Complete internal code renaming from FocusTask to Immerse types

- Renamed FocusTask → ImmerseTask
- Renamed FocusTaskSettings → ImmerseSettings
- Renamed FocusTaskData → ImmerseData
- Updated CSS classes: focus-task-status-* → immerse-status-*
- Updated package release script zip filename
- Updated remaining README references
- Rebuilt main.js with new type names

src/view.ts

@@ -3,7 +3,7 @@ import {
 	WorkspaceLeaf,
 } from 'obsidian';
 
-import { VIEW_TYPE_IMMERSE, FocusTask } from './types';
+import { VIEW_TYPE_IMMERSE, ImmerseTask } from './types';
 import { QuickAddTaskModal, EditTaskModal } from './modals';
 import ImmersePlugin from './main';
 
@@ -324,7 +324,7 @@ export class ImmerseView extends ItemView {
 		}
 	}
 
-	renderTaskItem(container: Element, task: FocusTask) {
+	renderTaskItem(container: Element, task: ImmerseTask) {
 		const list = this.plugin.settings.lists.find(l => l.id === task.list);
 		
 		const taskEl = container.createEl('div', {