Feature/roadmap 3.2

[hexplus]

Description

Works the roadmap feature list. An audit first found that 6 of the 8 items were already shipped (the codebase had moved past the roadmap), so this PR verifies those in place and implements the two genuine gaps that remained — released under 3.3.2.

New (the two gaps):

• Name-based action registry — registerAction(name, fn) / getAction(name), plus an action(el, "name", param) string overload, so actions can be applied/looked up by name (plugins, declarative usage) instead of importing each one. The built-ins (clickOutside, longPress, copyOnClick, autoResize, trapFocus) are auto-registered, and the registry is shared across duplicate runtime copies (globalThis first-copy-wins, matching the reactive core). — src/core/rendering/action.ts
• bindField supports <select multiple> — a change on a multiple-select now sets the bound field to the array of selected option values (via selectedOptions) instead of just the first; single selects, text inputs, and checkboxes are unchanged. — src/ui/form.ts

Verified already-shipped (no code change, confirmed in place): bindField, show() typing (show<T extends Element>), shorthand tag syntax, toast severity (.info/.success/.warning/.error), router KeepAlive (KeepAlive + KeepAliveRoute + RouterOptions.keepAlive), defineComponent docs.

Docs: CHANGELOG 3.3.2 gains an "Added" section for the two features; TODO.md roadmap section marked complete with per-item locations.

Tests: tests/action-registry.test.ts (5) and tests/select-binding.test.ts (3), written test-first. Full suite: 323 files / 3962 pass.

Known follow-up: reactive write-back of an array to a <select multiple>'s selected options (the read side is done) — noted in TODO/roadmap.

Related Issue

Closes #

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Checklist

• I have read CONTRIBUTING.md
• My code builds without errors
• I have tested my changes
• I have updated documentation if needed