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, 36 deletions

diff --git a/issues/task_002_add_authentication.md b/issues/task_002_add_authentication.md
deleted file mode 100644
index 018fff0..0000000
--- a/issues/task_002_add_authentication.md
+++ /dev/null
@@ -1,36 +0,0 @@
-# Task: Add Authentication
-
-## Goal
-Implement session-based authentication to secure the application for public deployment.
-
-## Plan
-
-1.  **Dependencies:**
-    *   Add `github.com/alexedwards/scs/v2` (Session management).
-    *   Add `github.com/alexedwards/scs/sqlite3store` (SQLite store for sessions).
-    *   Add `golang.org/x/crypto/bcrypt` (Password hashing).
-
-2.  **Database Schema:**
-    *   Create migration `migrations/003_add_auth.sql`.
-    *   Create `users` table (`id`, `username`, `password_hash`).
-    *   Create `sessions` table (required by `scs` SQLite store).
-
-3.  **Core Logic (`internal/auth`):**
-    *   Create `AuthService` to handle login, logout, and password verification.
-    *   Implement `User` model.
-
-4.  **Configuration:**
-    *   Update `Config` to include `SessionSecret` (for cookie encryption, if needed, though `scs` handles this well).
-
-5.  **Handlers & Middleware:**
-    *   Initialize `SessionManager` in `main.go`.
-    *   Create `LoginHandler` (GET/POST).
-    *   Create `LogoutHandler` (POST).
-    *   Create `AuthMiddleware` to protect routes.
-
-6.  **UI:**
-    *   Create `web/templates/login.html`.
-    *   Update `web/templates/base.html` (or similar) to show Logout button when logged in.
-
-7.  **Seed Data:**
-    *   Create a CLI command or startup check to ensure a default admin user exists (or provide instructions to create one).