Theme system improvements

[7w1]

Description

Fixes #774
Adds pages for tweaks/themes browsing
Adds some simple catalog auto updating based on hashes
Adds the ability to load themes from uploaded .sable.css files in rooms

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).

Tests were AI generated

[github-actions]

Deploying with    Cloudflare Workers

Status	Preview URL	Commit	Alias	Updated (UTC)
✅ Deployment successful!	https://pr-1087-sable.raspy-dream-bb1d.workers.dev	f5bc759	pr-1087	Thu, 16 Jul 2026 17:13:58 GMT