Identify ores with the cursor: pinged veins, ores-only label, vein outline (t77)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/render/overlays.js

@@ -167,6 +167,22 @@ function drawPing() {
   }
   ctx.restore();
 }
+// Edges are built once when the cursor enters a different vein.
+function drawHoveredVein() {
+  if (SET.cursorLabel === 'off' || (!GAME.mouse.in && !GAME.usingPad)) return;
+  const vein = hoveredVein(Math.floor(GAME.aim.x), Math.floor(GAME.aim.y));
+  if (!vein) return;
+  const ctx = R.ctx, zp = R.zp;
+  ctx.save(); ctx.beginPath(); ctx.rect(0, 0, R.canvas.width, R.canvas.height); ctx.clip();
+  ctx.strokeStyle = 'rgba(235,245,255,0.85)'; ctx.lineWidth = 1;
+  ctx.beginPath();
+  for (const e of vein.edges) {
+    if (e[2] < R.vx0 || e[0] > R.vx0 + R.bw || e[3] < R.vy0 || e[1] > R.vy0 + R.bh) continue;
+    const a = worldToScreenPx(e[0], e[1]);
+    ctx.moveTo(a.x, a.y); ctx.lineTo(a.x + (e[2] - e[0]) * zp, a.y + (e[3] - e[1]) * zp);
+  }
+  ctx.stroke(); ctx.restore();
+}
 // While the ping recharges, a thin arc around the bot fills up (only with the drill in hand).
 function drawPingRecharge() {
   if (toolId() !== 'drill' || GAME.pingTick === undefined || tick < GAME.pingTick) return;