feat(ui): upgrade structural components, extract password preview controls, and modernize branding

[dhruvanbhalara]

Description

This Pull Request delivers a comprehensive, premium design system upgrade and branding overhaul for PassVault Enterprise, successfully completing Phase 2 of the UI refactoring roadmap. All changes have been developed under strict Clean Architecture standards, adhering to functional rules, and fully aligning with quality and security guidelines.

🎨 What Changed?

1. Brand Identity & Cross-Platform Icons

• Complete Asset Redesign: Updated app branding icons across all platforms (Android launcher mipmaps, iOS development/production asset sets, macOS/native icon files, Windows application ICO, and Web launcher favicons/maskable images).
• Visual Premium Feel: Uses high-fidelity, high-contrast, modern geometric shield and vault key designs with smooth gradients.

2. Design System Component Overhaul & Cleanup

• Core Components Overhauled: Completely modernized and polished AppButton, AppTextField, AppCard, AppLoader, AppErrorPage, and AppFeatureShell using curated HSL tailored color schemes, sleek dark gradients, and micro-interactions.
• Obsolete Code Deletion: To prevent clutter and tech debt, dropped several deprecated or unused design components along with their test files:
  • app_fab_rotate.dart / app_pressable_scale.dart
  • app_text_button.dart (and app_text_button_test.dart)
  • app_filter_chips.dart (and app_filter_chips_test.dart)
  • app_icon_badge.dart (and app_icon_badge_test.dart)
  • app_list_option.dart (and app_list_option_test.dart)
  • app_shimmer_loading.dart (and app_shimmer_loading_test.dart)
  • strategy_option_tile.dart

3. Password Preview Card Extraction & Integration

• Unified Interactive Widget: Extracted and consolidated duplicate layouts into a single, high-fidelity PasswordPreviewCard component (located in lib/core/design_system/components/common/password_preview_card.dart).
• Feature Integration: Placed across Password Generator, Active Strategy Editor, and Strategy Preview screens, dramatically reducing layout duplication.
• 100% Test Mirroring: Added fully comprehensive unit and widget tests for the new component (test/core/design_system/components/common/password_preview_card_test.dart).

4. UI Polish & Layout Hardening

• Glassmorphism Standardized: Preserved and standardized Glassmorphism styling and backdrop-filters where it adds visual excellence.
• Header Constraints Standardized: Unified PageHeader wrapping padding and layout boundaries to prevent UI overflows.

5. Quality Assurance & Test Hardening

• Hit-Test Resolution: Resolved a layout-clipping hit-test warning in intro_screen_test.dart / onboarding_robot.dart by updating the test robot to hit-test the interactive GestureDetector descendant directly rather than the outer RenderProxyBox wrapping.

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🧪 Verification & Quality Gate Status

All code passes the project's strict quality gates before review request:

• Automated Tests: 100% passing rate (430 tests passed successfully)
• Static Analysis: 0 issues / warnings from flutter analyze
• Formatting: Formatted cleanly using dart format .
• Layers: Maintained perfect boundary isolation (Domain is pure Dart, Zero-Logic UI).

📊 Code Coverage Report

Metric	Value
Total Lines	5212
Lines Hit	4232
Overall Coverage	81.20%

Generated by PassVault CI