feat(timer): add comprehensive task timer functionality

- Add TaskTimer editor extension with start/stop/pause controls
- Implement TaskTimerManager for timer state management
- Add TaskTimerExporter for data export capabilities
- Create TaskTimerFormatter for time display formatting
- Add TaskTimerMetadataDetector for task metadata parsing
- Include task timer CSS styling and UI components
- Integrate timer settings into plugin configuration
- Support timer persistence and session management

Author: Quorafind

src/common/setting-definition.ts

@@ -520,6 +520,21 @@ export interface TimelineSidebarSettings {
 	quickInputShowQuickActions: boolean;
 }
 
+/** Task Timer Metadata Detection Settings */
+export interface TaskTimerMetadataDetection {
+	frontmatter: string;
+	folders: string[];
+	tags: string[];
+}
+
+/** Task Timer Settings */
+export interface TaskTimerSettings {
+	enabled: boolean;
+	metadataDetection: TaskTimerMetadataDetection;
+	timeFormat: string;
+	blockRefPrefix: string;
+}
+
 /** OnCompletion Settings */
 export interface OnCompletionSettings {
 	/** Whether onCompletion functionality is enabled */
@@ -686,6 +701,9 @@ export interface TaskProgressBarSettings {
 	// Time Parsing Settings
 	timeParsing: TimeParsingConfig;
 
+	// Task Timer Settings
+	taskTimer: TaskTimerSettings;
+
 	// Onboarding Settings
 	onboarding?: {
 		completed: boolean;
@@ -1365,6 +1383,18 @@ export const DEFAULT_SETTINGS: TaskProgressBarSettings = {
 		realTimeReplacement: true,
 	},
 
+	// Task Timer Defaults
+	taskTimer: {
+		enabled: false,
+		metadataDetection: {
+			frontmatter: "task-timer",
+			folders: [],
+			tags: ["timer", "tracked"]
+		},
+		timeFormat: "{h}hrs{m}mins",
+		blockRefPrefix: "timer"
+	},
+
 	// Onboarding Defaults
 	onboarding: {
 		completed: false,