feat(drawer): improve dark mode toggle UI and placement

[NitinSohal]

Fixes #

Describe the changes you have made in this PR -

This PR improves the dark mode toggle by turning it into a more intuitive switch and placing it at the top of the drawer. The new placement enhances visibility and access, leading to a better overall user experience. The change ensures theme switching feels natural and easily reachable.

• Made the Dark Mode button into a toggle switch for easier use.
• Improved visibility and interaction, making it more user-friendly.
• I moved it to the top of the drawer so users could find it quickly.
• Placement is now cleaner and more intuitive — no longer awkwardly hidden.
• Overall, it enhances the user experience and makes switching themes smoother.

Screenshots of the changes (If any) -

Older Light Mode

Newer Light Mode

Older Dark Mode

Newer Dark Mode

Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.

Summary by CodeRabbit

• New Features
  • Introduced an enhanced theme toggle that allows users to seamlessly switch between light and dark modes with smooth, animated transitions.
  • Expanded localization support by adding new language entries for "Light Mode" and "Dark Mode" across supported languages, ensuring a consistent experience throughout the app.

[coderabbitai[bot]]

Walkthrough

This update adds new string entries for theme modes in two localization files by introducing "light_mode" and "dark_mode" keys. In addition, a minor formatting adjustment is made in one of the localization files. The user interface component is also modified: a new ListTile with an animated icon and switch is introduced in the drawer to handle theme toggling, replacing the previous IconButton implementation.

Changes

Files	Change Summary
lib/l10n/app_en.arb lib/l10n/app_hi.arb	Added new entries "light_mode" and "dark_mode" for localization. In app_hi.arb, a minor formatting adjustment is made to the "contact_us_text" entry.
lib/ui/.../cv_drawer.dart	Introduced a new ListTile with an AnimatedSwitcher and a Switch for theme toggling, replacing the previous IconButton implementation.

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