Implement Unified Quick Add for Tasks tab (Phase 3 Step 8)

Add Quick Add form to create Todoist tasks or Trello cards directly
from the Tasks tab with optional due date support.

Features:
- HandleUnifiedAdd handler with due date parsing
- HandleGetListsOptions for dynamic Trello list loading
- Quick Add form with source toggle (Todoist/Trello)
- Date picker for due dates
- HX-Trigger refresh after successful creation
- Pass boards to tasks-tab template for board selector

Cleanup:
- Remove resolved issue tracking files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2 files changed, 91 insertions, 2 deletions

diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index b3bc8e4..20095fe 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -3,6 +3,7 @@ package handlers
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"html/template"
 	"log"
 	"net/http"
@@ -727,3 +728,89 @@ func (h *Handler) HandleCompleteAtom(w http.ResponseWriter, r *http.Request) {
 	// Return 200 OK with empty body to remove the element from DOM
 	w.WriteHeader(http.StatusOK)
 }
+
+// HandleUnifiedAdd creates a task in Todoist or a card in Trello from the Quick Add form
+func (h *Handler) HandleUnifiedAdd(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, "Failed to parse form", http.StatusBadRequest)
+		return
+	}
+
+	title := r.FormValue("title")
+	source := r.FormValue("source")
+	dueDateStr := r.FormValue("due_date")
+
+	if title == "" {
+		http.Error(w, "Title is required", http.StatusBadRequest)
+		return
+	}
+
+	// Parse due date if provided
+	var dueDate *time.Time
+	if dueDateStr != "" {
+		parsed, err := time.Parse("2006-01-02", dueDateStr)
+		if err == nil {
+			dueDate = &parsed
+		}
+	}
+
+	switch source {
+	case "todoist":
+		_, err := h.todoistClient.CreateTask(ctx, title, "", dueDate, 1)
+		if err != nil {
+			http.Error(w, "Failed to create Todoist task", http.StatusInternalServerError)
+			log.Printf("Error creating Todoist task: %v", err)
+			return
+		}
+		// Invalidate cache so fresh data is fetched
+		h.store.InvalidateCache("todoist_tasks")
+
+	case "trello":
+		listID := r.FormValue("list_id")
+		if listID == "" {
+			http.Error(w, "List is required for Trello", http.StatusBadRequest)
+			return
+		}
+		_, err := h.trelloClient.CreateCard(ctx, listID, title, "", dueDate)
+		if err != nil {
+			http.Error(w, "Failed to create Trello card", http.StatusInternalServerError)
+			log.Printf("Error creating Trello card: %v", err)
+			return
+		}
+		// Invalidate cache so fresh data is fetched
+		h.store.InvalidateCache("trello_boards")
+
+	default:
+		http.Error(w, "Invalid source", http.StatusBadRequest)
+		return
+	}
+
+	// Trigger a refresh of the tasks tab via HTMX
+	w.Header().Set("HX-Trigger", "refresh-tasks")
+	w.WriteHeader(http.StatusOK)
+}
+
+// HandleGetListsOptions returns HTML options for lists in a given board
+func (h *Handler) HandleGetListsOptions(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	boardID := r.URL.Query().Get("board_id")
+
+	if boardID == "" {
+		http.Error(w, "board_id is required", http.StatusBadRequest)
+		return
+	}
+
+	lists, err := h.trelloClient.GetLists(ctx, boardID)
+	if err != nil {
+		http.Error(w, "Failed to fetch lists", http.StatusInternalServerError)
+		log.Printf("Error fetching lists for board %s: %v", boardID, err)
+		return
+	}
+
+	w.Header().Set("Content-Type", "text/html")
+	for _, list := range lists {
+		fmt.Fprintf(w, `<option value="%s">%s</option>`, list.ID, list.Name)
+	}
+}
diff --git a/internal/handlers/tabs.go b/internal/handlers/tabs.go
index ce9c34f..74dfbe8 100644
--- a/internal/handlers/tabs.go
+++ b/internal/handlers/tabs.go
@@ -110,9 +110,11 @@ func (h *TabsHandler) HandleTasks(w http.ResponseWriter, r *http.Request) {
 
 	// Render template
 	data := struct {
-		Atoms []models.Atom
+		Atoms  []models.Atom
+		Boards []models.Board
 	}{
-		Atoms: atoms,
+		Atoms:  atoms,
+		Boards: boards,
 	}
 
 	if err := h.templates.ExecuteTemplate(w, "tasks-tab", data); err != nil {