release(v2.6.1): Dart 3, Offline Mode, and more...

[johannesvedder]

Changes in this release:

Core, App

• Dart 3
• Analytics

App

• Dart 3 migration
• Analytics
• Offline mode
• New result chart library
• Improved questionaire slider

Designer

• feat: Designer Dashboard Improvements #457

Other

• Advanced Docker deployment

TODO

• Analytics is currently breaking. We need a migration script for this, and make it fully optional in the code.
• Should we remove legacy packages from the main branch (designer, etc.)?
• Finish minimal result charts (see StudyU V1 paper as a reference)
• Properly disable or repair linear regression
• Test offline mode
• Migrate Supabase to local deployment

[github-actions]

Visit the preview URL for this PR (updated for commit 3bb5bd1):

• https://studyu-dev-app-2--pr433-dev-y3ut8lpf.web.app
• https://studyu-dev-designer-2--pr433-dev-x1mhtpyz.web.app

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