try {
+    const el = await fixture('now-playing');
+
+    emit(Events.TrackChanged, { ...TRACK, trackChangeId: 20 });
+    emit(Events.QueueChanged, {
+      tracks: [queueTrack(1, 'Ashes to Ashes')],
+      currentIndex: 0,
+      source: { type: 'album', id: 7, label: 'Scary Monsters' },
+    });
+    await flush();
+    await el.updateComplete;
+
+    return el;
+  } finally {
+    window.matchMedia = real;
+  }
+}
+
+describe('the mini player on a phone', () => {
+  beforeEach(() => {
+    emit(Events.TrackChanged, { ...TRACK, trackChangeId: 1 });
+  });
+
+  it('renders the title and artist as plain text', async () => {
+    const el = await mountAt(true);
+
+    expect(shadowAll(el, '.explore-link').length).toBe(0);
+
+    // The words are unchanged — this is about what they are, not about
+    // hiding them. A fix that dropped the text would pass an assertion
+    // about links alone.
+    expect(text(el, '[data-testid="now-playing-title"]')).toContain(
+      'Ashes to Ashes',
+    );
+    expect(text(el, '[data-testid="now-playing-artist"]')).toContain(
+      'David Bowie',
+    );
+  });
+
+  it('does not navigate from the source line', async () => {
+    const el = await mountAt(true);
+    const source = shadow<HTMLElement>(el, '[data-testid="now-playing-source"]');
+
+    expect(source?.classList.contains('navigable')).toBe(false);
+
+    let navigated = false;
+    el.addEventListener('navigate', () => {
+      navigated = true;
+    });
+
+    source?.click();
+
+    expect(navigated).toBe(false);
+  });
+
+  it('still says where the queue came from', async () => {
+    const el = await mountAt(true);
+
+    // Dropping the *link* is the change; dropping the information would
+    // be a different and worse one.
+    expect(text(el, '[data-testid="now-playing-source"]')).toBe(
+      'Playing from Scary Monsters',
+    );
+  });
+
+  it('leaves the desktop bar exactly as it was', async () => {
+    const el = await mountAt(false);
+
+    expect(shadowAll(el, '.explore-link').length).toBeGreaterThan(0);
+
+    const source = shadow<HTMLElement>(el, '[data-testid="now-playing-source"]');
+
+    expect(source?.classList.contains('navigable')).toBe(true);
+
+    let detail: unknown;
+    el.addEventListener('navigate', (e) => {
+      detail = (e as CustomEvent).detail;
+    });
+
+    source?.click();
+
+    expect(detail).toEqual({
+      view: 'explore-album-details',
+      localAlbumId: 7,
+      albumName: 'Scary Monsters',
+    });
+  });
+});