Camera portal timeouts from the web process, then a segfault in libgstpipewire.so at file offset 0x22813 in the pipewire-main-loop thread.

**Describe the bug**
AppImage 0.5.2 on Ubuntu 26.04 with GStreamer 1.28 and PipeWire 1.6.2, repeated Camera portal timeouts from the web process, then a segfault in libgstpipewire.so at file offset 0x22813 in the pipewire-main-loop thread.

**Steps to reproduce**
1. Open buzz
2. use as normal
3. background it
4. after a while it shows a blank screen in the window and becomes unresponsive

**Expected behavior**
To continue working as normal

**Version and platform**
Find your version at the bottom of the Settings sidebar. Write "unknown" if you can't determine it.
- Buzz version: v0.5.22
- OS: Ubuntu 26.04

**Logs / additional context**
The crash sequence (2026-09-02, the clearest example)

Sep 02 09:32:53.811504 Buzz_0.5.2_amd64.AppImage[323253]: buzz-desktop: WEBKIT_DMABUF_RENDERER_FORCE_SHM=1 — AppImage
Sep 02 09:32:54.226917 Buzz_0.5.2_amd64.AppImage[323253]: buzz-desktop: media proxy listening on 127.0.0.1:36323
Sep 02 09:32:56.153005 Buzz_0.5.2_amd64.AppImage[323338]: Unable to open pipewire remote. Error: Timeout was reached
Sep 02 09:32:56.163254 Buzz_0.5.2_amd64.AppImage[323338]: Unable to open pipewire remote. Error: Timeout was reached
Sep 02 09:32:56.558241 Buzz_0.5.2_amd64.AppImage[323338]: Unable to open pipewire remote. Error: Timeout was reached
... (17 more identical lines from pid 323338 between 09:32:56 and 09:33:12)
Sep 02 09:33:12.650979 Buzz_0.5.2_amd64.AppImage[323338]: Unable to open pipewire remote. Error: Timeout was reached
Sep 02 09:33:13.901887 kernel: pipewire-main-l[325368]: segfault at 18 ip 000073a790d64813 sp 000073a7b77fd2b0 error 4 in
libgstpipewire.so[22813,73a790d4a000+1e000] likely on CPU 11 (core 5, socket 0)

The other two occurrences, same fault at the same file offset

Sep 01 11:49:34.164040 kernel: pipewire-main-l[130906]: segfault at 18 ip 00007b538ff61813 sp 00007b53a9ffa2b0 error 4 in
libgstpipewire.so[22813,7b538ff47000+1e000] likely on CPU 5 (core 5, socket 0)
Sep 07 09:40:00.103441 kernel: pipewire-main-l[36717]: segfault at 18 ip 00007d8356c60813 sp 00007d834cdf72b0 error 4 in
libgstpipewire.so[22813,7d8356c46000+1e000] likely on CPU 11 (core 5, socket 0)
/var/log/apport.log: ERROR: apport (pid 36718) 2026-09-07 09:40:00,190: executable was modified after program start, ignoring