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.

nix/psysonic.nix

@@ -35,9 +35,9 @@
   gst_all_1,
   src,
   upstreamMeta,
-  # When true (default), wrapProgram sets GDK_BACKEND=x11 for WebKit stability on many setups.
-  # When false, GDK follows the session (e.g. native Wayland) — often better HiDPI sizing.
-  forceGdkX11 ? true,
+  # When true, wrapProgram sets GDK_BACKEND=x11 (legacy conservative stack).
+  # When false (default), only lib paths — GDK follows session; binary applies webkit2gtk-nvidia-quirk only.
+  forceGdkX11 ? false,
 }:
 
 let
@@ -163,10 +163,7 @@ stdenv.mkDerivation (finalAttrs: {
   postFixup =
     let
       gdkX11Wrap = lib.optionalString forceGdkX11 ''
-        --set GDK_BACKEND x11 \
-      '';
-      allowNativeGdkWrap = lib.optionalString (!forceGdkX11) ''
-        --set PSYSONIC_ALLOW_NATIVE_GDK 1 \
+        --set GDK_BACKEND x11
       '';
     in
     ''
@@ -174,8 +171,7 @@ stdenv.mkDerivation (finalAttrs: {
         --prefix LD_LIBRARY_PATH : "${lib.makeLibraryPath [ libayatana-appindicator ]}" \
         --prefix GST_PLUGIN_PATH : "${gstPluginPath}" \
         --prefix GIO_EXTRA_MODULES : "${glib-networking}/lib/gio/modules" \
-        ${gdkX11Wrap}${allowNativeGdkWrap}--set WEBKIT_DISABLE_COMPOSITING_MODE 1 \
-        --set WEBKIT_DISABLE_DMABUF_RENDERER 1
+        ${gdkX11Wrap}
     '';
 
   meta = {