feat(master-vega): add ship assets, jungle world, and species selection flow

- Add human ship spritesheet (ships.png) and increase frame size to 192x192
- Add jungle world background texture (world-jungle-01.png)
- Add human ship animation videos (scout, frigate, destroyer, cruiser,
  battleship, transport, colony)
- Enable species card selection with required choice before starting game
- Disable "Begin" button until a species is selected
- Add title logo breathing animation and light sweep effect on landing screen
- Reposition title and start button on landing layout

data/mastervega-artwork.json

@@ -34,7 +34,7 @@
   "worldBackgrounds": {
     "terran":    { "key": "vega-world-terran",    "path": "assets/images/vega/world-terran-01.png" },
     "ocean":     { "key": "vega-world-ocean",     "path": "assets/images/vega/world-ocean-01.png" },
-    "jungle":    { "key": "vega-world-jungle",    "path": null },
+    "jungle":    { "key": "vega-world-jungle",    "path": "assets/images/vega/world-jungle-01.png" },
     "steppe":    { "key": "vega-world-steppe",    "path": "assets/images/vega/world-steppe-01.png" },
     "arid":      { "key": "vega-world-arid",      "path": "assets/images/vega/world-arid-01.png" },
     "desert":    { "key": "vega-world-desert",    "path": "assets/images/vega/world-desert-01.png" },
@@ -52,10 +52,10 @@
   "sheets": {
     "ships": {
       "key": "vega-ships",
-      "path": null,
+      "path": "assets/images/vega/ships.png",
       "kind": "ship",
-      "frameWidth": 96,
-      "frameHeight": 96,
+      "frameWidth": 192,
+      "frameHeight": 192,
       "cols": 8,
       "rows": 10,
       "_layout": "One row per species (species.shipFrame), one column per hull (hull.frame). Frame = shipFrame * 8 + hull.frame. Ships face UP at frame rest."

src/games/mastervega/MasterOfVegaGame.js

@@ -115,6 +115,55 @@ export default class MasterOfVegaGame extends Phaser.Scene {
     return t;
   }
 
+  // A periodic light sweep over the title logo. A soft white band is masked to
+  // the title's own alpha (so it only lights the lettering, never the backdrop)
+  // and travels left → right on a loop. Returns the shine object so the caller
+  // can stop it if the landing layer is torn down.
+  paintTitleShine(layer, title) {
+    if (!this.textures.exists('vega-menu-title')) return null;
+    const w = title.displayWidth;
+    const h = title.displayHeight;
+    if (!w || !h) return null;
+
+    const bandW = Math.max(140, Math.round(w * 0.3));
+    const bandH = Math.ceil(h);
+
+    // A horizontal gradient: transparent → bright white → transparent.
+    if (!this.textures.exists('vega-title-shine')) {
+      const g = this.make.graphics({ add: false });
+      const steps = 48;
+      for (let i = 0; i < steps; i += 1) {
+        const t = i / (steps - 1);
+        const a = Math.sin(t * Math.PI);
+        g.fillStyle(0xffffff, a * 0.5);
+        g.fillRect(i * (bandW / steps), 0, Math.ceil(bandW / steps) + 1, bandH);
+      }
+      g.generateTexture('vega-title-shine', bandW, bandH);
+      g.destroy();
+    }
+
+    const shine = this.add.image(title.x, title.y, 'vega-title-shine')
+      .setBlendMode(Phaser.BlendModes.ADD);
+    shine.setMask(title.createBitmapMask());
+    layer.add(shine);
+
+    // Start fully off the left edge, sweep across, then loop after a pause.
+    const travel = w + bandW * 2;
+    const startX = title.x - travel / 2;
+    const endX = title.x + travel / 2;
+    shine.x = startX;
+
+    this.tweens.add({
+      targets: shine,
+      x: endX,
+      duration: 1500,
+      ease: 'Sine.easeInOut',
+      delay: 2200,
+      repeat: -1,
+    });
+    return shine;
+  }
+
   // --------------------------------------------------------------- landing
 
   showLanding() {
@@ -123,8 +172,20 @@ export default class MasterOfVegaGame extends Phaser.Scene {
 
     this.paintBackdrop(layer, 0.34);
 
-    // Logo large on the left.
-    this.paintTitle(layer, 580, 430, 900, 560, 76);
+    // Logo large on the left, breathing gently.
+    const title = this.paintTitle(layer, 1400, 300, 900, 560, 76);
+
+    this.tweens.add({
+      targets: title,
+      scale: title.scaleX * 1.04,
+      duration: 2800,
+      ease: 'Sine.easeInOut',
+      yoyo: true,
+      repeat: -1,
+    });
+
+    // A light sweep over the logo, masked to the lettering, on a loop.
+    this.paintTitleShine(layer, title);
 
     // Buttons well below it, over on the right.
     const bx = 1420;
@@ -327,7 +388,7 @@ export default class MasterOfVegaGame extends Phaser.Scene {
     enqueueSpeech(UI_SPEECH.chooseSpecies, null, { force: true });
 
     const choice = {
-      speciesId: 'human',
+      speciesId: null,
       sizeId: 'medium',
       shapeId: 'spiral',
       difficultyId: 'normal',
@@ -372,13 +433,13 @@ export default class MasterOfVegaGame extends Phaser.Scene {
           choice.speciesId = spec.id;
           for (const c of cards) c.bg.setStrokeStyle(1.5, 0x24405f, 1);
           bg.setStrokeStyle(2.5, 0x6fc4ff, 1);
+          start.setEnabled(true);
         });
       }));
       card.add(zone);
       layer.add(card);
       cards.push({ bg, spec });
     });
-    cards[0].bg.setStrokeStyle(2.5, 0x6fc4ff, 1);
 
     // --- option rows
     const optY = 600;
@@ -418,10 +479,11 @@ export default class MasterOfVegaGame extends Phaser.Scene {
       layer.add(b);
     });
 
-    const start = new Button(this, GAME_WIDTH / 2 + 430, optY + 124, 'Begin', this.uiClick(() => {
+    const start = new Button(this, GAME_WIDTH / 2, GAME_HEIGHT - 90, 'Begin', this.uiClick(() => {
       layer.destroy();
       this.beginGame(choice);
     }), { width: 260, height: 64, fontSize: 30 });
+    start.setEnabled(false);
     layer.add(start);
 
     // Resuming lives on the landing screen now, so this only steps back to it.