feat: more components support TypeScript generics

[metonym]

Related #2316, #2315, #2271, #1954

This enhances several components to support TypeScript generics, providing an improved developer experience. This is especially useful for cases where objects are passed as props and may be passed back to the consumer.

The implementation follows the existing pattern used in ComboBox, DataTable, and SelectableTileGroup, allowing consumers to specify custom types while maintaining full backward compatibility through default type parameters.

Changes should be backwards-compatible.

Changes

• TreeView: add generic Node type parameter extending TreeNode.
• RecursiveList: add generic Node type parameter extending RecursiveListNode. Typedef uses RecursiveListNode[] to avoid DOM Node conflicts.
• HeaderSearch: add generic Result type parameter extending HeaderSearchResult.
• Select: add generic Value type parameter extending string | number.

---

Custom type for TreeView nodes

<script lang="ts">
  type FileNode = {
    id: string;
    text: string;
    fileSize?: number;
    nodes?: FileNode[];
  };
  
  const nodes: FileNode[] = [
    { id: "1", text: "Documents", nodes: [
      { id: "2", text: "file.txt", fileSize: 1024 }
    ]}
  ];
</script>
<TreeView {nodes} on:select={(e) => {
  // e.detail is FileNode & { expanded, leaf, selected }
}} />

Enum for Select

<script lang="ts">
  type Status = "pending" | "approved" | "rejected";
  let selected: Status | undefined;
</script>

<Select bind:selected on:update={(e) => {
  // e.detail is Status (not just string | number)
}} />

[metonym]

Released in v0.94.0