fix(ui+game): responsive profile bar, auto-wave toggle, and stats on early exit

Profile bar on phones:
- With the new Statistik/Admin chips the bar overflowed the viewport on
  small screens. It now wraps (flex-wrap + max-width) and compacts its
  paddings, fonts and chip sizes below 560px

Auto-wave (🔁 button in the HUD controls):
- New persistent toggle (localStorage) that starts the next wave on its
  own ~0.4s after intermission begins, collecting the full early-call
  bonus without pressing the wave button every round
- Toggling it on during an active intermission starts the wave
  immediately; works in solo and multiplayer (uses the same action path
  as the manual button); active state shows green

Stats are now saved when leaving via the menu:
- Previously only victory/defeat recorded a result — exiting a running
  game via "🚪 Zurück zum Hauptmenü" or the pause menu discarded the
  whole run, which is why endless-mode progress beyond wave 20 never
  showed up in the stats
- engine.abandon() records best score, stats and crystals (counted as a
  defeat) whenever a solo game is left mid-run; no-ops when no game is
  running or the result was already reported, so no double counting

Verified in the browser (390x844, admin account): profile bar wraps
compactly; 🔁 auto-started wave 1 during intermission without manual
click; exiting mid-wave recorded the run (💎 2, 1 Runde, beste Welle 1).
Build clean, 54/54 tests green.

src/components/Hud.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, ref } from 'vue'
+import { computed, onBeforeUnmount, ref, watch } from 'vue'
 import { store } from '@/game/store'
 import { engine } from '@/game/engine'
 import { mpgame, uiSetSpeed, uiStartWaveEarly, uiTogglePause } from '@/game/mpgame'
@@ -18,11 +18,44 @@ function previewTooltip(kind: string): string {
   return ENEMIES[kind as keyof typeof ENEMIES].name
 }
 
+// ---------------------------------------------------------------- auto wave
+// When enabled, the next wave starts on its own the moment intermission
+// begins (collecting the full early-call bonus) – no button pressing.
+let autoTimer: ReturnType<typeof setTimeout> | null = null
+
+function scheduleAutoWave(): void {
+  if (autoTimer) clearTimeout(autoTimer)
+  autoTimer = setTimeout(() => {
+    autoTimer = null
+    if (store.autoWave && store.phase === 'intermission') uiStartWaveEarly()
+  }, 400)
+}
+
+function toggleAutoWave(): void {
+  store.autoWave = !store.autoWave
+  if (typeof localStorage !== 'undefined') {
+    localStorage.setItem('trxtd-autowave', store.autoWave ? '1' : '0')
+  }
+  if (store.autoWave && store.phase === 'intermission') scheduleAutoWave()
+}
+
+watch(
+  () => store.phase,
+  (p) => {
+    if (p === 'intermission' && store.autoWave) scheduleAutoWave()
+  },
+)
+
+onBeforeUnmount(() => {
+  if (autoTimer) clearTimeout(autoTimer)
+})
+
 function exitToMenu(): void {
   confirmExit.value = false
   if (store.mp.active) {
     mpgame.leave()
   } else {
+    engine.abandon() // record stats/crystals so the running round is not lost
     store.screen = 'menu'
     store.result = null
     engine.setPaused(false)
@@ -72,6 +105,14 @@ function exitToMenu(): void {
     </div>
 
     <div class="hud-controls">
+      <button
+        class="btn icon auto"
+        :class="{ active: store.autoWave }"
+        :title="store.autoWave ? 'Auto-Welle: nächste Welle startet automatisch' : 'Nächste Welle automatisch starten'"
+        @click="toggleAutoWave()"
+      >
+        🔁
+      </button>
       <button
         v-if="!store.mp.active"
         class="btn icon"
@@ -210,6 +251,10 @@ function exitToMenu(): void {
   background: var(--accent);
   color: #10151c;
 }
+.icon.auto.active {
+  background: #59b34d;
+  color: #fff;
+}
 .icon.danger:hover {
   background: #a33;
   color: #fff;

src/components/PauseOverlay.vue

@@ -4,6 +4,7 @@ import { engine } from '@/game/engine'
 
 function menu(): void {
   engine.setPaused(false)
+  engine.abandon() // record stats/crystals so the running round is not lost
   store.screen = 'menu'
 }
 </script>

src/components/UserProfileBar.vue

@@ -49,7 +49,9 @@ async function doLogout(): Promise<void> {
 .profile-bar {
   display: flex;
   align-items: center;
+  flex-wrap: wrap;
   gap: 8px;
+  max-width: 100%;
   background: var(--panel);
   border: 1px solid var(--panel-border);
   border-radius: 12px;
@@ -79,6 +81,25 @@ async function doLogout(): Promise<void> {
   padding: 5px 10px;
   cursor: pointer;
 }
+
+/* Phones: chips wrap into compact rows instead of overflowing */
+@media (max-width: 560px) {
+  .profile-bar {
+    gap: 5px;
+    padding: 5px 8px;
+  }
+  .crystals {
+    font-size: 13px;
+  }
+  .name {
+    font-size: 11.5px;
+    max-width: 92px;
+  }
+  .chip {
+    font-size: 11px;
+    padding: 4px 8px;
+  }
+}
 .chip:hover {
   border-color: var(--accent);
 }

src/game/engine.ts

@@ -575,6 +575,24 @@ export class GameEngine {
     this.onGameEnd?.({ win, score: this.score, wave: this.waveNo, kills: this.kills, crystalsEarned })
   }
 
+  /**
+   * Solo: leaving a running game via "zum Hauptmenü"/Pause-Menü. Records the
+   * run (best score, stats, crystals — counted as a defeat) so progress from
+   * endless runs or early exits is not lost. No-ops when no game is running
+   * or the result was already reported by finish().
+   */
+  abandon(): void {
+    if (this.mpGameActive) return
+    if (this.phase !== 'wave' && this.phase !== 'intermission') return
+    const bestBefore = loadBest(this.difficulty, this.mapId)
+    const best = Math.max(bestBefore, this.score)
+    if (typeof localStorage !== 'undefined') {
+      localStorage.setItem(bestScoreKey(this.difficulty, this.mapId), String(best))
+    }
+    const crystalsEarned = calcCrystalsEarned(this.waveNo, this.score, false)
+    this.onGameEnd?.({ win: false, score: this.score, wave: this.waveNo, kills: this.kills, crystalsEarned })
+  }
+
   private spawnEnemy(kind: EnemyKind): void {
     const def = ENEMIES[kind]
     const diff = DIFFICULTIES[this.difficulty]

src/game/store.ts

@@ -41,6 +41,9 @@ export const store = reactive({
 
   buildType: null as TowerKind | null,
   hoverValid: false,
+
+  /** automatically start the next wave as soon as intermission begins */
+  autoWave: typeof localStorage !== 'undefined' && localStorage.getItem('trxtd-autowave') === '1',
   selected: null as SelectedTowerInfo | null,
   obstacle: null as { tx: number; ty: number; type: 'tree' | 'rock'; cost: number } | null,