feat(mobile): implement clean frontend-first architecture and unified…

[jpdevhub]

Overview

This PR completes the frontend scaffolding for the Agronavis mobile application. It integrates all the core UI screens and establishes a seamless, fully-routed navigation structure, bringing the application design to life as a complete, navigable prototype.

Key Changes

• Unified Navigation Architecture: Configured a robust Expo Router layout featuring a fixed 4-tab bottom navigation bar (Dashboard, My Farms, AI Scanner, and Community).
• Onboarding Flow: Implemented a complete 3-step user onboarding sequence (Profile Setup, Farm Location Mapping, and Notification Toggles).
• Core Screen Integration:
  • Added full dashboard layout with bento-grid statistics, live weather, and task tracking.
  • Implemented the "My Farms" suite, including sub-pages for Map Views, Field Status, and History.
  • Added the AI Scanner interface complete with camera UI and detailed scan result/treatment plan pages.
  • Added the Community feed and Crop Selection catalog.
• Repository Cleanup: Removed unused legacy folders, consolidated standalone UI files, and updated .gitignore to keep the repository clean of system artifacts.