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/SongRow.tsx

@@ -10,6 +10,7 @@ import { enqueueAndPlay } from '../utils/playback/playSong';
 import { useDragDrop } from '../contexts/DragDropContext';
 import { useOrbitSongRowBehavior } from '../hooks/useOrbitSongRowBehavior';
 import { formatTrackTime } from '../utils/format/formatDuration';
+import { tooltipAttrs } from './tooltipAttrs';
 
 interface Props {
   song: SubsonicSong;
@@ -79,14 +80,14 @@ function SongRow({ song, showBpm }: Props) {
         <button
           className="song-list-row-btn song-list-row-btn--play"
           onClick={(e) => { e.stopPropagation(); handlePlay(); }}
-          aria-label="Play"
+          {...tooltipAttrs(t('common.play'))}
         >
           <Play size={14} fill="currentColor" />
         </button>
         <button
           className="song-list-row-btn"
           onClick={(e) => { e.stopPropagation(); handleEnqueue(); }}
-          aria-label="Enqueue"
+          {...tooltipAttrs(t('common.addToQueue'))}
         >
           <ListPlus size={14} />
         </button>