Linux: session-native GDK/WebKit mitigations and in-page browse scroll (#731)

* feat(linux): session GDK defaults, nvidia-quirk, optional x11-legacy wrap

Ship PSYSONIC_ALLOW_NATIVE_GDK from Nix/AUR instead of pinning WEBKIT_DISABLE_*
and GDK x11. Add flake psysonic-x11-legacy for the old wrap; alias gdk-session
to psysonic. Startup uses webkit2gtk-nvidia-quirk and Wayland-aware compositing;
refresh Help (a45) and nixos-install docs.

* fix(linux): session GDK and nvidia-quirk only; drop wrapper env heuristics

Remove PSYSONIC_ALLOW_NATIVE_GDK and devShell GDK/WEBKIT exports; stop
synthesizing GDK/WebKit vars in main.rs. Update Nix/AUR wrappers, install
docs, CHANGELOG, and help FAQ with practical user-facing workarounds.

* fix(linux): X11-pinned GDK uses DMABUF quirk path, not Wayland explicit-sync

When GDK_BACKEND is forced to x11 on a wayland user session, webkit2gtk-nvidia-quirk
would still apply __NV_DISABLE_EXPLICIT_SYNC and gray out the webview. Map that case
to WEBKIT_DISABLE_DMABUF_RENDERER like native X11.

* fix(ui): stabilize WebKitGTK/Wayland hover paint for nav and media cards

Sidebar nav links avoid transition:all and promote icons with translateZ(0).
Artist rows and album/artist/song cards use compositing hints; card shadows
and borders no longer interpolate so cover zoom can stay smooth without jitter.

* fix(ui): isolate artist/album card text and cover paint on WebKitGTK

Promote cover blocks with contain/paint and text stacks with translateZ(0);
use artist-card-info on the artists grid for the same layout as other cards.

* feat(artists): in-page overlay scroll and locked main viewport

Move list/grid into an inner OverlayScrollArea, stop sticky toolbar from
owning the route scroll, align the rail with the main panel edge, and skip
the main-route overlay thumb when the viewport cannot scroll vertically.

* feat(browse): extend in-page overlay scroll to more library routes

Reuse the locked main viewport pattern from Artists for Albums, Composers,
Lossless albums, and New releases; wire VirtualCardGrid and scroll chrome
to the matching in-page viewport ids.

* fix(linux): improve Wayland GPU compositing text clarity in WebKitGTK

Use on-demand hardware acceleration on main and mini webviews when the
session is Wayland and compositing stays on; gate subpixel body AA on the
same conditions via new Tauri probes. Document PSYSONIC_SKIP_WAYLAND_FONT_TUNING
for opt-out and changelog.

* fix(rust): satisfy clippy needless_return in Linux webkit helpers

* fix(linux): tune Wayland text rendering with HW policy env and CSS

Allow PSYSONIC_WEBKIT_WAYLAND_HW_POLICY to select WebKit hardware
acceleration policy (never/always vs default on-demand). Extend Wayland
font CSS to #root with geometricPrecision and text-size-adjust on html.

* feat(linux): Wayland text presets in settings, safe WebKit apply, CPU default

Persist profile to app config; apply WebKit policy at startup/mini only to
avoid WebKitGTK hangs on live toggles. UI + CSS preview stays live; default
preset is sharp (CPU-friendly).

* fix(linux): map Wayland sharp preset to OnDemand WebKit policy

HardwareAccelerationPolicy::Never at startup broke main-viewport wheel
scrolling on WebKitGTK+Wayland; sharp vs balanced remains a CSS AA path.
Use PSYSONIC_WEBKIT_WAYLAND_HW_POLICY for a true Never policy.

* fix(rust): gate Linux-only Wayland WebKit helpers for Windows builds

Re-export startup helpers only under cfg(linux) and drop non-Linux stubs so
Windows compiles without unused-import and dead-code warnings.

* chore(release): CHANGELOG + credits for Linux session/WebKit work (PR #731)

Consolidate scattered incremental changelog notes into two [1.47.0]
entries with PR link; remove duplicate Linux blocks from [1.46.0] Fixed.
Append settings credit line for cucadmuh.

src/hooks/useMainScrollingIndicator.ts

@@ -1,17 +1,20 @@
 import { useEffect, useState } from 'react';
-import { APP_MAIN_SCROLL_VIEWPORT_ID } from '../constants/appScroll';
+import {
+  APP_MAIN_SCROLL_VIEWPORT_ID,
+  MAIN_ROUTE_INPAGE_SCROLL_VIEWPORT_ID_BY_PATH,
+} from '../constants/appScroll';
 
 const SCROLL_IDLE_MS = 180;
 
 /**
- * `true` while the main route viewport or the Now Playing viewport is
- * actively scrolling, falling back to `false` after `SCROLL_IDLE_MS` of
- * silence. Used to fade out the queue handle (and similar floating
- * controls) while the user is scrolling, so they don't sit on top of the
- * overlay scrollbar thumb.
+ * `true` while a tracked viewport is actively scrolling, then `false` after
+ * `SCROLL_IDLE_MS` of silence. Used to fade out the queue handle (and similar
+ * floating controls) while the user is scrolling, so they don't sit on top of
+ * the overlay scrollbar thumb.
  *
- * Re-binds on `pathname` change because Now Playing's viewport mounts
- * lazily and isn't in the DOM on every route.
+ * Tracks `#app-main-scroll-viewport`, and on browse routes with a locked main
+ * scroll also the matching in-page overlay viewport. Re-binds on `pathname`
+ * because Now Playing's viewport mounts lazily.
  */
 export function useMainScrollingIndicator(pathname: string): boolean {
   const [isMainScrolling, setIsMainScrolling] = useState(false);
@@ -22,6 +25,11 @@ export function useMainScrollingIndicator(pathname: string): boolean {
     if (appViewport) viewports.add(appViewport);
     const nowPlayingViewport = document.querySelector<HTMLElement>('.np-main__viewport');
     if (nowPlayingViewport) viewports.add(nowPlayingViewport);
+    const inpageId = MAIN_ROUTE_INPAGE_SCROLL_VIEWPORT_ID_BY_PATH[pathname];
+    if (inpageId) {
+      const inpageVp = document.getElementById(inpageId);
+      if (inpageVp) viewports.add(inpageVp);
+    }
     if (viewports.size === 0) return;
 
     let scrollHideTimer: number | null = null;