ix: resolve wiki breadcrumb crashes and browser redirect loop #346

[shivani11jadhav]

📝 Description

This PR addresses and completely resolves #346 by refactoring the local state architecture of the Wiki/Roadmap deep sub-pages into a modern, query-driven routing system. This fixes the client-side route crashes, state desynchronization, and the infinite back-navigation redirect loops.

🛠️ Changes Made

• Decoupled Local State: Replaced the local useState hook for activeArticle inside src/app/wiki/page.tsx with Next.js App Router's dynamic hooks (useSearchParams and useRouter).
• Unified Query Parameter System: Wired the sidebar and node selection to trigger a shallow history push via router.push('/wiki?article=id', { scroll: false }). This registers genuine browser history snapshots, fixing back-navigation gracefully.
• Robust Nullish Defenses: Embedded double-nullish coalescing operators (??) across all breadcrumb extraction nodes and header text layouts to secure the interface from rendering crashes if invalid strings are queried.
• Performance Optimization: Wrapped the primary search params consumers inside a React <Suspense> boundary to fulfill the Next.js static asset build criteria smoothly.

🧪 Verification & Testing

• Validated via local TypeScript check (npx tsc --noEmit).
• Confirmed that deep-linking directly via URL (e.g., /wiki?article=setup) successfully loads the targeted article content on mounting.
• Verified that pressing the browser's native Back/Forward buttons smoothly steps through the visited wiki articles rather than dropping or blocking the router stack.

GSSoC '26 Contributor. Please review and merge this patch! 🙌