feat: add Phase 5 Progression & Analytics — smart suggestions, dashboard, schedule

Add auto-progression engine (ProgressionService) with rep increase, weight
increase, deload, and felt-easy acceleration rules. Add AnalyticsService for
user stats, exercise progress charts, and volume-by-day data. New dashboard
and schedule routes with Chart.js visualizations. Progression badges shown
inline on workout day view. Navigation updated with Dashboard and Schedule links.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/templates/partials/progress_chart.html

@@ -0,0 +1,56 @@
+<canvas id="progress-chart" style="max-height:300px;"></canvas>
+<p id="progress-chart-empty" style="display:none;">No data yet.</p>
+<script>
+(function() {
+    var data = {{ progress_data_json|safe }};
+
+    if (!data.dates || data.dates.length === 0) {
+        document.getElementById('progress-chart').style.display = 'none';
+        document.getElementById('progress-chart-empty').style.display = 'block';
+        return;
+    }
+
+    new Chart(document.getElementById('progress-chart'), {
+        type: 'line',
+        data: {
+            labels: data.dates,
+            datasets: [
+                {
+                    label: 'Avg Reps',
+                    data: data.reps,
+                    borderColor: 'rgba(99, 102, 241, 1)',
+                    backgroundColor: 'rgba(99, 102, 241, 0.2)',
+                    yAxisID: 'y-reps',
+                    tension: 0.3
+                },
+                {
+                    label: 'Weight (lbs)',
+                    data: data.weights,
+                    borderColor: 'rgba(244, 63, 94, 1)',
+                    backgroundColor: 'rgba(244, 63, 94, 0.2)',
+                    yAxisID: 'y-weight',
+                    tension: 0.3
+                }
+            ]
+        },
+        options: {
+            responsive: true,
+            interaction: { mode: 'index', intersect: false },
+            scales: {
+                'y-reps': {
+                    type: 'linear', display: true, position: 'left',
+                    title: { display: true, text: 'Reps', color: '#ccc' },
+                    ticks: { color: '#ccc' }
+                },
+                'y-weight': {
+                    type: 'linear', display: true, position: 'right',
+                    title: { display: true, text: 'Weight (lbs)', color: '#ccc' },
+                    ticks: { color: '#ccc' },
+                    grid: { drawOnChartArea: false }
+                },
+                x: { ticks: { color: '#ccc' } }
+            }
+        }
+    });
+})();
+</script>