Refactor: Reimplement sync layer with Codesandboxes

[saddlepaddle]

• plan
• WIP - trying to get the file system stuff working as intended
• WIP
• WIP
• WIP
• WIP
• feat: hide nextjs portal (feat: hide nextjs portal #2891)
• feat: add context window display (feat: add context window display #2885)
• feat: add subscription management to settings panel (feat: add subscription management to settings panel #2868)
• chore: Unify linting strategy + enforce linting across repo (chore: Unify linting strategy + enforce linting across repo #2839)
• feat: add project cloning functionality (feat: add project cloning functionality #2870)
• WIP
• WIP

Description

Related Issues

Type of Change

• Bug fix
• New feature
• Documentation update
• Release
• Refactor
• Other (please describe):

Testing

Screenshots (if applicable)

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