Fix kwcall handling: resolve via SSA callee, add :plotly registration

Core.kwcall appears as SSA callee in unoptimized IR, not GlobalRef.
Added detection in SSA resolver. Also register :plotly name alongside :plot.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Dale-Black

src/compiler/codegen.jl

@@ -779,6 +779,35 @@ function compile_call(ctx::JSCompilationContext, expr::Expr)
             fn_name = string(nameof(resolved_fn))
             call_args = [compile_value(ctx, a) for a in args[2:end]]
 
+            # Handle Core.kwcall — keyword argument function calls
+            if resolved_fn === Core.kwcall && length(args) >= 3
+                kwargs_ssa = args[2]
+                func_ssa = args[3]
+                pos_raw = args[4:end]
+
+                func_type = nothing
+                if func_ssa isa Core.SSAValue
+                    func_type = ctx.code_info.ssavaluetypes[func_ssa.id]
+                end
+
+                if func_type isa Core.Const
+                    fn = func_type.val
+                    fn_mod = parentmodule(fn)
+                    fn_sym = nameof(fn)
+                    compiler_fn = lookup_package_compilation(fn_mod, fn_sym)
+                    if compiler_fn !== nothing
+                        kwargs = _extract_kwargs(ctx, kwargs_ssa)
+                        pos_args_kw = [compile_value(ctx, a) for a in pos_raw]
+                        return compiler_fn(ctx, kwargs, pos_args_kw)
+                    end
+                end
+
+                # Fallback for unregistered kwcall
+                func_js = compile_value(ctx, func_ssa)
+                pos_compiled = [compile_value(ctx, a) for a in pos_raw]
+                return "$(func_js)($(join(pos_compiled, ", ")))"
+            end
+
             # Check package registry for positional calls
             if resolved_fn isa Function
                 fn_mod = parentmodule(resolved_fn)

src/compiler/packages_plotly.jl

@@ -73,4 +73,7 @@ function register_plotly_compilations!(mod::Module)
     if isdefined(mod, :plot)
         register_package_compilation!(_plotly_plot_compiler, mod, :plot)
     end
+    if isdefined(mod, :plotly)
+        register_package_compilation!(_plotly_plot_compiler, mod, :plotly)
+    end
 end