refactor on listener

[tiye]

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[Copilot]

Pull request overview

This PR refactors Respo’s event/listener architecture to use a single listener registration effect with semantic (name-based) identity, while also introducing higher-level VDOM construction helpers to reduce boilerplate across demo views and tests.

Changes:

• Unify local listener registration behind register_listener(...) and add framework-side warnings for duplicate ids / semantic drift.
• Add node_props + helper constructors (node_class, text_class, button_class, text_input, etc.) and update demo UI code to use them.
• Extend tests and docs/plan to cover the new listener semantics and registry guardrails; log warnings at runtime.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Updates docs to describe semantic listener identity, unified registration, and new helper APIs.
PLAN.md	Updates project plan/module map to reflect listener registry guardrails and new view helpers.
koka/respo/state.kk	Implements register_listener, semantic-name tracking, registry merging + warning generation utilities.
koka/respo/renderer.kk	Updates listener rendering/equality to use typed dom_event_kind.
koka/respo/core.kk	Introduces dom_event_kind, node_props, and higher-level node helper constructors.
koka/demo/todo/view.kk	Migrates todo UI rendering to new helper constructors and unified listener effect.
koka/demo/testspanel.kk	Migrates test panel rendering to new helper constructors.
koka/demo/tests/statecases.kk	Adds regression test for listener registry guards and updates imports accordingly.
koka/demo/tests/basics.kk	Updates render snapshot construction and listener slot usage for typed event kinds.
koka/demo/tests.kk	Adds the new listener registry guard test to the test suite.
koka/demo/shared.kk	Refactors shared UI helpers (panel, summary_chip) to use new constructors.
koka/demo/routebar.kk	Refactors route bar rendering to use new constructors.
koka/demo/layout.kk	Refactors layout rendering to use new constructors and keeps registry composition.
koka/demo/lab/view.kk	Migrates lab UI rendering to new helper constructors and unified listener effect.
koka/demo/effectspanel.kk	Migrates effects panel rendering to new helper constructors.
koka/app.kk	Logs listener registry warnings during boot and commit, and checks semantic drift across commits.
.gitignore	Adds blog/* to ignored paths.

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