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/pages/exercise_progress.html

@@ -0,0 +1,48 @@
+{% extends "base.html" %}
+
+{% block title %}{{ exercise.name }} Progress -- SneakySwole{% endblock %}
+
+{% block head_extra %}
+<script src="https://cdn.jsdelivr.net/npm/chart.js@4"></script>
+{% endblock %}
+
+{% block content %}
+<hgroup>
+    <h1>{{ exercise.name }}</h1>
+    <p>{{ exercise.muscle_group }} | {{ exercise.workout_day }} Day</p>
+</hgroup>
+
+<!-- Progression Suggestion -->
+{% if suggestion %}
+<article>
+    <header><h3>Next Workout Suggestion</h3></header>
+    <p>{{ suggestion.message }}</p>
+    <div class="grid">
+        <div>
+            <small>Suggested Reps</small>
+            <p style="font-size:1.5rem; font-weight:700;">
+                {{ suggestion.suggested_reps }}
+            </p>
+        </div>
+        <div>
+            <small>Suggested Weight</small>
+            <p style="font-size:1.5rem; font-weight:700;">
+                {{ suggestion.suggested_weight }}
+            </p>
+        </div>
+        <div>
+            <small>Progression Type</small>
+            <p><mark>{{ suggestion.progression_type }}</mark></p>
+        </div>
+    </div>
+</article>
+{% endif %}
+
+<!-- Progress Chart -->
+<article>
+    <header><h3>Rep and Weight Trends</h3></header>
+    {% include "partials/progress_chart.html" %}
+</article>
+
+<a href="/dashboard" role="button" class="outline">Back to Dashboard</a>
+{% endblock %}