feat: add landscape orientation option

[thejoeyluu]

resolves pr #75 by leaving test files untouched.
updated views.py and latex_utils.py
Added orientation to the model and serializer so the layout choice successfully saves to db
Addressed Copilot's feedback by adding 'orientation' to REACT save payloads so setting persists when reloading a sheet

[Copilot]

Pull request overview

Adds support for a portrait/landscape layout option so a cheat sheet’s chosen orientation is preserved and applied during LaTeX normalization/compilation.

Changes:

• Frontend: include orientation in save/autosave payload so it persists across reloads.
• Backend: ensure compile_latex includes orientation in layout normalization and normalize_only responses.
• LaTeX generation: update header/layout comment generation to apply landscape via document class + geometry options.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
frontend/src/components/CreateCheatSheet.jsx	Persists orientation in the save/autosave payload and minor formatting cleanup.
backend/api/views.py	Loads and returns orientation in compile/normalize responses and passes it into layout normalization.
backend/api/latex_utils.py	Applies orientation in dynamic header generation and tweaks layout comment block formatting/comments.

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