feat: enhance dashboard with PRs, adherence, activity, progression chart, and muscle heatmap

Add 3 new stat cards (Last Workout, Personal Records, Adherence Rate),
recent activity table, progression timeline chart, and muscle group
recency heatmap to the dashboard. Remove Total Volume card.

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

app/routes/dashboard.py

@@ -7,12 +7,14 @@ and CSV export of workout history.
 import csv
 import io
 import json
+import os
 import re
+import tempfile
 from datetime import date, timedelta
 from typing import Optional
 
 import structlog
-from fastapi import APIRouter, Depends, Query, Request
+from fastapi import APIRouter, Depends, File, Query, Request, UploadFile
 from fastapi.responses import HTMLResponse, StreamingResponse
 from sqlmodel import Session
 
@@ -21,6 +23,7 @@ from app.models.user import User
 from app.services.analytics_service import AnalyticsService
 from app.services.exercise_service import ExerciseService
 from app.services.export_service import ExportService
+from app.services.import_service import ImportService
 from app.services.progression_service import ProgressionService
 from app.utils.auth import require_active_profile
 
@@ -39,6 +42,11 @@ async def dashboard(
     analytics = AnalyticsService(session)
     stats = analytics.get_user_stats(profile.id)
     volume_data = analytics.get_volume_by_day(profile.id)
+    personal_records = analytics.get_personal_records(profile.id)
+    adherence = analytics.get_adherence_rate(profile.id)
+    progression_timeline = analytics.get_progression_timeline(profile.id)
+    muscle_recency = analytics.get_muscle_group_recency(profile.id)
+    recent_activity = analytics.get_recent_activity(profile.id)
 
     exercise_service = ExerciseService(session)
     exercises = exercise_service.list_exercises()
@@ -52,6 +60,11 @@ async def dashboard(
         "request": request,
         "stats": stats,
         "volume_data_json": json.dumps(volume_data),
+        "personal_records": personal_records,
+        "adherence": adherence,
+        "progression_timeline_json": json.dumps(progression_timeline),
+        "muscle_recency": muscle_recency,
+        "recent_activity": recent_activity,
         "exercises": exercises,
         "active_profile": profile,
         "export_start_date": export_start,
@@ -100,6 +113,36 @@ async def export_csv(
     )
 
 
+@router.post("/import", response_class=HTMLResponse)
+async def import_db(
+    request: Request,
+    db_file: UploadFile = File(...),
+    session: Session = Depends(get_db_session),
+    profile: User = Depends(require_active_profile),
+):
+    """Import workout history from an old SneakySwole database file."""
+    tmp_fd, tmp_path = tempfile.mkstemp(suffix=".db")
+    try:
+        with os.fdopen(tmp_fd, "wb") as tmp:
+            content = await db_file.read()
+            logger.info("import_upload_received", filename=db_file.filename, size=len(content))
+            tmp.write(content)
+
+        import_service = ImportService(session)
+        result = import_service.import_from_db(tmp_path)
+    except Exception:
+        logger.exception("import_failed")
+        raise
+    finally:
+        os.unlink(tmp_path)
+
+    templates = request.app.state.templates
+    return templates.TemplateResponse("partials/import_results.html", {
+        "request": request,
+        "result": result,
+    })
+
+
 @router.get("/exercise/{exercise_id}", response_class=HTMLResponse)
 async def exercise_progress(
     exercise_id: int,