Save "last mileage reward" field

Not entirely clear what it does but it prevents a music unlock
notification notification from popping at the start of every credit
whether or not the underlying music unlock flag is already set.

src/idz/decoder/saveProfile.ts

@@ -61,6 +61,7 @@ export function saveProfile(buf: Buffer): SaveProfileRequest {
       cup: buf.readUInt8(0x0110),
       gauges: buf.readUInt16LE(0x0114),
       music: buf.readUInt16LE(0x0140),
+      lastMileageReward: buf.readUInt32LE(0x013c),
     },
     settings: {
       music: buf.readUInt16LE(0x045a),

src/idz/encoder/loadProfile2.ts

@@ -57,6 +57,7 @@ export function loadProfile2(res: LoadProfileResponse2) {
   buf.writeUInt16LE(0x0065, 0x0000);
   buf.writeUInt8(res.unlocks.cup, 0x00b4);
   buf.writeUInt16LE(res.unlocks.gauges, 0x00b8);
+  buf.writeUInt32LE(res.unlocks.lastMileageReward, 0x01e8);
   buf.writeUInt16LE(res.unlocks.music, 0x01ec);
   mission(res.missions.team).copy(buf, 0x038a);
   buf.writeUInt16LE(0xffff, 0x0388); // [1]

src/idz/handler/createProfile.ts

@@ -30,7 +30,12 @@ export async function createProfile(
   const missions: MissionState = { team: [], solo: [] };
   const settings: Settings = { music: 0, pack: 13640, paperCup: 0, gauges: 5 };
   const story: Story = { x: 0, y: 0, rows: [] };
-  const unlocks: Unlocks = { cup: 0, gauges: 0, music: 0 };
+  const unlocks: Unlocks = {
+    cup: 0,
+    gauges: 1 << 5,
+    music: 0,
+    lastMileageReward: 0,
+  };
 
   await Promise.all([
     w.profile().save(profile.id, profile),

src/idz/model/unlocks.ts

@@ -2,4 +2,12 @@ export interface Unlocks {
   cup: number;
   gauges: number;
   music: number;
+
+  // Doesn't really fit anywhere but let's put it here for now. This field is
+  // an odd one, still not entirely sure what its purpose and semantics are,
+  // but if we don't save it then the unlock notification for the music track
+  // THE TOP (unlocked at 300km mileage) pops up at the start of every credit
+  // even if its music unlock bit is set and round-tripped.
+
+  lastMileageReward: number;
 }