Rearrange homepage game boxes & tune special modifier probabilities 🎲 (#3420)

## Description:

**Homepage layout:** Reorder the game mode cards so FFA is the left
(large) box, Teams is the upper-right box, and Special Games is the
lower-right box. Mobile order updated to match (FFA → Teams → Special).

**Special game modifiers:**
- Adjusted modifier count roll to 40%/40%/15%/5% for 1/2/3/4 modifiers
(was 30%/40%/20%/10%) because having so many special games with 3/4
modifiers while we only have 8 modifiers in the pool is a bit dumb (from
the 8 modifiers two are mutually exclusive and 4 should be quite rare).
- Changed ticket counts in `SPECIAL_MODIFIER_POOL` so
isAlliancesDisabled and isHardNations are more rare.

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [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
- [X] 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:

FloPinguin

src/server/MapPlaylist.ts

@@ -109,14 +109,14 @@ type ModifierKey =
 
 // Each entry represents one "ticket" in the pool. More tickets = higher chance of selection.
 const SPECIAL_MODIFIER_POOL: ModifierKey[] = [
-  ...Array<ModifierKey>(4).fill("isRandomSpawn"),
-  ...Array<ModifierKey>(8).fill("isCompact"),
-  ...Array<ModifierKey>(1).fill("isCrowded"),
-  ...Array<ModifierKey>(1).fill("isHardNations"),
-  ...Array<ModifierKey>(8).fill("startingGold"),
-  ...Array<ModifierKey>(1).fill("startingGoldHigh"),
-  ...Array<ModifierKey>(1).fill("goldMultiplier"),
-  ...Array<ModifierKey>(1).fill("isAlliancesDisabled"),
+  ...Array<ModifierKey>(8).fill("isRandomSpawn"),
+  ...Array<ModifierKey>(16).fill("isCompact"),
+  ...Array<ModifierKey>(3).fill("isCrowded"), // should be quite rare as it causes max-size lobbies
+  ...Array<ModifierKey>(1).fill("isHardNations"), // should be quite rare because it's just for the PvPvE enjoyers
+  ...Array<ModifierKey>(16).fill("startingGold"),
+  ...Array<ModifierKey>(4).fill("startingGoldHigh"), // should be quite rare because it's very crazy
+  ...Array<ModifierKey>(6).fill("goldMultiplier"),
+  ...Array<ModifierKey>(1).fill("isAlliancesDisabled"), // should be quite rare because it removes a key element of OpenFront
 ];
 
 // Modifiers that cannot be active at the same time.
@@ -515,16 +515,16 @@ export class MapPlaylist {
     count?: number,
     countReduction: number = 0,
   ): PublicGameModifiers {
-    // Roll how many modifiers to pick: 30% → 1, 40% → 2, 20% → 3, 10% → 4
-    const modifierCountRoll = Math.floor(Math.random() * 10) + 1;
+    // Roll how many modifiers to pick: 40% → 1, 40% → 2, 15% → 3, 5% → 4
+    const modifierCountRoll = Math.floor(Math.random() * 100) + 1;
     const k = Math.max(
       0,
       (count ??
-        (modifierCountRoll <= 3
+        (modifierCountRoll <= 40
           ? 1
-          : modifierCountRoll <= 7
+          : modifierCountRoll <= 80
             ? 2
-            : modifierCountRoll <= 9
+            : modifierCountRoll <= 95
               ? 3
               : 4)) - countReduction,
     );