[Refactor] Complete GetX Migration — Remove All Remaining `setState` and `GetBuilder` Usage

[inderjeet20]

Summary

Several files in the codebase still use Flutter's native setState / StatefulBuilder for local UI state, and one instance of GetBuilder remains in the app. These are inconsistent with the project's GetX-first architecture already established in HomeController, DetailRouteController, etc.

Problem

File	Issue
tags_widget.dart	TagsRoute is a StatefulWidget with 3 setState calls — no corresponding GetX controller exists
date_picker_input.dart	3 setState calls managing currentIndex and _selectedDates list
profile_view.dart	StatefulBuilder wrapping dialog content with 2 setState calls for selectedMode
manage_task_server_page_body.dart	1 setState inside modal + 1 GetBuilder<ManageTaskServerController>
add_task_bottom_sheet_new.dart	4 orphaned homeController.update() calls — NOPs since no GetBuilder listens
tasks_builder.dart	Calls private storageWidget._refreshTasks() — brittle and bypasses the public API

Expected Behavior

All UI state should be managed via .obs reactive variables and Obx widgets, consistent with the existing GetX architecture. No setState, StatefulBuilder, or orphaned update() calls should remain in the app code.

Steps to Reproduce

Run grep -r "setState" lib/app/ — returns active hits in the files above.

Labels

refactor getx state-management good first issue

[inderjeet20]

@Pavel401 , @SGI-CAPP-AT2 please review it.