feat(queue): add Now-Playing Info tab with artist bio, song credits and Bandsintown tour dates (#244)

* feat(queue): add Now-Playing Info tab with artist bio, song credits and Bandsintown tour dates

A third tab in the right-side queue panel surfaces context for the
currently playing track:

- Artist card: image + biography from Subsonic getArtistInfo (Last.fm
  "Read more on Last.fm" anchor stripped), with read-more toggle that
  only appears when the bio actually overflows the 4-line clamp.
- Song info: contributor credits from OpenSubsonic contributors[]
  rendered stacked (name prominent, role muted). Section is hidden
  entirely on servers without contributor support, and rows that just
  re-state the main artist under role "artist" are filtered out.
- On tour: optional Bandsintown integration (opt-in, off by default).
  HTTP fetch + JSON parsing happen entirely on the Rust side; the
  frontend wrapper deduplicates concurrent calls and caches results in
  RAM for the session. Limited to 5 events with a "Show N more" toggle.
  When the toggle is off, the section becomes an in-place opt-in card
  with a privacy info-tooltip explaining what data is sent — same
  tooltip is also exposed on the matching toggle in Settings.

Caching: artist info and song detail are memoised by stable IDs across
component remounts, so jumping between tracks of the same album/artist
does not refire the network calls.

Implementation notes:
- Bandsintown app_id "js_app_id" — arbitrary strings (e.g. "psysonic")
  now return HTTP 403 from rest.bandsintown.com; js_app_id is the ID
  Bandsintown's own embeddable widget uses and is broadly accepted.
- Tour items use negative left/right margins so the date badge stays
  visually aligned with the section title while the hover background
  extends slightly past the section edges.
- New i18n namespace nowPlayingInfo across all 8 locales (en, de, fr,
  nl, zh, nb, ru, es) including pluralised "Show N more" forms.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(now-playing-info): switch nested flex-columns to block layout to stop content-dependent drift

Repeated reports of the Tour and Song-info sections rendering at
inconsistent x-positions (sometimes left of the section title,
sometimes centred, sometimes correctly aligned) — varying by artist,
sidebar width, and even whether "Show more" was clicked.

Root cause: nested flex-direction: column containers
(.np-info → .np-info-section → .np-info-tour / .np-info-credits) where
the cross-axis (horizontal) sizing on WebKitGTK occasionally inherits
the intrinsic min-content of the longest child. With one
"Naherholungsgebiet/Freizeitgelände Lago Alfredo"-style venue name
that overflows the sidebar, the parent ul gets pushed past 100% width
and the entire layout drifts. min-width: 0 on every level didn't help
because cross-axis stretch in flex-column ignores it for content-driven
overflow.

Fix: collapse all the section/list containers to display: block. Block
layout is content-agnostic — children always render at 100% parent
width, left-aligned, deterministically. Spacing between siblings now
uses the lobotomy selector (`> * + * { margin-top }`).

Only the tour item itself stays flex (badge ↔ meta horizontal layout),
and that one still has overflow: hidden + flex: 1 1 0 + min-width: 0
on the meta column to truncate venue/place text with ellipsis.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Psychotoxical <dev@psysonic.app>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/pages/Settings.tsx

@@ -1817,6 +1817,34 @@ export default function Settings() {
                   <span className="toggle-track" />
                 </label>
               </div>
+              <div className="settings-section-divider" />
+              <div className="settings-toggle-row">
+                <div>
+                  <div style={{ fontWeight: 500, display: 'flex', alignItems: 'center', gap: 6 }}>
+                    <span>{t('settings.enableBandsintown')}</span>
+                    <span
+                      style={{
+                        display: 'inline-flex',
+                        alignItems: 'center',
+                        color: 'var(--text-muted)',
+                        cursor: 'help',
+                      }}
+                      data-tooltip={t('nowPlayingInfo.enableBandsintownPrivacy')}
+                      data-tooltip-pos="bottom"
+                      data-tooltip-wrap="true"
+                      aria-label={t('nowPlayingInfo.enableBandsintownPrivacy')}
+                      tabIndex={0}
+                    >
+                      <Info size={13} />
+                    </span>
+                  </div>
+                  <div style={{ fontSize: 12, color: 'var(--text-muted)' }}>{t('settings.enableBandsintownDesc')}</div>
+                </div>
+                <label className="toggle-switch" aria-label={t('settings.enableBandsintown')}>
+                  <input type="checkbox" checked={auth.enableBandsintown} onChange={e => auth.setEnableBandsintown(e.target.checked)} />
+                  <span className="toggle-track" />
+                </label>
+              </div>
             </div>
           </section>