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+# Phase 2: The Productivity OS (Interactive & Refined)
+
+This phase transforms the dashboard into a primary interface with write capabilities, smart sorting, and a refined "Glassmorphism" UI.
+
+## 1. The Unified Atom Model
+**Status:** [ ] Pending
+
+```text
+Define `models.Atom` to abstract over Trello, Todoist, Obsidian, and PlanToEat.
+Implement mapper functions.
+
+1.  **Model:** Create `internal/models/atom.go` with:
+    - AtomSource enum (trello, todoist, obsidian, plantoeat)
+    - AtomType enum (task, note, meal)
+    - Atom struct with normalized fields (ID, Title, Description, DueDate, Priority, etc.)
+    - UI helper fields (SourceIcon, ColorClass)
+    - Raw field for preserving original data
+2.  **Mappers:** Implement converter functions:
+    - TaskToAtom(Task) -> Atom
+    - CardToAtom(Card) -> Atom
+    - NoteToAtom(Note) -> Atom
+    - MealToAtom(Meal) -> Atom
+3.  **Priority Mapping:** Normalize priority scales to 1-4 (Low to Urgent)
+4.  **Color Mapping:** Assign brand colors (Trello=Blue, Todoist=Red, Obsidian=Purple, PlanToEat=Green)
+```
+
+## 2. Information Architecture: The 4-Tab Split
+**Status:** [ ] Pending
+
+```text
+Refactor the frontend and router to support 4 distinct tabs.
+
+1.  **Templates:** Update `web/templates/index.html` navigation to:
+    - Tasks (Todoist + Due Trello)
+    - Planning (Trello Boards)
+    - Notes (Obsidian)
+    - Meals (PlanToEat)
+2.  **Handlers:** Create/Update handlers in `internal/handlers/tabs.go` (new file):
+    - `HandleTasksTab`: Aggregates Todoist + Trello cards with due dates.
+    - `HandlePlanningTab`: Returns Trello boards (excluding cards shown in Tasks?).
+    - `HandleMealsTab`: Returns PlanToEat data.
+3.  **Router:** Register new routes `/tabs/tasks`, `/tabs/planning`, `/tabs/meals`.
+```
+
+## 3. Trello: Smart Sorting & Logic
+**Status:** [ ] Pending
+
+```text
+Enhance Trello sorting in `internal/api/trello.go` and `internal/store/sqlite.go`.
+
+1.  **Backend:** Update `GetBoardsWithCards` to sort by:
+    - Primary: Has active cards?
+    - Secondary: Newest card modification date (requires parsing Trello ID hex timestamp).
+    - Tertiary: Number of cards.
+2.  **Store:** Update SQL query in `GetBoards` to reflect this sort order.
+```
+
+## 4. Todoist: "Due First" Sorting
+**Status:** [ ] Pending
+
+```text
+Ensure Todoist tasks are sorted by urgency.
+
+1.  **Store:** Edit `internal/store/sqlite.go` -> `GetTasks`.
+2.  **Query:** Update ORDER BY clause:
+    - `CASE WHEN due_date IS NULL THEN 1 ELSE 0 END` (Due dates first)
+    - `due_date ASC` (Earliest first)
+    - `priority DESC` (High priority next)
+```
+
+## 5. Obsidian: Search & Categorization
+**Status:** [ ] Pending
+
+```text
+Enhance Obsidian to support search and categorization.
+
+1.  **Backend:** Edit `internal/api/obsidian.go`.
+    - Add `SearchNotes(query string)`.
+    - Add logic to group notes by tags (e.g., #planning, #task, #meal).
+2.  **Frontend:** Add a Search Bar to the Notes tab.
+    - HTMX trigger: `hx-get="/tabs/notes/search" hx-trigger="keyup changed delay:500ms"`.
+```
+
+## 6. Visual Overhaul: "Muted Landscape"
+**Status:** [ ] Pending
+
+```text
+Apply the new visual design.
+
+1.  **CSS:** Update Tailwind config for "muted" palette.
+2.  **Layout:** Add a full-screen background image container.
+3.  **Components:** Update cards to use `bg-white/80 backdrop-blur-md` (Glassmorphism).
+```
+
+## 7. Write Operations (The "Primary Interface" Goal)
+**Status:** [ ] Pending
+
+```text
+Implement the interactive features.
+
+1.  **Trello:** Implement `UpdateCard` (Archive) and "Mark Complete" button.
+2.  **Obsidian:** Implement `CreateNote` (Quick Capture) and "New Note" form.
+```
+
+## 8. Mobile PWA
+**Status:** [ ] Pending
+
+```text
+Make it installable.
+
+1.  Create `web/static/manifest.json`.
+2.  Add icons.
+3.  Link manifest in `index.html`.
+```