[Feature]: Add Java code support to Sliding Window Visualizer

[tazmeen24]

Problem or limitation

• SlidingWindowVisualizer.jsx only supports executable code examples in JavaScript and Python.
• Java support is missing despite AlgoScope advertising Java, C++, Python, and JavaScript support.
• Learners using Java have no code reference for the sliding window visualizer.
• Missing Java implementation affects:
  • Max Sum of Size K
  • Longest Unique Substring
  • Smallest Subarray ≥ Target

Proposed solution

Add a java entry to the code object for all six approach configs (3 problems × brute force + sliding window), following the existing js/py pattern of { src: [...], map: {...} }. Specifically:

• Add Java source line arrays with correct map line-number references for step-highlighting (each language has its own map since line counts differ)
• Extend the tokenize() syntax highlighter with a Java-aware regex (keywords like public, static, void, int, class, new, Integer.MAX_VALUE, HashSet, etc.)
• Add 'java' to the language toggle button list (currently ['js', 'py'])
• Update the code panel filename label to show .java when Java is selected

Alternatives considered

N/A

Use case

Students working through algorithm patterns in a Java-based course or interview prep track (many DSA courses and interviews are Java-first) can follow the same step-by-step animation and see the equivalent Java code highlighted in sync, instead of having to mentally translate from the JS or Python shown.

Additional context

N/A

[tazmeen24]

@adityapaul26 @Bimbok pls assign this issue to me

[github-actions]

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_{🤖 AlgoScope Automation}