feat: remove Todoist integration entirely

Native tasks (native_tasks table) fully replace Todoist. All Todoist
API code, store functions, handlers, routes, templates, and tests have
been removed. Migration 021 drops the now-unused tasks cache table.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

5 files changed, 6 insertions, 90 deletions

diff --git a/internal/models/atom.go b/internal/models/atom.go
index 967b489..9f40de6 100644
--- a/internal/models/atom.go
+++ b/internal/models/atom.go
@@ -10,7 +10,6 @@ type AtomSource string
 
 const (
 	SourceTrello      AtomSource = "trello"
-	SourceTodoist     AtomSource = "todoist"
 	SourceMeal        AtomSource = "plantoeat"
 	SourceGTasks      AtomSource = "gtasks"
 	SourceClaudomator AtomSource = "claudomator"
@@ -74,35 +73,6 @@ func (a *Atom) ComputeUIFields() {
 	a.HasSetTime = dueInTZ.Hour() != 0 || dueInTZ.Minute() != 0
 }
 
-// TaskToAtom converts a Todoist Task to an Atom
-func TaskToAtom(t Task) Atom {
-	// Todoist priority: 1 (normal) to 4 (urgent)
-	// Keep as-is since it already matches our 1-4 scale
-	priority := t.Priority
-	if priority < 1 {
-		priority = 1
-	}
-	if priority > 4 {
-		priority = 4
-	}
-
-	return Atom{
-		ID:          t.ID,
-		Title:       t.Content,
-		Description: t.Description,
-		Source:      SourceTodoist,
-		Type:        TypeTask,
-		URL:         t.URL,
-		DueDate:     t.DueDate,
-		CreatedAt:   t.CreatedAt,
-		Priority:    priority,
-		SourceIcon:  "🔴", // Red circle for Todoist
-		ColorClass:  "border-red-500",
-		IsRecurring: t.IsRecurring,
-		Raw:         t,
-	}
-}
-
 // NativeTaskToAtom converts a native doot Task to an Atom.
 func NativeTaskToAtom(t Task) Atom {
 	priority := t.Priority
diff --git a/internal/models/atom_test.go b/internal/models/atom_test.go
index 53bf343..6f86949 100644
--- a/internal/models/atom_test.go
+++ b/internal/models/atom_test.go
@@ -5,60 +5,6 @@ import (
 	"time"
 )
 
-func TestTaskToAtom(t *testing.T) {
-	now := time.Now()
-	task := Task{
-		ID:          "task-123",
-		Content:     "Test task",
-		Description: "Task description",
-		DueDate:     &now,
-		Priority:    3,
-		URL:         "https://todoist.com/task/123",
-		CreatedAt:   now,
-		IsRecurring: true,
-	}
-
-	atom := TaskToAtom(task)
-
-	if atom.ID != "task-123" {
-		t.Errorf("Expected ID 'task-123', got '%s'", atom.ID)
-	}
-	if atom.Title != "Test task" {
-		t.Errorf("Expected title 'Test task', got '%s'", atom.Title)
-	}
-	if atom.Source != SourceTodoist {
-		t.Errorf("Expected source Todoist, got '%s'", atom.Source)
-	}
-	if atom.Type != TypeTask {
-		t.Errorf("Expected type Task, got '%s'", atom.Type)
-	}
-	if atom.Priority != 3 {
-		t.Errorf("Expected priority 3, got %d", atom.Priority)
-	}
-	if atom.SourceIcon != "🔴" {
-		t.Error("Expected red circle icon")
-	}
-	if !atom.IsRecurring {
-		t.Error("Expected IsRecurring to be true")
-	}
-}
-
-func TestTaskToAtom_PriorityClamping(t *testing.T) {
-	// Test priority below 1
-	lowTask := Task{Priority: 0}
-	lowAtom := TaskToAtom(lowTask)
-	if lowAtom.Priority != 1 {
-		t.Errorf("Priority should be clamped to 1, got %d", lowAtom.Priority)
-	}
-
-	// Test priority above 4
-	highTask := Task{Priority: 10}
-	highAtom := TaskToAtom(highTask)
-	if highAtom.Priority != 4 {
-		t.Errorf("Priority should be clamped to 4, got %d", highAtom.Priority)
-	}
-}
-
 func TestCardToAtom(t *testing.T) {
 	now := time.Now()
 	card := Card{
diff --git a/internal/models/timeline.go b/internal/models/timeline.go
index c4196bd..ab486a8 100644
--- a/internal/models/timeline.go
+++ b/internal/models/timeline.go
@@ -39,7 +39,7 @@ type TimelineItem struct {
 	IsOverdue   bool       `json:"is_overdue"`
 	IsAllDay    bool       `json:"is_all_day"` // True if time is midnight (no specific time)
 	DaySection  DaySection `json:"day_section"`
-	Source      string     `json:"source"` // "todoist", "trello", "plantoeat", "calendar", "gtasks"
+	Source      string     `json:"source"` // "trello", "plantoeat", "calendar", "gtasks"
 
 	// Source-specific metadata
 	ListID string `json:"list_id,omitempty"` // For Google Tasks
diff --git a/internal/models/types.go b/internal/models/types.go
index 0b025ce..d9dd515 100644
--- a/internal/models/types.go
+++ b/internal/models/types.go
@@ -6,7 +6,7 @@ import (
 	"time"
 )
 
-// Task represents a task from Todoist
+// Task represents a native task
 type Task struct {
 	ID          string     `json:"id"`
 	Content     string     `json:"content"`
@@ -118,7 +118,7 @@ type Card struct {
 	URL       string     `json:"url"`
 }
 
-// Project represents a Todoist project
+// Project represents a project (used for source config grouping)
 type Project struct {
 	ID   string `json:"id"`
 	Name string `json:"name"`
@@ -249,7 +249,7 @@ type CompletedTask struct {
 // SourceConfig represents a configurable item from a data source
 type SourceConfig struct {
 	ID        int64  `json:"id"`
-	Source    string `json:"source"`     // trello, todoist, gcal, gtasks
+	Source    string `json:"source"`     // trello, gcal, gtasks
 	ItemType  string `json:"item_type"`  // board, project, calendar, tasklist
 	ItemID    string `json:"item_id"`
 	ItemName  string `json:"item_name"`
diff --git a/internal/models/widget.go b/internal/models/widget.go
index 94deec7..8d0bdd6 100644
--- a/internal/models/widget.go
+++ b/internal/models/widget.go
@@ -3,7 +3,7 @@ package models
 import "time"
 
 // WidgetItem is a single item in the widget API response.
-// Source values: "todoist", "trello", "plantoeat", "calendar", "gtasks"
+// Source values: "doot", "trello", "plantoeat", "calendar", "gtasks"
 // Type values:   "task", "event"
 type WidgetItem struct {
 	ID          string     `json:"id"`
@@ -14,7 +14,7 @@ type WidgetItem struct {
 	End         *time.Time `json:"end,omitempty"`
 	IsAllDay    bool       `json:"is_all_day"`
 	URL         string     `json:"url,omitempty"`
-	Completable bool       `json:"completable"` // true = todoist task (checkbox shown)
+	Completable bool       `json:"completable"` // true = doot task (checkbox shown)
 }
 
 // WidgetResponse is the full /api/widget response body.