[FEATURE] Remove Unnecessary @ffmpeg/* Dependencies from package.json

[jiangzhuo]

Platform

Windows 11

Browser

Chrome 137

Current Behavior

The project currently lists the following dependencies in package.json:
https://github.com/OpenCut-app/OpenCut/blob/main/apps/web/package.json#L17-L19

These appear to be unnecessary for the current codebase and introduce extra bundle size, install time, and (potentially) licensing / security surface. We already have (or can adopt) a better alternative that does not require shipping the full WebAssembly-based FFmpeg packages.

Why This Is a Bug

• Adds large transitive downloads (WASM binaries) that are never invoked in the code paths I inspected.
• Increases cold start / build time.
• Potentially bloats client bundle (if any part is bundled) or node_modules size.
• Creates confusion for contributors who may assume FFmpeg-based media processing is required.

Expected Behavior

The project should not include heavyweight media-processing dependencies if they are not required. Media functionality (if any) should rely on the chosen alternative approach.

Recurrence Probability

Always

Steps To Reproduce

• Clone the repo and install dependencies (pnpm install / npm install / yarn install).
• Observe that @ffmpeg/core, @ffmpeg/ffmpeg, and @ffmpeg/util are installed.
• Search the codebase for imports:
• grep -R "@ffmpeg/ffmpeg" src/ (or equivalent) returns no meaningful usage (only maybe leftover comments or none at all).
• Run the application / build; functionality works without actually invoking these packages.

Anything else?

@mazeincoding should be able to provide a better alternative.

[mazeincoding]

this was just for the mvp but someone is already working on this! the preview will be refactored to use an entirely different approach than the current. i'd avoid working on this for now! (to do wasted work)