Add peekaboo DPM stat to Tankopedia firepower

Adds a **Peekaboo DPM** entry nested under DPM for single-shot guns, estimating damage per minute when only firing after resetting camouflage (or waiting out the reload, whichever is slower), assuming at least 10 seconds between shots.

- Shots per minute are capped at `60/10` for reloads faster than 10s, and fall back to `60/reload` otherwise
- The result is multiplied by the currently selected shell's damage and rounded
- An (i) icon next to the label opens a popover explaining the calculation
- The row is hidden for auto-loader/auto-reloader guns
- No percentile ranking bar is shown, since no dataset exists yet for this new stat

packages/website/src/core/blitzkit/tankCharacteristics.ts

@@ -418,6 +418,10 @@ export function tankCharacteristics(
       : (gun.gun_type!.$case === "regular"
           ? gun.gun_type!.value.reload
           : gun.gun_type!.value.clip_reload) * reloadCoefficient;
+  const peekabooDpm =
+    gun.gun_type!.$case === "regular"
+      ? Math.round(damage * (60 / Math.max(shellReload!, 10)))
+      : undefined;
   const caliber = shell.caliber;
   const penetration = shell.penetration!.near * penetrationCoefficient;
   const clipDamage =
@@ -545,6 +549,7 @@ export function tankCharacteristics(
     shellRicochet,
     dpm,
     dpmEffective,
+    peekabooDpm,
     shells,
     mostOptimalShellIndex,
     shellReloads,