fix: resolve infinite re-render loops, context provider errors, and u…

[devmocrea]

This PR resolves critical runtime crashes, infinite navigation/rendering loops, and test failures in the frontend:

Infinite Render Loop ("Maximum update depth exceeded"): Refactored how components consume Zustand stores to prevent rendering loops triggered by object-returning selectors.
Landing Page Navigation Loop: Resolved an issue where query parameter discrepancies caused infinite redirects when query params were present on the root route.
Missing Context Providers: Added missing theme and WebSocket providers at the React root to prevent context initialization crashes.
Vitest Failures: Fixed accessibility selectors in loader skeletons and updated query assertions to align with current UI designs.
Key Changes

1. Zustand Selector Optimizations & Re-render Loop Fixes
   frontend/src/stores/index.ts (useTheme): Refactored the hook to select primitive fields (resolvedMode, toggleMode, etc.) individually instead of returning a new object on every selector run.
   frontend/src/pages/Dashboard.tsx & frontend/src/components/dashboard/AssetDiscoverySection.tsx: Replaced the compound selectInsightsTray selector. The components now select the required properties/actions (insightsTrayOpen, insightsTraySymbol, closeInsightsTray, and openInsightsTray) individually.
   frontend/src/hooks/useWebSocketEnhanced.ts:
   Wrapped the selectActiveChannels array selector in useShallow to prevent unnecessary component updates.
   Refactored action selection to retrieve methods individually via useShallow, preventing components utilizing this hook from re-rendering on every incoming WebSocket message.
2. Router & TimeRange Synchronization Loop Fix
   frontend/src/hooks/useTimeRange.tsx: Introduced a semantic query parameter comparison helper (searchParamsEqual) to check whether the incoming and next query strings match. This prevents infinite replacement loops caused by different parameter encodings (e.g. how lists are encoded in the URL).
3. Accessible skeletons & Vitest Fixes
   frontend/src/components/timeline/RecentActivityTimeline.tsx: Converted skeleton loader wrapper containers from div to article and added aria-busy="true" so they expose the correct accessibility roles expected by the testing suite.
   frontend/src/components/timeline/RecentActivityTimeline.test.tsx: Updated placeholder search assertions from "Search events..." to "Search activity", and removed the obsolete collapsible filters toggle test.
4. Root Provider Wrap
   frontend/src/main.tsx: Wrapped the component in both and to ensure context values are correctly resolved on first load.

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