Flatpak RC4 doesn't launching

I installed flatpak package from discord and it doesn't launching.
Arch Linux, Niri, Wayland
CPU: AMD Ryzen 9 7940HS (16) @ 5.26 GHz
GPU 1: NVIDIA GeForce RTX 4060 Max-Q / Mobile [Discrete]
GPU 2: AMD Radeon 780M Graphics [Integrated]
```
$ env RUST_BACKTRACE=full flatpak run art.graphite.Graphite

Available WGPU adapters:
[0] Vulkan IntegratedGpu (Name: AMD Radeon 780M Graphics (RADV PHOENIX), Driver: radv, Device: 5567)
[1] Vulkan DiscreteGpu (Name: NVIDIA GeForce RTX 4060 Laptop GPU, Driver: NVIDIA, Device: 10400)
[2] Vulkan Cpu (Name: llvmpipe (LLVM 21.1.8, 256 bits), Driver: llvmpipe, Device: 0)
[3] Gl Other (Name: AMD Radeon 780M Graphics (radeonsi, phoenix, LLVM 21.1.8, DRM 3.64, 6.19.6-arch1-1), Driver: , Device: 0)

Using WGPU adapter: AdapterInfo { name: "NVIDIA GeForce RTX 4060 Laptop GPU", vendor: 4318, device: 10400, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "590.48.01", backend: Vulkan }

thread 'main' (2) panicked at desktop/src/render/state.rs:36:119:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
0: 0x557f128349cc -
1: 0x557f10ee8ebf -
2: 0x557f1282301f -
3: 0x557f1282d793 -
4: 0x557f1283ba87 -
5: 0x557f1283b967 -
6: 0x557f1283bc41 -
7: 0x557f1282da5a -
8: 0x557f1282d8a9 -
9: 0x557f128372ed -
10: 0x557f10bdaaf0 -
11: 0x557f10bda892 -
12: 0x557f111c2d9f -
13: 0x557f111b7cf0 -
14: 0x557f1125e9b8 -
15: 0x557f11260d35 -
16: 0x557f111a738d -
17: 0x557f1122017d -
18: 0x557f111641d3 -
19: 0x557f111641c9 -
20: 0x557f128393fb -
21: 0x557f1116422c -
22: 0x7f72a682c975 -
23: 0x7f72a682ca28 - __libc_start_main
24: 0x557f10de19f5 -
25: 0x0 -
```

Start with desktop/src/render/state.rs at line 36 and reproduce the failure using `env RUST_BACKTRACE=full flatpak run art.graphite.Graphite`. Trace why the selected NVIDIA Vulkan adapter leaves the indexed collection empty, then verify that the Flatpak application launches without the panic on the reported Arch Linux, Wayland, and GPU setup.

索引モデルが issue の本文から書いたものです。