docs: Add v1.0.0 beta testing information to README

Added comprehensive beta testing section including:
- Beta environment information (beta.morphic.sh)
- v1.0.0 branch explanation and merge conditions
- Branch selection guidance for users
- Feedback methods (GitHub Issues and in-app feedback button)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Merge pull request #707 from miurla/chore/changelog-beta7

Update changelog for v1.0.0 Beta.7

Release v1.0.0-beta.6

Release v0.4.6

Release v1.0.0-beta.5

- New Research Process UI with grouped sections
- Improved Thoughts display for better readability
- Enhanced TODO tracking with progress visualization

Merge pull request #679 from miurla/fix/message-actions-visibility

fix: avoid invisible action row in text parts

Merge pull request #655 from miurla/feature/animated-loading-logo

feat: add animated loading logo with eye movement

Merge pull request #624 from miurla/tailwind-v4-upgrade

feat: upgrade to Tailwind CSS v4.1.11 with CSS-based configuration

Merge pull request #589 from miurla/feat/dynamic-tools-support

feat: add support for AI SDK v5 dynamic tools

Merge pull request #561 from miurla/refactor/chat-messages-reasoning-…

…auto-collapse

refactor: improve reasoning auto-collapse logic in chat messages