Use configured timezone throughout codebase

- Add config/timezone.go with timezone utilities:
  - SetDisplayTimezone(), GetDisplayTimezone()
  - Now(), Today() - current time/date in display TZ
  - ParseDateInDisplayTZ(), ToDisplayTZ() - parsing helpers

- Initialize timezone at startup in main.go

- Update all datetime logic to use configured timezone:
  - handlers/handlers.go - all time.Now() calls
  - handlers/timeline.go - date parsing
  - handlers/timeline_logic.go - now calculation
  - models/atom.go - ComputeUIFields()
  - models/timeline.go - ComputeDaySection()
  - api/plantoeat.go - meal date parsing
  - api/todoist.go - due date parsing
  - api/trello.go - due date parsing

This ensures all dates/times display correctly regardless
of server timezone setting.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 0 insertions, 81 deletions

diff --git a/issues/013-quick-add-shopping-list.md b/issues/013-quick-add-shopping-list.md
deleted file mode 100644
index e09ab92..0000000
--- a/issues/013-quick-add-shopping-list.md
+++ /dev/null
@@ -1,81 +0,0 @@
-# [FEATURE] Quick add for shopping list items
-
-## Description
-Add a quick add interface for shopping list items.
-
-## User Story
-As a user, I want to quickly add items to my shopping list without navigating away.
-
-## Technical Context
-- Requires decision on backend: PlanToEat API vs local SQLite
-- May need new table `shopping_items` if local
-- Could integrate with modal menu from issue #002
-
-## Test Strategy
-
-### Unit Test (Red)
-**File:** `internal/store/sqlite_test.go`
-
-```go
-func TestAddShoppingItem(t *testing.T) {
-    store := setupTestStore(t)
-
-    err := store.AddShoppingItem(ShoppingItem{
-        Name:     "Milk",
-        Quantity: "1 gallon",
-    })
-
-    assert.NoError(t, err)
-
-    items, _ := store.GetShoppingItems()
-    assert.Len(t, items, 1)
-    assert.Equal(t, "Milk", items[0].Name)
-}
-```
-
-### E2E Test (Red)
-Quick-add form submits, item appears in list.
-
-## Proposed Approach
-
-1. **Decide backend:**
-   - Option A: PlanToEat API (if it supports shopping lists)
-   - Option B: Local SQLite table (simpler, offline-capable)
-
-2. **Database (if local):**
-   ```sql
-   CREATE TABLE shopping_items (
-       id INTEGER PRIMARY KEY AUTOINCREMENT,
-       name TEXT NOT NULL,
-       quantity TEXT,
-       checked BOOLEAN DEFAULT 0,
-       created_at DATETIME DEFAULT CURRENT_TIMESTAMP
-   );
-   ```
-
-3. **Handler:**
-   - `POST /api/shopping/add` — add item
-   - `GET /api/shopping` — list items
-   - `PUT /api/shopping/{id}/check` — toggle checked
-   - `DELETE /api/shopping/{id}` — remove item
-
-4. **UI:**
-   - Quick-add form in modal menu (integrate with #002) or meals tab
-   - Simple input: item name, optional quantity
-   - List view with checkboxes
-
-## Affected Components
-- `internal/store/sqlite.go` (new table/methods)
-- `internal/store/sqlite_test.go`
-- `internal/handlers/handlers.go` (new endpoints)
-- `web/templates/partials/shopping-list.html` (new)
-- Potentially `web/templates/partials/modal-menu.html` (from #002)
-
-## Definition of Done
-- [ ] Can add items via quick-add form
-- [ ] Items persisted (API or local)
-- [ ] Items displayed in list view
-- [ ] Can check/uncheck items
-- [ ] Can delete items
-- [ ] Unit tests for store operations
-- [ ] E2E test for add flow