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, 37 deletions

diff --git a/issues/task_001_remove_obsidian.md b/issues/task_001_remove_obsidian.md
deleted file mode 100644
index c02a785..0000000
--- a/issues/task_001_remove_obsidian.md
+++ /dev/null
@@ -1,37 +0,0 @@
-# Remove Obsidian Functionality (COMPLETED)
-
-**Description:**
-Remove all code related to Obsidian integration to prepare for public server deployment. Obsidian relies on local filesystem access, which is not suitable for a public web server environment.
-
-**Status:**
-✅ COMPLETED
-
-**Changes Made:**
-1.  **Core Logic:**
-    *   Deleted `internal/api/obsidian.go` and `internal/api/obsidian_test.go`.
-    *   Removed `ObsidianAPI` interface from `internal/api/interfaces.go`.
-    *   Removed `Note` struct from `internal/models/types.go`.
-    *   Removed `SourceObsidian` and `NoteToAtom` from `internal/models/atom.go`.
-
-2.  **Configuration:**
-    *   Removed `ObsidianVaultPath` and `HasObsidian()` from `internal/config/config.go`.
-    *   Removed `OBSIDIAN_VAULT_PATH` from `.env.example`.
-
-3.  **Handlers:**
-    *   Removed `obsidianClient` field from `Handler` struct in `internal/handlers/handlers.go`.
-    *   Updated `New` function signature.
-    *   Removed `HandleNotesTab` and `fetchNotes` methods.
-    *   Removed `HandleNotes` from `internal/handlers/tabs.go`.
-    *   Removed `obsidian` logic from `aggregateData`.
-
-4.  **UI:**
-    *   Removed `web/templates/partials/obsidian-notes.html`.
-    *   Removed `web/templates/partials/notes-tab.html`.
-    *   Removed "Notes" tab button from `web/templates/index.html`.
-    *   Removed `obsidian` color from `tailwind.config.js`.
-
-5.  **Main Entry Point:**
-    *   Updated `cmd/dashboard/main.go` (Handled by Implementor).
-
-6.  **Tests:**
-    *   Updated `test/acceptance_test.go` and `internal/handlers/handlers_test.go`.