feat(search): implement Node Affinity for filter controls and hooks

[martinshub-tech]

this pr closes #476

Overview

Implemented the Node Affinity configuration for search filter controls. This feature allows users to route search/filter execution to specific cluster nodes (Auto, Primary, Replica, or Edge Cache) dynamically.

• State Syncing: Added nodeAffinity to the FilterState structure inside both useSearchFilters hooks (Pages Router & App Router versions).
• URL Parameter Binding: Integrated nodeAffinity state to sync with the affinity query parameter in URL, supporting state preservation across navigations.
• UI Integration: Designed a premium Node Affinity options card inside both FilterSidebar component implementations with clear descriptions for each routing mode.
• Visual Design: Added the Cpu icon from Lucide-React and clean radio inputs following the application’s design system (borders, peer-checked backgrounds, and hover micro-animations).

Files Changed / Added

Action	File	Description
Modify	src/app/hooks/useSearchFilters.ts	Added nodeAffinity support to App router search filter hook.
Modify	src/hooks/useSearchFilters.tsx	Added nodeAffinity support to Pages router search filter hook.
Modify	src/app/components/search/FilterSidebar.tsx	Added Node Affinity control panel to App router sidebar.
Modify	src/components/search/FilterSidebar.tsx	Added Node Affinity control panel to Pages router sidebar.
New	src/app/components/search/__tests__/FilterSidebar.test.tsx	Unit tests for App router sidebar Node Affinity.
New	src/components/search/__tests__/FilterSidebar.test.tsx	Unit tests for Pages router sidebar Node Affinity.

Rationale

Previously, search queries were dispatched without any node routing constraints. This resulted in redundant or sub-optimal execution targets in replica-heavy or edge-distributed environments. By adding Node Affinity to the Filter Controls, we empower users/developers to specify execution targets (such as requesting strong consistency from the Primary Cluster or low-latency from the Edge Cache), improving search quality, caching efficiency, and database load distribution.

Testing

• Unit tests verify that the FilterSidebar renders all four Node Affinity options (Auto, Primary, Replica, Edge).
• Tests confirm that changing options triggers the correct onFilterChange callback with the updated nodeAffinity payload.

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