feat: achievement timestamps, companion progress bars, max runestone indicator, and auto-prestige max-runes mode

apps/api/src/services/prestige.ts

@@ -189,6 +189,7 @@ const buildPostPrestigeState = (
 } => {
   const {
     autoPrestigeEnabled,
+    autoPrestigeMaxRunestonesOnly,
     count:              currentPrestigeCount,
     purchasedUpgradeIds,
     runestones:         currentRunestones,
@@ -215,6 +216,9 @@ const buildPostPrestigeState = (
     ...autoPrestigeEnabled === undefined
       ? {}
       : { autoPrestigeEnabled },
+    ...autoPrestigeMaxRunestonesOnly === undefined
+      ? {}
+      : { autoPrestigeMaxRunestonesOnly },
   };
 
   const freshState = initialGameState(currentState.player, characterName);

apps/api/test/services/prestige.spec.ts

@@ -255,6 +255,20 @@ describe("buildPostPrestigeState", () => {
     expect(prestigeData.autoPrestigeEnabled).toBeUndefined();
   });
 
+  it("preserves autoPrestigeMaxRunestonesOnly when set", () => {
+    const state = makeMinimalState({
+      prestige: { autoPrestigeMaxRunestonesOnly: true, count: 0, productionMultiplier: 1, purchasedUpgradeIds: [], runestones: 0 },
+    });
+    const { prestigeData } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeData.autoPrestigeMaxRunestonesOnly).toBe(true);
+  });
+
+  it("omits autoPrestigeMaxRunestonesOnly when not set", () => {
+    const state = makeMinimalState();
+    const { prestigeData } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeData.autoPrestigeMaxRunestonesOnly).toBeUndefined();
+  });
+
   it("preserves apotheosis data across prestige", () => {
     const apotheosis = { count: 2 };
     const state = makeMinimalState({ apotheosis });