REFACTOR Landing.tsx improving readability and maintainability

[its-nott-me]

Refactor Landing page into modular sections and introduce global ThemeProvider (#37)

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Description

This PR addresses #37 by improving maintainability, readability, and state consistency in the Landing page and centralizing theme management.

What changed

• Split the Landing.tsx (~1.5k lines) into multiple focused section components

  • Each section is now ~100 lines and self-contained
  • Improves readability, reuse, and animation isolation

• Introduced ThemeProvider for global theme state

  • Eliminates duplicated useTheme state instances
  • Ensures consistent theme updates across routes and components

• Simplified Landing.tsx into a lightweight component

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Why this change

• Makes the Landing page easier to reason about, test, and extend
• Establishes a scalable pattern for future sections and pages
• Aligns theme handling with React best practices

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Technical notes

• No visual regressions intended
• No API or routing changes
• Theme state is now provided via context at the app level

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Checklist

• Verified theme toggling works across routes
• Confirmed Landing page renders correctly
• No breaking changes to existing routes or auth flow
• Code split follows consistent naming and structure

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[its-nott-me]

I've resolved the conflicts with base branch

[iTusharyadav]

@its-nott-me This PR has merge conflict with the latest main branch.
Please update your branch with the latest changes and resolve the conflicts.