fix(clippy): replace type annotation with type alias + .insert() to avoid trivial_cast

- Use type alias ExtDispatch for the HashMap type (fixes type_complexity)
- Use .insert() instead of HashMap::from([...]) to avoid fn ptr trivial casts
- Remove all as fn(...) casts to avoid clippy::trivial_casts

apps/infrastructure/src/tools/semantic_search.rs

@@ -286,17 +286,17 @@ impl SymbolIndex {
         let walker = ignore::Walk::new(path);
 
         // Pre-compile per-extension dispatch table.
-        let ext_dispatch = HashMap::from([
+        type ExtDispatch = HashMap<&'static str, fn(&str, &str) -> Vec<CodeSymbol>>;
-            ("rs", extract_rust as fn(&str, &str) -> Vec<CodeSymbol>),
+        let mut ext_dispatch = ExtDispatch::new();
-            ("ts", extract_typescript as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("rs", extract_rust);
-            ("tsx", extract_typescript as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("ts", extract_typescript);
-            ("mts", extract_typescript as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("tsx", extract_typescript);
-            ("js", extract_javascript as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("mts", extract_typescript);
-            ("jsx", extract_javascript as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("js", extract_javascript);
-            ("mjs", extract_javascript as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("jsx", extract_javascript);
-            ("py", extract_python as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("mjs", extract_javascript);
-            ("go", extract_go as fn(&str, &str) -> Vec<CodeSymbol>),
+        ext_dispatch.insert("py", extract_python);
-        ]);
+        ext_dispatch.insert("go", extract_go);
 
         for entry in walker.flatten() {
             let file_path = entry.path();