feat(ui): use branded placeholders for images and profile avatars

[CowboyGH]

🚀 Summary

Implemented branded image fallbacks across the app UI.

The branch replaces the generic icon-based image fallback with the new placeholder assets for remote raster images, and adds a profile-local avatar image widget so user avatars use their own dedicated placeholder artwork without expanding the shared image widget API. This updates the profile user section and edit-profile preview while keeping the solution localized and consistent with the new design assets.

Summary by CodeRabbit

• New Features

  • Added dedicated avatar image component with improved loading and error handling.
  • Implemented consistent placeholder images across the app.

• Improvements

  • Enhanced image error handling with automatic icon fallback if assets fail to load.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 52a43cb1-d3e1-412d-a2f4-50d249491ad8

📥 Commits

Reviewing files that changed from the base of the PR and between a1151c4 and 6e18f7b.

⛔ Files ignored due to path filters (2)

• assets/images/avatar_placeholder.png is excluded by !**/*.png
• assets/images/image_placeholder.png is excluded by !**/*.png

📒 Files selected for processing (5)

• lib/core/constants/app_assets.dart
• lib/features/profile/presentation/widgets/edit_profile_dialog.dart
• lib/features/profile/presentation/widgets/profile_avatar_image.dart
• lib/features/profile/presentation/widgets/user_section_widget.dart
• lib/uikit/images/network_image_widget.dart

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📝 Walkthrough

Walkthrough

This change introduces two new asset path constants (imagePlaceholder and avatarPlaceholder) and consolidates image placeholder handling across the profile feature. A new ProfileAvatarImage widget is added to replace NetworkImageWidget usage in profile-related screens. The NetworkImageWidget is updated to use asset-based placeholders instead of icon-based ones. The refactoring unifies placeholder rendering behavior across image loading components.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A rabbit hops through flutter code,
New placeholders light the road! ✨
ProfileAvatarImage takes its place,
Cache and assets interlace,
Icons fallback, images align—
Network widgets now refine! 🎨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: replacing generic icon-based placeholders with branded image and avatar placeholders across the UI, which is reflected in all modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/app-image-placeholders

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