[FE] Delete the old filters element and logic once the new element is fully working

[otrocadev]

🎯 Objective

Finalize the migration to the new filtering system by completely removing the deprecated start-filters.component from the codebase, including all its references, declarations, and associated stylesheet rules.

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📍 Background

The project recently underwent a migration from a legacy filtering approach to a new filtering system. While the new system has been implemented and validated, the old start-filters.component was left in the codebase as residual code.

This task addresses that technical debt by performing a targeted cleanup — ensuring no traces of the old component remain in the project structure.

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🔎 Scope of Work

The following areas are covered by this task:

• Component removal — Delete all files belonging to start-filters.component (.ts, .html, .scss, .spec.ts )
• Reference cleanup — Remove every import, usage, and invocation of the component across the project
• Module cleanup — Remove the component from any NgModule where it was declared or exported
• SCSS cleanup — Remove all stylesheet rules that were written specifically for or dependent on start-filters.component
• Validation — Verify the application builds and behaves correctly after the removal

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🚫 Out of Scope

The following are explicitly not part of this task:

• Any modification to the new filtering system logic or its components
• Refactoring of other unrelated components or modules
• Design or UX changes to the filtering functionality
• Performance optimizations beyond what the cleanup naturally provides
• Writing new tests for the new filtering system (covered in its own task)
• Migration of any remaining feature flags or configuration tied to the old filter (tracked separately)

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✅ Definition of Done

This task is considered complete when all of the following criteria are met:

• All start-filters.component files have been deleted from the repository
• No imports or references to start-filters.component remain anywhere in the codebase
• The component has been removed from all NgModule declarations and exports
• All SCSS rules exclusively related to start-filters.component have been removed
• The application compiles with no errors or warnings related to the removed component
• No visual regressions are detected in areas previously involving the old component
• The new filtering system continues to function correctly end-to-end

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⚠️ Risks & Considerations

• Shared SCSS rules — Some styles may have been reused beyond start-filters.component. Care must be taken to only remove rules that are exclusively tied to the old component, to avoid unintended visual side effects.
• Indirect references — Dynamic imports or string-based references (e.g., in routing configs or lazy-loaded modules) could be overlooked. A project-wide search is recommended before closing the task.
• Testing coverage — If any existing tests were written specifically for start-filters.component, they must also be removed or updated to avoid false failures in the test suite.

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