Generate a single MapInfo list; move SPECIAL_TEAM_MAPS and en.json map names into info.json (#4231)

**Add approved & assigned issue number here:**

N/A — maintainer follow-up to #4227.

## Description:

Follow-up to #4227, finishing the "info.json is the single source of
truth" refactor.

**Maps.gen.ts now generates one `MapInfo` interface and a `maps` list**
instead of parallel lookup records. `mapCategories`,
`mapTranslationKeys`, and `multiplayerFrequency` are gone — consumers
read the list directly (`map.categories`, `map.translationKey`,
`map.multiplayerFrequency`). MapPicker got simpler in the process: it
renders from `MapInfo` objects, so the reverse
`Object.entries(GameMapType)` lookup to recover the enum key is gone.
The featured-rank sort moved out of the Go codegen into the picker,
where the presentation concern belongs.

**`SPECIAL_TEAM_MAPS` moves into info.json** as an optional
`special_team_count` field (set on the same 17 maps with the same
values). MapPlaylist derives its map from the generated list;
`SPECIAL_TEAM_FORCE_CHANCE` and the frequency multiplier behavior are
unchanged.

**The en.json `map` section is now generated.** A new optional
`display_name` field in info.json (defaulting to `name`) is written to
`resources/lang/en.json` by the generator, preserving the section's
non-map UI keys (`map`, `featured`, `all`, `favorites`, `random`). The 8
maps whose English display name intentionally differs from the frozen
enum value (e.g. `MENA`, `Milky Way`, `Europe (Classic)`, `Baikal (Nuke
Wars)`) declare it via `display_name`, so no display text changes. The
section is emitted alphabetically; since #4232 already sorted en.json
and every value matches, regeneration is byte-identical and this PR has
no en.json diff. Other languages remain Crowdin-managed.

The generator also now validates `translation_key` is exactly
`map.<folder>` and `special_team_count >= 2`. MapConsistency tests
compare info.json directly against the generated list and the en.json
section, and fail with a "run `npm run gen-maps`" message on drift. No
behavior changes: enum values, playlist frequencies, special-team
counts, featured order, and display names are all byte-identical.

## Please complete the following:

- [x] I have added screenshots for all UI updates (no UI changes —
internal refactor, rendering output identical)
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory

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

evanpelle

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: evanpelle

map-generator/README.md

@@ -49,7 +49,8 @@ Alternatively, `npm run gen-maps` (from the root directory) runs the generator f
 - `../resources/maps/<map_name>/map4x.bin` - 1/4 scale (half dimensions) binary map data used for mini-maps.
 - `../resources/maps/<map_name>/map16x.bin` - 1/16 scale (quarter dimensions) binary map data used for mini-maps.
 - `../resources/maps/<map_name>/thumbnail.webp` - WebP image thumbnail of the map.
-- `../src/core/game/Maps.gen.ts` - Generated TypeScript (`GameMapType`, `mapCategories`, `mapTranslationKeys`, `multiplayerFrequency`) built from every map's info.json. Regenerated on every run, even with `--maps`.
+- `../src/core/game/Maps.gen.ts` - Generated TypeScript (the `GameMapType` enum and the `maps` list of `MapInfo` objects) built from every map's info.json. Regenerated on every run, even with `--maps`.
+- `../resources/lang/en.json` - The `map` section is rewritten with each map's display name. Regenerated on every run, even with `--maps`.
 
 ## Command Line Flags
 
@@ -121,14 +122,18 @@ Example:
 
 `name` is the map's canonical name — the `GameMapType` enum value. It must never change once the map ships (it is part of the wire format and stored in game records).
 
-`translation_key` is the key of the map's display name in `../resources/lang/en.json` (`map.<map_name>`).
+`display_name` (optional) is the English display name written to the `map` section of `../resources/lang/en.json`. It defaults to `name` — set it only when the display name should differ from the canonical name (e.g. `MENA`, `Europe (Classic)`).
+
+`translation_key` is the key of the map's display name in `../resources/lang/en.json`. It must be `map.<map_name>`.
 
 `categories` groups the map in the map picker. Each entry must be one of: `featured`, `world`, `europe`, `asia`, `north_america`, `africa`, `south_america`, `oceania`, `antarctica`, `cosmic`, `tournament`, `other`. Maps that straddle regions (e.g. Black Sea, Bering Strait) can list more than one. Add `featured` to show the map in the featured section of the map picker.
 
