Merge branch 'master' into perf/j3-epg-ribbon-window

.changes/dashboard-hero-light-legibility.md

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+---
+type: fix
+area: dashboard
+---
+
+The dashboard hero stays readable in the light theme: titles without artwork
+get a light tinted backdrop instead of a dark slab, text keeps a solid backing
+over busy artwork (also in narrow windows), and the star rating is darker.
+Screen readers now find one stable "Dashboard" page heading and hear slide
+changes they make.

.changes/playback-embedded-mpv-slow-shell-selection.md

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+---
+type: fix
+area: playback
+---
+
+On Linux, the app no longer switches a saved Embedded MPV player back to the
+default player when your login shell is slow to start. It now keeps your
+choice until it knows for certain whether mpv is installed.

.changes/workspace-header-back-everywhere.md

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+---
+type: feature
+area: workspace
+---
+
+Back is now always in the same place: Settings, search, Discover and actor pages use the Back button at the start of the top bar instead of their own. Any page you reached from another one also shows it, and it takes you to the previous page.

.changes/workspace-rail-traffic-light-gap.md

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+---
+type: fix
+area: workspace
+---
+
+On macOS the side rail now starts level with the page content and the dashboard banner, so its first button no longer crowds the window's close, minimize and zoom buttons.