🐛 fix(symbol): emit module symbols for unit

Fix Builder::CreateSymbol to handle SymbolKind::Module (Unit) so system/workspace loading can match file stems.

lsp-server/src/language/symbol/internal/builder.cppm

@@ -232,6 +232,14 @@ namespace lsp::language::symbol
         Symbol symbol = [&]() -> Symbol {
             switch (kind)
             {
+            case protocol::SymbolKind::Module:
+            {
+                Unit unit;
+                unit.name = name;
+                unit.selection_range = location;
+                unit.range = location;
+                return Symbol(std::move(unit));
+            }
             case protocol::SymbolKind::Class:
             {
                 Class cls;