feat: Add animated intro splash screen and fix theme hydration mismatch

[Abhishek2005-ard]

Description

This PR introduces a new animated splash screen that appears on initial application load, creating a smoother and more polished user experience before the main dashboard is revealed. Additionally, it resolves a Next.js hydration mismatch warning related to the theme toggle component.

Changes Made

Added SplashScreen Component: Created a full-screen, theme-aware splash overlay (src/components/SplashScreen.tsx) that features a pulsing Reframe brand logo and text.
Root Layout Integration: Injected the splash screen into src/app/layout.tsx so it mounts immediately on initial page load.
Smooth Transitions: Implemented timeout logic so the splash screen displays for 1.8 seconds before triggering a smooth 500ms fade-out and unmounting entirely.
Fixed Hydration Mismatch**: Updated src/components/ThemeToggle.tsx to wait for client hydration before rendering the light/dark mode icon. This resolves the Invalid HTML tag nesting / typeof window !== 'undefined' error caused by the server and client rendering different SVG icons on the initial load.

Visual Changes

Users will now see a brief, animated "Reframe" logo overlay when they first visit the app, which gracefully fades out into the video editor dashboard.

Type of Change

New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)

ScreenShort:-

close #1017

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[github-actions]

✅ PR Format Check Passed — @Abhishek2005-ard

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[github-actions]

👋 Thanks for your PR, @Abhishek2005-ard!

Welcome to Reframe — a browser-based video editor built for everyone 🎬

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Quick checklist

• PR title follows Conventional Commits (e.g. feat: add dark mode)
• Linked the issue this PR closes (e.g. Closes #123)
• Tested the changes locally (bun run dev)
• Build passes (bun run build)

Useful links

• 📖 CONTRIBUTING.md
• 🐛 Open Issues
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Happy coding! 🎉

[Abhishek2005-ard]

Hi maintainers, could you please approve the workflows/checks for this PR? The build appears to be waiting for approval. Thank you!

[magic-peach]

@Abhishek2005-ard Thanks for the splash screen contribution! However, this PR is a duplicate of #1030 which implements the same feature with better quality (localStorage first-visit check, prefers-reduced-motion support, aria-hidden accessibility).

Closing this in favor of #1030. You're welcome to contribute other features!