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/routes/schedule.py

@@ -0,0 +1,86 @@
+"""4-week schedule calendar routes.
+
+Displays a calendar view showing which workout day maps to which date.
+"""
+
+from datetime import date, timedelta
+
+import structlog
+from fastapi import APIRouter, Depends, Request
+from fastapi.responses import HTMLResponse
+from sqlmodel import Session
+
+from app.database import get_db_session
+from app.models.user import User
+from app.services.exercise_service import ExerciseService
+from app.services.workout_session_service import WorkoutSessionService
+from app.utils.auth import get_current_admin_user, get_active_profile_id
+
+logger = structlog.get_logger(__name__)
+
+router = APIRouter(prefix="/schedule", tags=["schedule"])
+
+
+@router.get("", response_class=HTMLResponse)
+async def schedule_view(
+    request: Request,
+    session: Session = Depends(get_db_session),
+    admin: User = Depends(get_current_admin_user),
+):
+    """Render the 4-week schedule calendar.
+
+    Shows a 4-week grid where each training day is mapped to a
+    calendar date. Days with completed sessions are highlighted.
+    """
+    active_profile_id = get_active_profile_id(request)
+    active_profile = (
+        session.get(User, active_profile_id)
+        if active_profile_id
+        else None
+    )
+
+    exercise_service = ExerciseService(session)
+    workout_days = exercise_service.list_workout_days()
+
+    # Build 4-week calendar starting from Monday of current week
+    today = date.today()
+    monday = today - timedelta(days=today.weekday())
+
+    weeks = []
+    completed_dates = set()
+
+    # Get completed sessions for highlighting
+    if active_profile_id:
+        ws_service = WorkoutSessionService(session)
+        sessions_list = ws_service.list_sessions(
+            user_id=active_profile_id, limit=100,
+        )
+        completed_dates = {ws.date for ws in sessions_list}
+
+    # 4 workout days per week, 4 weeks
+    for week_num in range(4):
+        week_start = monday + timedelta(weeks=week_num)
+        week_data = {
+            "week_number": week_num + 1,
+            "days": [],
+        }
+        for day_offset, workout_day in enumerate(workout_days):
+            training_date = week_start + timedelta(days=day_offset)
+            is_today = training_date == today
+            is_completed = training_date in completed_dates
+
+            week_data["days"].append({
+                "workout_day": workout_day,
+                "date": training_date,
+                "is_today": is_today,
+                "is_completed": is_completed,
+            })
+        weeks.append(week_data)
+
+    templates = request.app.state.templates
+    return templates.TemplateResponse("pages/schedule.html", {
+        "request": request,
+        "weeks": weeks,
+        "active_profile": active_profile,
+        "admin": admin,
+    })