Theme flashes from light to dark on page navigation

[Rakesh-116]

Description:
When navigating between pages with dark theme enabled, the page briefly displays in light theme before switching to dark theme. This creates a jarring white flash that negatively impacts user experience.

Steps to Reproduce:

1. Go to https://notesbuddy.in/
2. Switch to dark theme using the theme toggle
3. Navigate to any other page (e.g., click on Notes, Pricing, or any link)
4. Observe that the page initially renders in light theme
5. After a brief moment, the theme switches to dark

Expected Behavior:
The dark theme should be applied immediately without any visible flash. The page should render in dark theme from the start if that's the saved preference.

Actual Behavior:
Every page navigation shows a brief flash of light theme before the dark theme is applied, creating a distracting white flash effect.