Adds Antarctica map

[RickD004]

Description:

Re-adds and reworks the previously April Fools "Reglaciated Antarctica" as a new map, this time with proper elevation data: Map of Antarctica centered in the South Pole.

The "appeal" of this a map is that it has no green terrain. (As such it has a really low rotation number (of 1). )

This also completes the Continental map category (antarctica was the only continent out of the traditional 7 missing).

antarctica.mp4

The base map image is a composite of 2 relief maps from 2 different sources, both properly credited

Please complete the following:

• I have added screenshots for all UI updates
• I process any text displayed to the user through translateText() and I've added it to the en.json file
• I have added relevant tests to the test directory
• I confirm I have thoroughly tested these changes and take full responsibility for any bugs introduced

Please put your Discord username so you can be contacted if a bug or regression is found:

tri.star1011

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Walkthrough

Adds Antarctica as a new game map: assets and manifest, map-generator registration, English label, game enum/category update, playlist weight, and new credit entries for Polar Geospatial Center and USGS dataset.

Changes

Cohort / File(s)	Summary
Core Game Type src/core/game/Game.ts	Added Antarctica to GameMapType and included it in the continental category.
Map generation registry & assets map-generator/main.go, map-generator/assets/maps/antarctica/info.json	Registered antarctica in the map registry and added info.json with 10 nation entries (coordinates, names, flags).
Map resources / manifest resources/maps/antarctica/manifest.json	New manifest name: "antarctica" with base/variant dimensions, land-tile counts, and 10 nation definitions.
Localization & playlist resources/lang/en.json, src/server/MapPlaylist.ts	Added map.antarctica translation entry and set playlist frequency weight Antarctica: 2.
Credits / Attribution CREDITS.md	Inserted “### Antarctica Map” credit block with Polar Geospatial Center (DOI/Dataverse/version), PGC Terms of Use link, USGS dataset attribution, and public-domain reference lines.

Sequence Diagram(s)

sequenceDiagram
  participant Dev as Developer/CI
  participant Gen as MapGenerator
  participant Assets as AssetsStore
  participant Server as GameServer
  participant Client as GameClient

  Dev->>Gen: build/generate including `antarctica`
  Gen->>Assets: read `assets/maps/antarctica/info.json`
  Gen->>Assets: read `resources/maps/antarctica/manifest.json`
  Gen-->>Server: publish generated map assets/manifest
  Server->>Server: register GameMapType.Antarctica
  Server->>Server: include Antarctica in playlist (weight 2)
  Client->>Server: request map list
  Server-->>Client: return map list including Antarctica

Loading

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

❄️ A white new map is added to play,
Flags on ice where penguins stray,
Manifests, credits, and names in line,
Antarctica joins the map design. 🧊

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a new Antarctica map to the system.
Description check	✅ Passed	The description is well-related to the changeset, explaining the purpose, features, and background of the Antarctica map addition.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@CREDITS.md`:
- Line 72: Replace the agency name text in CREDITS.md where it currently reads
"U.S Geological Survey" (the line containing the link
https://earthexplorer.usgs.gov/metadata/4980/GT30ANTARCPS/) with the correctly
punctuated "U.S. Geological Survey" to ensure consistent naming across the
credits; update only the visible text portion before or inside the markdown link
so the URL remains unchanged.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2e0d64cb-77c1-4a09-8262-44bc73aae597

📥 Commits

Reviewing files that changed from the base of the PR and between b88c3a3 and 582b4ee.

⛔ Files ignored due to path filters (4)

• map-generator/assets/maps/antarctica/image.png is excluded by !**/*.png
• resources/maps/antarctica/map.bin is excluded by !**/*.bin
• resources/maps/antarctica/map16x.bin is excluded by !**/*.bin
• resources/maps/antarctica/map4x.bin is excluded by !**/*.bin

📒 Files selected for processing (8)

• CREDITS.md
• map-generator/assets/maps/antarctica/info.json
• map-generator/main.go
• resources/lang/en.json
• resources/maps/antarctica/manifest.json
• resources/maps/antarctica/thumbnail.webp
• src/core/game/Game.ts
• src/server/MapPlaylist.ts