feat(html): add aria-disabled helper

Co-Authored-By: Virgil <virgil@lethean.io>

docs/architecture.md

@@ -46,6 +46,7 @@ Accessibility-oriented helpers are also provided for common attribute patterns:
 - `Class(node, classes...)`
 - `AriaHidden(node, hidden)`
 - `AriaExpanded(node, expanded)`
+- `AriaDisabled(node, disabled)`
 - `TabIndex(node, index)`
 - `AutoFocus(node)`
 

docs/index.md

@@ -39,7 +39,7 @@ This builds a Header-Content-Footer layout with semantic HTML elements (`<header
 
 | Path | Purpose |
 |------|---------|
-| `node.go` | `Node` interface and all node types: `El`, `Text`, `Raw`, `If`, `Unless`, `Each`, `EachSeq`, `Switch`, `Entitled` |
+| `node.go` | `Node` interface and all node types: `El`, `Text`, `Raw`, `If`, `Unless`, `Each`, `EachSeq`, `Switch`, `Entitled`, plus `AriaLabel`, `AltText`, `AriaDisabled`, `TabIndex`, and `AutoFocus` helpers |
 | `layout.go` | HLCRF compositor with semantic HTML elements and ARIA roles |
 | `responsive.go` | Multi-variant breakpoint wrapper (`data-variant` containers, CSS scoping helpers) |
 | `context.go` | Rendering context: identity, locale, entitlements, i18n service |
@@ -52,7 +52,7 @@ This builds a Header-Content-Footer layout with semantic HTML elements (`<header
 
 ## Key Concepts
 
-**Node tree** -- All renderable units implement `Node`, a single-method interface: `Render(ctx *Context) string`. The library composes nodes into trees using `El()` for elements, `Text()` for translated text, and control-flow constructors (`If`, `Unless`, `Each`, `Switch`, `Entitled`), plus accessibility helpers such as `AriaLabel()`, `AriaControls()`, `AriaCurrent()`, `AriaHidden()`, and `TabIndex()`.
+**Node tree** -- All renderable units implement `Node`, a single-method interface: `Render(ctx *Context) string`. The library composes nodes into trees using `El()` for elements, `Text()` for translated text, and control-flow constructors (`If`, `Unless`, `Each`, `Switch`, `Entitled`), plus accessibility helpers such as `AriaLabel()`, `AriaControls()`, `AriaCurrent()`, `AriaHidden()`, `AriaDisabled()`, and `TabIndex()`.
 
 **HLCRF Layout** -- A five-slot compositor that maps to semantic HTML: `<header>` (H), `<aside>` (L/R), `<main>` (C), `<footer>` (F). The variant string controls which slots render: `"HLCRF"` for all five, `"HCF"` for three, `"C"` for content only. Layouts nest: placing a `Layout` inside another layout's slot produces hierarchical `data-block` paths like `L-0-C-0`.
 

node.go

@@ -263,6 +263,15 @@ func AriaExpanded(n Node, expanded bool) Node {
 	return Attr(n, "aria-expanded", "false")
 }
 
+// node.go: AriaDisabled sets the aria-disabled attribute on an element node.
+// Example: AriaDisabled(El("button"), true).
+func AriaDisabled(n Node, disabled bool) Node {
+	if disabled {
+		return Attr(n, "aria-disabled", "true")
+	}
+	return Attr(n, "aria-disabled", "false")
+}
+
 // node.go: TabIndex sets the tabindex attribute on an element node.
 // Example: TabIndex(El("button"), 0).
 func TabIndex(n Node, index int) Node {

node_test.go

@@ -386,6 +386,22 @@ func TestAriaExpandedHelper(t *testing.T) {
 	}
 }
 
+func TestAriaDisabledHelper(t *testing.T) {
+	ctx := NewContext()
+
+	disabled := AriaDisabled(El("button", Raw("menu")), true)
+	gotDisabled := disabled.Render(ctx)
+	if !strings.Contains(gotDisabled, `aria-disabled="true"`) {
+		t.Errorf("AriaDisabled(true) = %q, want aria-disabled=\"true\"", gotDisabled)
+	}
+
+	enabled := AriaDisabled(El("button", Raw("menu")), false)
+	gotEnabled := enabled.Render(ctx)
+	if !strings.Contains(gotEnabled, `aria-disabled="false"`) {
+		t.Errorf("AriaDisabled(false) = %q, want aria-disabled=\"false\"", gotEnabled)
+	}
+}
+
 func TestTabIndexHelper(t *testing.T) {
 	ctx := NewContext()
 	node := TabIndex(El("button", Raw("action")), -1)