feat: persistent sessions support, remove track_map, add characteristics + tracks views

- Remove obsolete track_map use case from types, views, and router
- Delete TrackMapView.vue (superseded by persistent TrackDetailView)
- Auto-analyze in handleBuildTrack before building track model
- Add CharacteristicsView: expandable car cards with aggregated shift-point
  profiles (gear RPM/speed ranges, recommended shift RPM)
- Add TracksView + TrackDetailView + tracks Pinia store (Canvas 2D geometry)
- Add characteristics API client functions (listCarProfiles)
- Add tracks and characteristics nav items and routes
- Update Game type values to match backend snake_case (project_cars_1/2)
- Update use_case types and labels (remove track_map, keep track_mapping)

src/views/SessionDetailView.vue

@@ -4,6 +4,7 @@ import { useRoute, useRouter } from 'vue-router'
 import { useSessionsStore } from '@/stores/sessions'
 import type { ShiftPointAnalysis, TrackMapAnalysis } from '@/types'
 import { isShiftPointAnalysis, isTrackMapAnalysis } from '@/utils/analysis'
+import * as api from '@/api/client'
 
 const props = defineProps<{
   id: string
@@ -100,8 +101,6 @@ function viewAnalysis() {
   if (!session.value) return
   if (session.value.use_case === 'shift_points') {
     router.push({ name: 'shift-points', params: { id: session.value.id } })
-  } else if (session.value.use_case === 'track_map') {
-    router.push({ name: 'track-map', params: { id: session.value.id } })
   }
 }
 
@@ -121,6 +120,37 @@ async function handleDeleteRun(runId: string, runLabel: string) {
 async function handleReopen() {
   await store.reopenSession(sessionId.value)
 }
+
+const buildingTrack = ref(false)
+const buildTrackError = ref<string | null>(null)
+const buildTrackSuccess = ref(false)
+
+const isTrackMapping = computed(() => session.value?.use_case === 'track_mapping')
+
+const hasLeftRun = computed(() =>
+  session.value?.runs.some((r) => r.label?.toLowerCase() === 'left' && r.status === 'stopped') ?? false,
+)
+
+const hasRightRun = computed(() =>
+  session.value?.runs.some((r) => r.label?.toLowerCase() === 'right' && r.status === 'stopped') ?? false,
+)
+
+const canBuildTrack = computed(() => isCompleted.value && hasLeftRun.value && hasRightRun.value)
+
+async function handleBuildTrack() {
+  buildingTrack.value = true
+  buildTrackError.value = null
+  buildTrackSuccess.value = false
+  try {
+    await store.reAnalyze(sessionId.value)
+    await api.buildTrackModel({ session_id: sessionId.value })
+    buildTrackSuccess.value = true
+  } catch (e: unknown) {
+    buildTrackError.value = e instanceof Error ? e.message : 'Failed to build track model'
+  } finally {
+    buildingTrack.value = false
+  }
+}
 </script>
 
 <template>
@@ -310,7 +340,7 @@ async function handleReopen() {
           </div>
 
           <div class="flex gap-2">
-            <button class="btn btn-primary" @click="viewAnalysis">
+            <button v-if="session.use_case === 'shift_points'" class="btn btn-primary" @click="viewAnalysis">
               📊 View Full Analysis
             </button>
             <button class="btn btn-secondary" @click="handleReAnalyze">
@@ -329,6 +359,42 @@ async function handleReopen() {
           </button>
         </div>
       </section>
+
+      <!-- Track Mapping: Build Track Model -->
+      <section v-if="isTrackMapping && isCompleted" class="card mb-3">
+        <div class="card-header">
+          <h2>Build Track Model</h2>
+        </div>
+        <div v-if="canBuildTrack">
+          <p class="text-secondary mb-2" style="font-size: 0.85rem">
+            Both boundary runs (left + right) are recorded. Build the persistent track model to enable corner analysis and sector timing.
+          </p>
+          <button
+            class="btn btn-primary"
+            :disabled="buildingTrack"
+            @click="handleBuildTrack"
+          >
+            {{ buildingTrack ? 'Building...' : 'Build Track Model' }}
+          </button>
+          <div v-if="buildTrackSuccess" class="text-success mt-2" style="font-size: 0.85rem">
+            Track model built successfully. <RouterLink to="/tracks">View in Tracks →</RouterLink>
+          </div>
+          <div v-if="buildTrackError" class="text-error mt-2" style="font-size: 0.85rem">
+            {{ buildTrackError }}
+          </div>
+        </div>
+        <div v-else class="text-secondary" style="font-size: 0.85rem">
+          <p>Requires 2 completed runs labeled "left" and "right".</p>
+          <div class="flex gap-2 mt-1">
+            <span :class="hasLeftRun ? 'text-success' : 'text-muted'">
+              {{ hasLeftRun ? '✓' : '○' }} Left boundary
+            </span>
+            <span :class="hasRightRun ? 'text-success' : 'text-muted'">
+              {{ hasRightRun ? '✓' : '○' }} Right boundary
+            </span>
+          </div>
+        </div>
+      </section>
     </template>
   </div>
 </template>