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, 86 deletions

diff --git a/issues/011-add-timeline-view.md b/issues/011-add-timeline-view.md
deleted file mode 100644
index 49e744a..0000000
--- a/issues/011-add-timeline-view.md
+++ /dev/null
@@ -1,86 +0,0 @@
-# [FEATURE] Add timeline view
-
-## Description
-Add timeline view.
-
-## User Story
-As a user, I want a timeline/agenda view so I can see my day's schedule visually.
-
-## Technical Context
-- New view aggregating multiple data sources by time
-- Requires merging tasks + meals + (future) calendar events
-- New tab or view mode in existing UI
-
-## Test Strategy
-
-### Unit Test (Red)
-**File:** `internal/handlers/handlers_test.go`
-
-```go
-func TestBuildTimeline(t *testing.T) {
-    tasks := []Task{{Name: "Task 1", DueDate: todayAt(10, 0)}}
-    meals := []Meal{{Name: "Lunch", Date: today, Type: "lunch"}}  // lunch = 12:00
-
-    timeline := BuildTimeline(tasks, meals)
-
-    assert.Len(t, timeline, 2)
-    assert.Equal(t, "Task 1", timeline[0].Title)
-    assert.Equal(t, "Lunch", timeline[1].Title)
-}
-
-func TestTimelineItemsSortedByTime(t *testing.T) {
-    // Items from different sources
-    // Assert sorted by timestamp regardless of source
-}
-```
-
-### E2E Test (Red)
-Timeline renders with correct order and time markers.
-
-## Proposed Approach
-
-1. **Data Structure:**
-   ```go
-   type TimelineItem struct {
-       Time     time.Time
-       Title    string
-       Source   string  // "task", "meal", "calendar"
-       Type     string  // source-specific type
-       URL      string
-       Metadata map[string]any
-   }
-   ```
-
-2. **Handler:**
-   - New endpoint `GET /timeline` or extend tab handler
-   - Aggregate items from tasks, meals, (future) calendar
-   - Sort by time ascending
-   - Group by hour or time block
-
-3. **UI:**
-   - Vertical timeline with time gutter on left
-   - Color-coded by source
-   - Expandable items for details
-
-4. **Meal time mapping:**
-   - breakfast: 08:00
-   - lunch: 12:00
-   - dinner: 18:00
-   - snack: configurable or omit from timeline
-
-## Affected Components
-- `internal/handlers/handlers.go` or `internal/handlers/timeline.go` (new)
-- `internal/handlers/handlers_test.go`
-- `internal/models/types.go` (TimelineItem struct)
-- `web/templates/partials/timeline-tab.html` (new)
-- `web/templates/index.html` (add tab)
-
-## Definition of Done
-- [ ] Timeline view accessible from UI
-- [ ] Tasks with times appear at correct position
-- [ ] Meals appear at appropriate meal times
-- [ ] Items sorted chronologically
-- [ ] Visual time markers/gutter
-- [ ] Color coding by source
-- [ ] Unit tests for timeline building
-- [ ] E2E test for rendering