Merge origin/master into the programme guide branch

Adopts the compact icon-only timeline toolbar (#1557): the Guide button is
now an icon-only `epg-timeline__iconbtn` with its label in the tooltip and
aria-label, so the unused EPG.TIMELINE.GUIDE key is dropped from all locales.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.changes/epg-timeline-compact-controls.md

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+---
+type: feature
+area: epg
+---
+
+The EPG timeline toolbar is more compact: "Now" is an icon button, and the zoom slider is replaced by a single button that cycles day overview → by hour → detailed. Ctrl/⌘ + scroll (or a trackpad pinch) over the timeline zooms smoothly around the cursor. The channel and programme title now use all the space the controls free up.

.changes/live-tv-hidden-channel-list.md

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+---
+type: fix
+area: live-tv
+issues: [1458]
+---
+
+A hidden channel list no longer looks like a playlist that lost its channels: the player now says the list is hidden and offers a "Show channels list" button, a toggle in the workspace header stays in place in both states, and hiding the list in one place (M3U player, portal Live TV, favorites/recent) no longer hides it everywhere else.

.changes/portals-live-channel-return.md

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+---
+type: fix
+area: portals
+issues: [1520]
+---
+
+Xtream and Stalker keep remote channel order while you browse other categories or search. Use Show playing channel to return to the current channel without restarting playback. Stalker radio supports the same behavior.

.changes/xtream-auto-live-ts-fallback.md

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+---
+type: fix
+area: xtream
+issues: [1513]
+---
+
+Xtream Live TV in Auto can try advertised TS once when HLS initially fails with an HTTP error in a web player. The selected player and stream headers are kept. Settings explain the manual TS workaround for external players, Embedded MPV, and HLS retries that never report a terminal failure.