Add week navigation and calendar picker to dashboard

Dashboard now accepts ?week= param like meal-plan and shopping-list.
Header shows prev/next arrows, an <input type="week"> picker, and a
"Today" button when browsing a past/future week. Edit Plan and Shopping
List links carry the current week so they open in sync.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/app/app.py b/app/app.py
index e3e45d9..da5dc8d 100644
--- a/app/app.py
+++ b/app/app.py
@@ -325,7 +325,7 @@ def logout():
 
 @app.route('/')
 def index():
-    ws = week_start_from_str(None)
+    ws = week_start_from_str(request.args.get('week'))
     dates = week_dates(ws)
     uid = current_user.id if current_user.is_authenticated else 1
     db = database.get_db()
@@ -345,6 +345,9 @@ def index():
         stat_map=stat_map, meal_types=MEAL_TYPES,
         cuisine_emoji=CUISINE_EMOJI_MAP,
         today_str=date.today().isoformat(),
+        prev_week=(ws - timedelta(weeks=1)).isoformat(),
+        next_week=(ws + timedelta(weeks=1)).isoformat(),
+        is_current_week=(ws == week_start_from_str(None)),
     )