feat: Replace unzip with @zip.js/zip.js for Windows compatibility

[ClayWarren]

feat: Replace unzip with @zip.js/zip.js for Windows compatibility

 **Problem:**
 Users on Windows encountered an "Executable not found in $PATH: 'unzip'" error when running `opencode.exe`, as the
  application relied on the `unzip` command for extracting `fzf.exe` and `rg.exe`. This external dependency caused issues on systems where `unzip` was not pre-installed or configured in the PATH.
 
 **Solution:**
 This PR replaces the usage of the external `unzip` command with the `@zip.js/zip.js` library for handling `.zip` file
  extraction on Windows. This change affects the download and extraction logic for `fzf.exe` in `src/file/fzf.ts` and
  `rg.exe` in `src/file/ripgrep.ts`.
 
**Benefits:**
- Improves Windows compatibility and robustness by removing the dependency on an external `unzip` executable.
- Ensures a more consistent and reliable installation experience for Windows users.
- The solution is implemented using a cross-platform JavaScript library, integrating seamlessly with the existing Bun
  runtime.

Resolves Issue #608

[maharshi365]

@ClayWarren i tested this and it works, but there are merge conflicts. if you get a chance to update so that it can be merge would be great!