Unify button tooltips across the app (#972)

* feat(tooltip): 2s open delay and shared tooltipAttrs helper

Add a 2s hover open delay in TooltipPortal (single behaviour source) so
tooltips no longer flash on quick pointer passes; hiding stays immediate.
Add tooltipAttrs() to pair data-tooltip with a matching aria-label for
buttons touched in the unification work. Covered by Vitest.

* feat(tooltip): lower open delay to 1s

2s felt too long in testing; 1s gives the same anti-flash behaviour
without making intentional hovers wait.

* feat(tooltip): action tooltips on the artist overview

Add tooltips describing the action to Last.fm, Wikipedia, Play All,
Shuffle and Radio. Shuffle/Radio now show a tooltip on desktop too,
not just mobile. Strings added to all 9 locales.

* feat(tooltip): action tooltips on the album overview

Add tooltips describing the action to the desktop Play, Artist Bio and
Download (ZIP) buttons, matching the mobile layout. Strings added to all
9 locales.

* feat(tooltip): action tooltips on the All Albums toolbar

Add tooltips describing the action to the sort, year and genre filter
buttons. SortDropdown gains an optional tooltip prop; the year and genre
filter components carry their own, so the tooltips also appear on the
other browse pages that reuse them. Strings added to all 9 locales.

* feat(tooltip): action tooltips on song-list rows

Add Play and Add-to-queue tooltips to the per-row icons in SongRow, used
by the Tracks browse list, Search and Advanced Search. Also localizes the
aria-labels, which were hardcoded English. New common.addToQueue in all 9
locales.

* fix(tooltip): uniform tooltip placement on the Artists toolbar

The favourite and multi-select buttons forced tooltips below while the
view-mode buttons auto-flipped above, so the row looked inconsistent.
Pin the view-mode buttons below too, matching the rest of the row and the
Albums toolbar.

* feat(tooltip): clarify and align the Advanced Search scope row

Add a leading "Search in:" label and per-chip tooltips so the
All/Artists/Albums/Songs row reads as a scope limiter. Drop the forced
below-placement on the small star filter (used only here) so the
favourites chip flips with the others instead of sitting alone below.
Strings added to all 9 locales.

* docs(changelog): tooltip unification (#972)

src/components/AlbumHeader.tsx

@@ -18,6 +18,7 @@ import { formatLongDuration } from '../utils/format/formatDuration';
 import { formatMb } from '../utils/format/formatBytes';
 import { sanitizeHtml } from '../utils/sanitizeHtml';
 import { OpenArtistRefInline } from './OpenArtistRefInline';
+import { tooltipAttrs } from './tooltipAttrs';
 
 /** True when the album artist label means "no single artist" — `getArtistInfo`
  *  has nothing meaningful to return for these, so the Artist Bio entry is hidden.
@@ -323,7 +324,12 @@ export default function AlbumHeader({
               ) : (
                 <div className="album-detail-actions">
                   <div className="album-detail-actions-primary">
-                    <button className="btn btn-primary" id="album-play-all-btn" onClick={onPlayAll}>
+                    <button
+                      className="btn btn-primary"
+                      id="album-play-all-btn"
+                      onClick={onPlayAll}
+                      {...tooltipAttrs(t('albumDetail.playTooltip'))}
+                    >
                       <Play size={15} /> {t('common.play', 'Reproducir')}
                     </button>
                     {onShuffleAll && (
@@ -361,7 +367,12 @@ export default function AlbumHeader({
                   </div>
 
                   {showBioButton && (
-                    <button className="btn btn-surface" id="album-bio-btn" onClick={onBio}>
+                    <button
+                      className="btn btn-surface"
+                      id="album-bio-btn"
+                      onClick={onBio}
+                      {...tooltipAttrs(t('albumDetail.artistBioTooltip'))}
+                    >
                       <Highlighter size={16} /> {t('albumDetail.artistBio')}
                     </button>
                   )}
@@ -375,7 +386,12 @@ export default function AlbumHeader({
                       <span className="download-progress-pct">{downloadProgress}%</span>
                     </div>
                   ) : (
-                    <button className="btn btn-surface" id="album-download-btn" onClick={onDownload}>
+                    <button
+                      className="btn btn-surface"
+                      id="album-download-btn"
+                      onClick={onDownload}
+                      {...tooltipAttrs(t('albumDetail.downloadTooltip'))}
+                    >
                       <Download size={16} /> {t('albumDetail.download')}{totalSize > 0 ? ` · ${formatMb(totalSize)}` : ''}
                     </button>
                   )}