com.spotify.Client crashes immediately (SIGSEGV) on Bazzite 42 Kinoite KDE Wayland + NVIDIA (Freedesktop 25.08)

### Problem
Spotify Flatpak fails to start on my system.

Running:

flatpak run com.spotify.Client

exits immediately with no output and no window.

---

### System
- OS: Bazzite 42.20251019.0 (Kinoite)
- /etc/os-release shows:
- VERSION_ID=42
- OSTREE_VERSION=42.20251019.0
- VARIANT=Kinoite
- VARIANT_ID=bazzite-asus-nvidia-open
- Desktop: KDE Plasma (Wayland)
- Session:
- XDG_SESSION_TYPE=wayland
- WAYLAND_DISPLAY=wayland-0
- Flatpak installation: system
- Hardware: ASUS ROG laptop (hybrid Intel iGPU + NVIDIA dGPU)

---

### Spotify Flatpak version
Output of `flatpak info com.spotify.Client`:

- Version: 1.2.74.477.g3be53afe
- Branch: stable
- Runtime: org.freedesktop.Platform/x86_64/25.08
- Commit: 5eacaceb7e6b19bdf0502d907741e26ccd1789976d3d64f51ec9726de7af83e6
- Date: 2026-01-26

---

### NVIDIA driver / GPU
`nvidia-smi`:

- NVIDIA-SMI / Driver Version: 580.95.05
- GPU: NVIDIA GeForce RTX 2060 (6GB)
- CUDA Version: 13.0

---

### Graphics info
`glxinfo -B` (in the current session):

OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) UHD Graphics (CML GT2)
Mesa version: 25.2.4

(The session appears to use the Intel iGPU by default; system is hybrid iGPU+dGPU.)

---

### Crash evidence (SIGSEGV)
`coredumpctl list | grep -i spotify` shows a Spotify crash:

Wed 2026-01-14 19:58:19 +08 PID 29769 SIGSEGV /app/extra/share/spotify/spotify

`coredumpctl info 29769`:

- Signal: 11 (SEGV)
- Executable: /app/extra/share/spotify/spotify
- Stack trace:
#0 0x000055db09313f14 n/a (/app/extra/share/spotify/spotify + 0x2a8ef14)

Note: the corresponding core file is now missing, so I cannot provide a gdb backtrace from that crash.

---

### Portal backend
On KDE, I ensured the Plasma portal backend is running:

systemctl --user start plasma-xdg-desktop-portal-kde.service
systemctl --user restart xdg-desktop-portal

Spotify still exits immediately.

---

### What I tried (no success)
- `flatpak repair` (runtime repair / reinstall runtimes)
- Restarted xdg-desktop-portal and Plasma portal backend
- `flatpak run com.spotify.Client --disable-gpu`
- Clearing config/cache under `~/.var/app/com.spotify.Client`
- Reinstalling Spotify Flatpak

Still exits immediately; appears to be crashing (SIGSEGV).

---

### Notes
This looks like a compatibility issue involving:
- com.spotify.Client (Electron/CEF)
- Freedesktop runtime 25.08
- KDE Plasma Wayland
- Hybrid GPU laptop environment (Intel iGPU + NVIDIA dGPU, driver 580.95.05)

Please let me know what additional debug information would be most useful to collect next time (e.g. enabling coredumps, running under gdb/strace, etc.).