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, 3 insertions, 3 deletions

diff --git a/internal/api/plantoeat.go b/internal/api/plantoeat.go
index 5c24cc1..ab5d2cd 100644
--- a/internal/api/plantoeat.go
+++ b/internal/api/plantoeat.go
@@ -11,6 +11,7 @@ import (
 
 	"github.com/PuerkitoBio/goquery"
 
+	"task-dashboard/internal/config"
 	"task-dashboard/internal/models"
 )
 
@@ -90,8 +91,7 @@ func parsePlannerHTML(body io.Reader, days int) ([]models.Meal, error) {
 	}
 
 	var meals []models.Meal
-	now := time.Now()
-	today := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
+	today := config.Today()
 	endDate := today.AddDate(0, 0, days)
 
 	// PlanToEat structure:
@@ -108,7 +108,7 @@ func parsePlannerHTML(body io.Reader, days int) ([]models.Meal, error) {
 			return
 		}
 
-		mealDate, err := time.Parse("2006-01-02", dateStr)
+		mealDate, err := config.ParseDateInDisplayTZ(dateStr)
 		if err != nil {
 			return
 		}