 `multiplayer_frequency` is how many times the map appears in the public multiplayer playlist. Use 0 (or omit) to keep the map out of the regular rotation.
 
 `featured_rank` (optional, featured maps only) is the map's position in the featured grid (1 = first). Featured maps without a rank sort after ranked ones, alphabetically.
 
+`special_team_count` (optional) is the map's preferred team count in team / special games — see `SPECIAL_TEAM_MAPS` in `../src/server/MapPlaylist.ts`. Omit it for no preference.
+
 `flag` is the code for a country
 
 - The full list of supported codes can be seen in `../src/client/data/countries.json` - all ISO_3166 codes are supported, with several additions.
@@ -148,12 +153,14 @@ The country will need to be added to `../src/client/data/countries.json`
 
 ## To Enable In-Game
 
-`GameMapType`, `mapCategories`, `mapTranslationKeys`, and
-`multiplayerFrequency` are generated from the info.json files into
-`../src/core/game/Maps.gen.ts` when the map-generator runs — do not edit that
-file by hand. The only step outside info.json is:
+Everything is generated from the info.json files when the map-generator runs —
+there are no manual steps:
 
-- Add the map's display name to the `map` translation object in `../resources/lang/en.json` (using your `translation_key`)
+- The `GameMapType` enum and the `maps` list (one `MapInfo` per map) are
+  written to `../src/core/game/Maps.gen.ts`. Do not edit that file by hand.
+- The `map` section of `../resources/lang/en.json` is rewritten with each
+  map's `display_name` (or `name`). Translations to other languages are
+  managed via Crowdin.
 
 ## Notes
 

map-generator/assets/maps/aegean/info.json

@@ -4,6 +4,7 @@
   "translation_key": "map.aegean",
   "categories": ["europe"],
   "multiplayer_frequency": 6,
+  "special_team_count": 2,
   "nations": [
     {
       "coordinates": [786, 1860],

map-generator/assets/maps/archipelagosea/info.json

@@ -1,6 +1,7 @@
 {
   "id": "ArchipelagoSea",
   "name": "ArchipelagoSea",
+  "display_name": "Archipelago Sea",
   "translation_key": "map.archipelagosea",
   "categories": ["europe"],
   "multiplayer_frequency": 3,

map-generator/assets/maps/baikal/info.json

@@ -4,6 +4,7 @@
   "translation_key": "map.baikal",
   "categories": ["asia"],
   "multiplayer_frequency": 5,
+  "special_team_count": 2,
   "nations": [
     {
       "coordinates": [695, 665],

map-generator/assets/maps/baikalnukewars/info.json

@@ -1,6 +1,7 @@
 {
   "id": "BaikalNukeWars",
   "name": "Baikal Nuke Wars",
+  "display_name": "Baikal (Nuke Wars)",
   "translation_key": "map.baikalnukewars",
   "categories": ["other"],
   "multiplayer_frequency": 0,

map-generator/assets/maps/beringsea/info.json

@@ -4,6 +4,7 @@
   "translation_key": "map.beringsea",
   "categories": ["asia", "north_america"],
   "multiplayer_frequency": 5,
+  "special_team_count": 2,
   "nations": [
     {
       "coordinates": [1043, 121],

map-generator/assets/maps/beringstrait/info.json

@@ -4,6 +4,7 @@
   "translation_key": "map.beringstrait",
   "categories": ["asia", "north_america"],
   "multiplayer_frequency": 2,
+  "special_team_count": 2,
   "nations": [
     {
       "coordinates": [1297, 287],

map-generator/assets/maps/bosphorusstraits/info.json

@@ -4,6 +4,7 @@
   "translation_key": "map.bosphorusstraits",
   "categories": ["europe", "asia"],
   "multiplayer_frequency": 3,
+  "special_team_count": 2,
   "nations": [
     {
       "coordinates": [564, 245],

map-generator/assets/maps/britanniaclassic/info.json

@@ -1,6 +1,7 @@
 {
   "id": "BritanniaClassic",
   "name": "Britannia Classic",
+  "display_name": "Britannia (Classic)",
   "translation_key": "map.britanniaclassic",
   "categories": ["europe"],
   "multiplayer_frequency": 0,

map-generator/assets/maps/choppingblock/info.json

@@ -4,6 +4,7 @@
   "translation_key": "map.choppingblock",
   "categories": ["other"],
   "multiplayer_frequency": 5,
+  "special_team_count": 4,
   "nations": [
     {
       "coordinates": [230, 230],