feat: remove file type restrictions and fix unsupported file download

[lefarcen]

Summary

Remove file type restrictions for workflow variables and fix file download issues.

File Type Restrictions Removed:

• Removed resource type selector from ResourceTypeForm, defaulting to all types
• Allow any file type upload without extension restrictions
• File-to-variable conversion now accepts all file types with default resourceTypes: ['document', 'image', 'audio', 'video']

Download Fix:

• Fixed empty file download in unsupported file preview by using useDownloadFile hook
• Added loading state for download button

Import Modal:

• Disabled import button while files are uploading

Impact Areas

• Free-form Canvas Interface
• Workflow Variables
• Resource Library

Checklist

• I understand that this PR may be closed in case there was no previous discussion or issues.
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/mashu/remove-file-type

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