added bfs traversal #52
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This pull request introduces the Breadth-First Search (BFS) Visualizer.
Following the project plan for this feature, this PR adds:
src/algorithms/graph/bfs.js: The core algorithm logic that generates step-by-step states for the visualization, including queue, visited set, and log messages.
src/components/graph/BFSVisualizer.jsx: The main React component that handles rendering the graph (using SVG), managing the visualization state, and displaying the queue and discovery order panels.
src/pages/graph/BFS.jsx: The page component that hosts the visualizer.
Users can now create a directed graph, select a start node, and watch a step-by-step animation of the BFS algorithm, observing the FIFO nature of the queue and the level-by-level traversal.