feat(types): add explicit TypeScript types across the codebase

[tomadowley]

This change introduces comprehensive typing throughout the project to improve type safety and maintainability. Key updates include:

• Python engine.py: added explicit types for constants and function signature (GREETING: str, SIGNOFF: str, greet(name: str) -> str).
• React app: App component is now typed as React.FC; minor structural typing improvements to App.tsx.
• Sorting utilities (TypeScript): added concrete types across all sorting algorithms:
  • bubbleSort, insertionSort, selectionSort, mergeSort, quickSort, heapSort, randomSort now use explicit types for numbers, generics (T), and arrays (T[], number[], etc).
  • Added precise type annotations for loop indices, keys, and helper variables (e.g., n: number, minIdx: number, key: T, left: T[], right: T[]).
• Prime checker (PrimeChecker.tsx): introduced a ResultState type alias (boolean | null) and wired state hooks with explicit types (input: string, checked: boolean, isPrimeResult: ResultState). Ensures consistent state handling for tri-state result.
• index.tsx: added robust container typing and a runtime check for the root container before creating the React root, improving runtime safety.
• Additional modules (insertionSort.ts, mergeSort.ts, primeGenerator.ts, randomSort.ts, reportWebVitals.ts, selectionSort.ts): added precise type annotations to parameters, return types, and internal variables (e.g., mid: number, left: number[], right: number[], isPrime checks, etc.).

These changes collectively enforce stronger type safety and help catch type-related issues earlier during development.

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This pull request was co-created with Cosine Genie

Original Task: sorbox/hic0pyrmko3s
Author: Tom Dowley

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Project	Deployment	Review	Updated (UTC)
sorbox	Ready	Preview, Comment	Jan 27, 2026 1:19pm