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/schedule.html

@@ -0,0 +1,50 @@
+{% extends "base.html" %}
+
+{% block title %}4-Week Schedule -- SneakySwole{% endblock %}
+
+{% block content %}
+<hgroup>
+    <h1>4-Week Schedule</h1>
+    {% if active_profile %}
+    <p>Schedule for: <strong>{{ active_profile.display_name }}</strong></p>
+    {% else %}
+    <p>No profile selected -- <a href="/profiles">select one</a></p>
+    {% endif %}
+</hgroup>
+
+{% for week in weeks %}
+<article>
+    <header>
+        <h3>Week {{ week.week_number }}</h3>
+    </header>
+    <div class="grid">
+        {% for day in week.days %}
+        <div style="text-align:center;
+                    padding:1rem;
+                    border-radius:0.5rem;
+                    {% if day.is_today %}
+                    border: 2px solid var(--pico-primary);
+                    {% endif %}
+                    {% if day.is_completed %}
+                    background: rgba(99, 102, 241, 0.15);
+                    {% endif %}">
+            <strong>{{ day.workout_day.name }}</strong>
+            <br>
+            <small>{{ day.date.strftime('%b %d') }}</small>
+            {% if day.is_completed %}
+            <br><mark>Done</mark>
+            {% endif %}
+            {% if day.is_today %}
+            <br><small><strong>Today</strong></small>
+            {% endif %}
+            <br>
+            <a href="/workouts/{{ day.workout_day.name|lower|replace(' ', '-') }}"
+               style="font-size:0.8rem;">
+                Start
+            </a>
+        </div>
+        {% endfor %}
+    </div>
+</article>
+{% endfor %}
+{% endblock %}