chore(release): Add changelog for 22.0.0-rc.1

[nickvergessen]

22.0.0-rc.1 – 2025-09-04

Added

• feat(hosted-hpb): Support setting the TURN and STUN server if included #15700
• feat(assistant): Use new assistant theming #15773

Changed

• Update dependencies
• Update translations

Fixed

• fix(threads): Allow renaming a thread #15779
• fix(threads): Hide ignored threads from "Followed threads" list #15781
• fix(threads): Don't create threads without a title #15790
• fix(threads): Show temporary message as a thread already #15800
• fix(calls): Scroll chat to bottom when joining a call #15774

[nickvergessen]

/backport! to stable32

[danxuliu]

Missing:
#15486
#15801

[nickvergessen]

Missing:
#15486
#15801

While yes, no one can see the difference so far 🙈 So it felt not relevant for the changelog