fix: add .gitattributes so Windows checkouts do not corrupt binary maps

[eastwoodgrant]

Resolves #4601

Problem

The repo had no .gitattributes, so on a default Windows clone (core.autocrlf=true, the Git for Windows installer default) checkout applied LF→CRLF conversion to binary map .bin data: every 0x0A byte gained a 0x0D prefix, the file no longer matched width*height, and the game crashed on map load.

Fix

Add a .gitattributes marking binary asset types (map data, images, audio, fonts) as binary (a macro for -text -diff), so Git checks them out verbatim on every platform. Deliberately scoped to binaries only — no * text=auto, to avoid renormalizing existing text files.

Verification

• git check-attr -a on a .bin reports binary: set, text: unset (verbatim); .svg/.ts remain unaffected.
• Adding the file produces no renormalization of existing tracked files.
• Note: the corruption is Windows-specific (autocrlf=true), so it was verified via git check-attr rather than a Windows checkout.

Discord: granster9

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a2a9ce79-ba2d-4097-a52b-4d9773106b81

📥 Commits

Reviewing files that changed from the base of the PR and between 845d6b1 and 490b27b.

📒 Files selected for processing (1)

• .gitattributes

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Walkthrough

Added a root .gitattributes file that marks map data, images, audio, and font formats as binary, disabling Git text and EOL handling for these assets.

Changes

Binary asset handling

Layer / File(s)	Summary
Binary asset attributes .gitattributes	Marks .bin, image, audio, and font file extensions as binary so Git treats them as binary assets.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: celant, developingtom, evanpelle

Poem

Binaries stand, bytes in flight,
Git keeps each asset right.
Maps and images, sound and font,
Cross-platform checkouts do what they ought.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the main change: adding .gitattributes to protect Windows checkouts from binary map corruption.
Description check	✅ Passed	The description matches the patch and explains the problem, fix, and verification steps.
Linked Issues check	✅ Passed	The change adds a root .gitattributes for binary assets, matching issue #4601's goal to stop checkout-time corruption.
Out of Scope Changes check	✅ Passed	The PR is limited to the .gitattributes file and does not introduce unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

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[Celant]

Could we remove this comment? That history is tracked in the issue and PR, I don't think we need it as a permanent comment too