feat: add JSON workspace import capability

[Babin123456]

Related Issue

Closes #23

Summary

This PR implements workspace import capability from JSON files, enabling seamless restoration of exported flowchart diagrams.

Changes Made

• Added handleImportWorkspace function to App.tsx.
• Exposed onImportWorkspace prop in CenterCanvasProps.
• Created a hidden file input element in the canvas toolbar.
• Added an "Import" button to trigger the input file selector.
• Implemented file reading and structure checking to parse and validate files.

Testing

• Tested locally by exporting a flowchart blueprint to a text file.
• Cleared the canvas, clicked "Import", uploaded the file, and verified the flowchart was correctly restored.

Screenshots

N/A

Impact

Improves workspace mobility and data portability.

Checklist

• Code follows project standards
• Tested locally
• No unrelated changes included
• Responsive design verified
• Accessibility considered

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Summary by cubic

Add JSON workspace import to restore flowcharts from exported files. Adds an Import button in the canvas toolbar and loads validated blocks into the canvas with feedback.

• New Features
  • Import from .json or .txt via toolbar button (hidden file input).
  • Parses JSON array or { blueprint: Block[] }; shows error toast on invalid format.
  • On success: loads blocks, selects the first block, clears active parent, and shows a success toast.
  • Adds onImportWorkspace prop to CenterCanvas and handleImportWorkspace in App.

^{Written for commit 8d55c18. Summary will update on new commits.}

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[github-actions]

✅ Thanks! This PR is linked to #23 and will close it automatically when merged.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 49b4a45b-6c35-4810-bc51-049ac89a62b8

📥 Commits

Reviewing files that changed from the base of the PR and between 22009dd and 8d55c18.

📒 Files selected for processing (2)

• src/App.tsx
• src/components/CenterCanvas.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}