refactor(reactflow,svelteflow): use context to persist dragged node type

[bcakmakoglu]

🚀 What's changed?

• Use React/Svelte context to persist the dragged node type
• Use context value on drop of node
• Replace dataTransfer usages

🌻 Resolves

• 465

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Name	Status	Preview	Comments	Updated (UTC)
reactflow-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 14, 2024 10:46am
svelteflow-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 14, 2024 10:46am
xyflow-svelte-examples	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 14, 2024 10:46am
xyflow-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 14, 2024 10:46am

[moklick]

Awesome :) Thanks @bcakmakoglu!