Use one instance count for all beta games

src/lib/beta-draft.ts

@@ -6,7 +6,7 @@ export interface BetaDraft {
     picks: Array<{ scriptId: number | null; versionId: number | null }>;
     servers: string[]; testPlan: BetaPlan;
     selectionMode: 'automatic' | 'manual';
-    instancesPerGame: Record<string, number | null>;
+    instanceCount: number | null;
     label?: string;
 }
 /** Validate draft structure, preserving incomplete numeric fields for correction. */
@@ -23,9 +23,17 @@ export function readBetaDraft(raw: string | null): BetaDraft | null {
         if (d.instancesPerGame !== undefined && (!d.instancesPerGame || typeof d.instancesPerGame !== 'object'
             || Array.isArray(d.instancesPerGame) || !Object.entries(d.instancesPerGame).every(([game, count]) =>
                 ['t5', 't6'].includes(game) && (count === null || typeof count === 'number' && Number.isFinite(count))))) return null;
+        if (d.instanceCount !== undefined && d.instanceCount !== null
+            && (typeof d.instanceCount !== 'number' || !Number.isFinite(d.instanceCount))) return null;
+        const previousCounts = Object.values(d.instancesPerGame ?? {}) as Array<number | null>;
+        const instanceCount = d.instanceCount !== undefined ? d.instanceCount
+            : previousCounts.includes(null) ? null : previousCounts.length ? Math.max(...previousCounts as number[]) : 1;
         // Existing drafts represent explicit selections and must not silently switch modes.
-        return { ...d, selectionMode: d.selectionMode ?? (d.servers.length ? 'manual' : 'automatic'),
-            instancesPerGame: d.instancesPerGame ?? {}, step: Math.max(0, Math.min(3, Number(d.step) || 0)) };
+        const selectionMode = d.selectionMode ?? (d.servers.length ? 'manual' : 'automatic');
+        // Revisit server setup when old per-game counts cannot be retained as one value.
+        const changedCounts = selectionMode === 'automatic' && d.instanceCount === undefined && new Set(previousCounts).size > 1;
+        return { ...d, selectionMode,
+            instanceCount, step: Math.max(0, Math.min(changedCounts ? 1 : 3, Number(d.step) || 0)) };
     } catch { return null; }
 }
 
@@ -48,9 +56,10 @@ export function betaApplicableGames(files: readonly BetaFileScope[], servers: re
     ].filter((game): game is string => game === 't5' || game === 't6'))].sort();
 }
 
-/** Keep incomplete counts recoverable and default newly applicable games to one. */
-export function betaInstanceCounts(games: readonly string[], saved: Record<string, number | null>): Record<string, number | null> {
-    return Object.fromEntries(games.map(game => [game, saved[game] === undefined ? 1 : saved[game]]));
+/** Expand the shared count only to games represented by the selected files. */
+export function betaInstanceCounts(games: readonly string[], count: number | null): Record<string, number> {
+    if (count === null || !Number.isSafeInteger(count) || count < 1 || count > 1000) return {};
+    return Object.fromEntries(games.map(game => [game, count]));
 }
 
 export function compatibleBetaServers(selected: Iterable<string>, candidates: readonly string[]): { kept: Set<string>; removed: string[] } {