fix(habit): use boolean values for daily habit completion tracking

- Change daily habit completion from numeric (0/1) to boolean (true/false) for simple habits
- Keep numeric value (1) only for habits with completionText to indicate match
- Update type definitions to support boolean | string | number | null
- Fix completion checking to use strict equality (=== true) instead of truthy values

src/components/features/habit/habitcard/dailyhabitcard.ts

@@ -60,8 +60,8 @@ export class DailyHabitCard extends HabitCard {
 			// If completionText is defined, check if value is 1 (meaning it matched completionText)
 			isCompletedToday = todayValue === 1;
 		} else {
-			// Default behavior: any truthy value means completed
-			isCompletedToday = !!todayValue;
+			// Default behavior: check for boolean true
+			isCompletedToday = todayValue === true;
 		}
 
 		checkbox.checked = isCompletedToday;
@@ -85,8 +85,8 @@ export class DailyHabitCard extends HabitCard {
 				if (this.habit.completionText) {
 					return value === 1;
 				}
-				// Default behavior: any truthy value means completed
-				return value > 0;
+				// Default behavior: check for boolean true
+				return value === true;
 			}
 		);
 	}

src/components/features/habit/habitcard/habitcard.ts

@@ -193,10 +193,10 @@ export class HabitCard extends Component {
 			case "daily":
 				const dailyHabit = habitToUpdate as DailyHabitProps;
 				if (dailyHabit.completionText) {
-					newCompletionValue = currentCompletionToday === 1 ? 0 : 1;
+					newCompletionValue = currentCompletionToday === 1 ? null : 1;
 				} else {
-					// Default behavior: toggle between 0 and 1
-					newCompletionValue = currentCompletionToday ? 0 : 1;
+					// Default behavior: toggle between true and false
+					newCompletionValue = currentCompletionToday ? false : true;
 				}
 				break;
 			case "count":

src/types/habit-card.d.ts

@@ -50,7 +50,7 @@ export type BaseHabitData =
 
 // DailyHabitProps
 export interface DailyHabitProps extends BaseDailyHabitData {
-	completions: Record<string, string | number>; // String is date, string or number is completion value
+	completions: Record<string, boolean | string | number | null>; // Date -> boolean (for simple check), number (for completionText), null (for unchecked)
 }
 
 // CountHabitProps