Merge the single and multi strategy panels into one

The single "Strategy" panel and "Strategies (multi)" were redundant: the multi
panel with one row is exactly the single-strategy behaviour. Remove StrategyPanel
and make "Strategies" the one trading panel. Presets move into it (load adds a
row, per-row Save), and the header now reports "N strategies" when several run
instead of only the first. Deletes the obsolete component and its test; adds
preset tests to the multi-strategy suite.

frontend/src/App.vue

@@ -9,7 +9,6 @@ import MultiStrategyPanel from './components/MultiStrategyPanel.vue'
 import OrdersTable from './components/OrdersTable.vue'
 import PositionsTable from './components/PositionsTable.vue'
 import StatusCards from './components/StatusCards.vue'
-import StrategyPanel from './components/StrategyPanel.vue'
 import SweepPanel from './components/SweepPanel.vue'
 
 const status = ref({
@@ -35,6 +34,27 @@ const strategiesLoading = ref(true)
 const presets = ref([])
 const multiStatus = ref({ running: false, strategies: [], total_pnl: 0, equity: 0 })
 const liveCheck = ref({ ok: true, mode: 'paper', blockers: [] })
+
+const runningLabel = computed(() => {
+  const list = multiStatus.value.strategies || []
+  if (!list.length) return 'Idle'
+  if (list.length === 1) {
+    return `Running: ${list[0].strategy_name || list[0].strategy_key}`
+  }
+  return `Running: ${list.length} strategies`
+})
+
+const scopeLabel = computed(() => {
+  const list = multiStatus.value.strategies || []
+  if (!list.length) {
+    return status.value.symbol ? `${status.value.symbol} ${status.value.timeframe}` : ''
+  }
+  const first = list[0]
+  const sameScope = list.every(
+    (s) => s.symbol === first.symbol && s.timeframe === first.timeframe,
+  )
+  return sameScope ? `${first.symbol} ${first.timeframe}` : `${list.length} pairs`
+})
 const positions = ref([])
 const orders = ref([])
 const events = ref([])
@@ -98,25 +118,6 @@ async function handleDeletePreset(id) {
   await loadPresets()
 }
 
-async function handleStart(payload) {
-  if (liveCheck.value.mode === 'live' && !liveCheck.value.ok) {
-    status.value = {
-      ...status.value,
-      error: 'Live trading blocked: ' + liveCheck.value.blockers.join('; '),
-    }
-    return
-  }
-  busy.value = true
-  try {
-    status.value = await api.startBot(payload)
-    await refreshAll()
-  } catch (error) {
-    status.value = { ...status.value, error: error.response?.data?.detail || error.message }
-  } finally {
-    busy.value = false
-  }
-}
-
 async function refreshMulti() {
   multiStatus.value = await api.getMultiStatus()
 }
@@ -168,29 +169,6 @@ async function handleKillMany() {
   }
 }
 
-async function handleStop() {
-  busy.value = true
-  try {
-    status.value = await api.stopBot()
-    await refreshMulti()
-    await refreshAll()
-  } finally {
-    busy.value = false
-  }
-}
-
-async function handleKill() {
-  busy.value = true
-  try {
-    status.value = await api.killBot('manual kill switch')
-    await refreshAll()
-  } catch (error) {
-    status.value = { ...status.value, error: error.response?.data?.detail || error.message }
-  } finally {
-    busy.value = false
-  }
-}
-
 async function handleClose(id) {
   try {
     status.value = await api.closePosition(id)
@@ -314,9 +292,8 @@ onUnmounted(() => {
         </span>
       </div>
       <div class="text-xs text-slate-400">
-        <span v-if="status.strategy_name">Running: {{ status.strategy_name }}</span>
-        <span v-else>Idle</span>
-        <span v-if="status.symbol"> · {{ status.symbol }} {{ status.timeframe }}</span>
+        <span>{{ runningLabel }}</span>
+        <span v-if="scopeLabel"> · {{ scopeLabel }}</span>
       </div>
     </header>
 
@@ -344,27 +321,17 @@ onUnmounted(() => {
 
     <StatusCards :status="status" />
 
-    <StrategyPanel
-      :strategies="strategies"
-      :status="status"
-      :busy="busy"
-      :presets="presets"
-      :loading="strategiesLoading"
-      @start="handleStart"
-      @stop="handleStop"
-      @kill="handleKill"
-      @save-preset="handleSavePreset"
-      @delete-preset="handleDeletePreset"
-    />
-
     <MultiStrategyPanel
       :strategies="strategies"
       :multi-status="multiStatus"
+      :presets="presets"
       :busy="busy"
       :loading="strategiesLoading"
       @start-many="handleStartMany"
       @stop="handleStopMany"
       @kill="handleKillMany"
+      @save-preset="handleSavePreset"
+      @delete-preset="handleDeletePreset"
     />
 
     <BacktestPanel :strategies="strategies" :status="status" :loading="strategiesLoading" />