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

main.js

@@ -914,7 +914,7 @@ var ImmersePlugin = class extends import_obsidian3.Plugin {
   // ============ Status Bar Timer ============
   createStatusBar() {
     this.statusBarEl = this.addStatusBarItem();
-    this.statusBarEl.addClass("focus-task-status-bar");
+    this.statusBarEl.addClass("immerse-status-bar");
     this.updateStatusBar();
     this.statusBarEl.addEventListener("click", () => {
       this.activateView();
@@ -929,10 +929,10 @@ var ImmersePlugin = class extends import_obsidian3.Plugin {
       const timeStr = this.formatTime(this.currentTimerSeconds);
       const icon = this.isTimerRunning ? "\u25B6" : "\u23F8";
       this.statusBarEl.setText(`\u26A1 ${icon} ${timeStr} - ${taskName}${task && task.text.length > 20 ? "..." : ""}`);
-      this.statusBarEl.addClass("focus-task-status-active");
+      this.statusBarEl.addClass("immerse-status-active");
     } else {
       this.statusBarEl.setText("\u26A1 Immerse");
-      this.statusBarEl.removeClass("focus-task-status-active");
+      this.statusBarEl.removeClass("immerse-status-active");
     }
   }
   // ============ Sounds & Celebrations ============