fix: useEffect dependency and cleanup list keys

[Anirudh-020505]

Description

This PR improves React performance and rendering stability by fixing a missing useEffect dependency array and standardizing the use of unique IDs as keys when rendering lists.

What’s Changed

src/pages/Templates.jsx

• Added an empty dependency array ([]) to useEffect to ensure the document title is set only once on component mount, preventing unnecessary re-renders.
• Updated map functions to use unique IDs (t.id, c.id) as key values instead of array indices.

src/components/EditorHeader/Modal/New.jsx

• Updated template list rendering to use temp.id as the key.

src/components/EditorCanvas/Canvas.jsx

• Updated relationship list rendering to use e.id as the key.

Why This Matters

• Prevents redundant re-renders caused by missing dependency arrays.
• Improves React reconciliation by using stable, unique keys.
• Aligns the codebase with React best practices for maintainability and performance.

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