fix: normalize line endings via .gitattributes

[ApexYash11]

Closes #67

What & why

There was no .gitattributes and prettier.config.js doesn't override endOfLine. On Windows with the common core.autocrlf=true checkout, every file is checked out with \r\n line endings, so:

• npm run lint (prettier --check .) flags all 26 files as having style issues (Prettier defaults to endOfLine: 'lf').
• npm run format would rewrite the whole tree, creating huge diffs and blocking Windows contributors.

Change

Add a .gitattributes that normalizes text files to LF:

* text=auto eol=lf
*.bat text eol=crlf   # Windows batch scripts need CRLF

This makes npm run lint / npm run format behave identically on Windows and Linux/CI. It is a zero-runtime-risk change.

Verification

• Reproduced locally: before the fix, prettier --check . reported issues in 26/26 files (all CRLF).
• After the fix, a fresh clone + checkout produces LF line endings and prettier --check src reports All matched files use Prettier code style!.
• npm run typecheck and npm test are unaffected (no runtime code changed).

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