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/dashboard.html

@@ -0,0 +1,46 @@
+{% extends "base.html" %}
+
+{% block title %}Dashboard -- SneakySwole{% endblock %}
+
+{% block head_extra %}
+<script src="https://cdn.jsdelivr.net/npm/chart.js@4"></script>
+{% endblock %}
+
+{% block content %}
+<hgroup>
+    <h1>Progress Dashboard</h1>
+    {% if active_profile %}
+    <p>{{ active_profile.display_name }}'s training overview</p>
+    {% else %}
+    <p>No profile selected -- <a href="/profiles">select one</a></p>
+    {% endif %}
+</hgroup>
+
+{% if stats %}
+<!-- Summary Stats -->
+<div class="grid">
+    {% include "partials/stats_card.html" %}
+</div>
+
+<!-- Volume by Day Chart -->
+<article>
+    <header><h3>Volume by Workout Day</h3></header>
+    {% include "partials/volume_chart.html" %}
+</article>
+
+<!-- Exercise Progress Links -->
+<article>
+    <header><h3>Per-Exercise Progress</h3></header>
+    <ul>
+        {% for exercise in exercises %}
+        <li>
+            <a href="/dashboard/exercise/{{ exercise.id }}">
+                {{ exercise.name }}
+            </a>
+            <small> -- {{ exercise.workout_day }} Day</small>
+        </li>
+        {% endfor %}
+    </ul>
+</article>
+{% endif %}
+{% endblock %}