fix: allow window dragging

[laylatichy]

What changed

Added the missing core:window:allow-start-dragging permission to the main Tauri capability.

This allows the existing custom title-bar drag regions to invoke Tauri's window-drag command instead of failing with an ACL error.

Related issue

N/A

How was this tested

• cargo check
• Built and launched the arm64 macOS .app
• Confirmed the custom title bar can drag the window without an ACL error
• Tested on macOS Apple Silicon

Checklist

• npx tsc --noEmit passes
• cargo check passes (if backend changed)
• I've tested this on my OS — noted which: macOS Apple Silicon
• Docs updated if user-facing behaviour changed — N/A, bug fix only
• No secrets, tokens, or personal paths in the diff

[vercel]

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[gsvprharsha]

Allows window dragging in MacOS.