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/modals.ts

@@ -5,7 +5,7 @@ import {
 	Setting,
 } from 'obsidian';
 
-import { FocusTask } from './types';
+import { ImmerseTask } from './types';
 import ImmersePlugin from './main';
 
 // ============ Quick Add Task Modal ============
@@ -113,9 +113,9 @@ export class QuickAddTaskModal extends Modal {
 
 export class EditTaskModal extends Modal {
 	plugin: ImmersePlugin;
-	task: FocusTask;
+	task: ImmerseTask;
 
-	constructor(app: App, plugin: ImmersePlugin, task: FocusTask) {
+	constructor(app: App, plugin: ImmersePlugin, task: ImmerseTask) {
 		super(app);
 		this.plugin = plugin;
 		this.task = { ...task };