Add C# language support

[DataDave-Dev]

🇪🇸 Español

Agregar soporte para C# generando un call graph (funciones/métodos como nodos, llamadas como aristas), siguiendo la arquitectura pluggable.

Por qué encaja

• El grammar ya viene incluido: node_modules/tree-sitter-wasms/out/tree-sitter-c_sharp.wasm — solo hay que copiarlo a public/wasm/ (no hay que compilar nada).
• C# es un call-graph clásico con clases/métodos/herencia, así que encaja en el patrón LangSpec + analyzeProjectWith (como los analyzers de JavaScript/TypeScript).

Tareas

• Copiar tree-sitter-c_sharp.wasm a public/wasm/.
• Crear src/lib/analysis/analyzers/csharp.ts con un LangSpec: definiciones de métodos/funciones locales, clases (class_declaration), llamadas (invocation_expression), extends/interfaces (lista de bases) y using para imports.
• Registrarlo en registry.ts y cablear EXT/PROJECT_EXTS (.cs), selector + sample en CodeWorkspace, y los chips de Hero/Features.
• Tests en analyzers.test.ts (call graph entre archivos, clases/herencia, grafo vacío).
• Actualizar docs (Languages.tsx) y README (en/es).

Punto de partida: mirar los analyzers existentes typescript.ts/javascript.ts (tienen clases) y el PR de Rust (#77) como referencia del cableado.

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🇬🇧 English

Add C# support, generating a call graph (functions/methods as nodes, calls as edges), following the pluggable architecture.

Why it fits

• The grammar is already bundled: node_modules/tree-sitter-wasms/out/tree-sitter-c_sharp.wasm — just copy it to public/wasm/ (no build needed).
• C# is a classic call graph with classes/methods/inheritance, so it fits the LangSpec + analyzeProjectWith pattern (like the JavaScript/TypeScript analyzers).

Tasks

• Copy tree-sitter-c_sharp.wasm into public/wasm/.
• Create src/lib/analysis/analyzers/csharp.ts with a LangSpec: method/local-function defs, classes (class_declaration), calls (invocation_expression), extends/interfaces (base list), and using for imports.
• Register it in registry.ts and wire EXT/PROJECT_EXTS (.cs), the selector + sample in CodeWorkspace, and the Hero/Features chips.
• Tests in analyzers.test.ts (cross-file call graph, classes/inheritance, empty graph).
• Update docs (Languages.tsx) and README (en/es).

Starting point: look at the existing typescript.ts/javascript.ts analyzers (they have classes) and the Rust PR (#77) for the wiring reference.