demo-lazy

An input character counter extension — and at the same time a demo of the extension framework's lazy loading semantics:

• A useful little feature: when the input is non-empty, a compact line N 字 · ≈M tokens (CJK ≈1 token/char, others ≈4 chars/token) is shown above the input box; an empty input renders nothing
• Lazy loading v2 two-stage boilerplate (2026-09-08): clientImmediately: false — zero requests during startup; the static "Lazy" button in the top bar (declared in manifest ui.toolbar[], rendered by the host, icon same-origin) fetches the bundle only when clicked and opens the panel via meta.onClick. The chatInputTop character-count line works as usual after materialization (kept as a teaching counter-example of "a always-mounted slot makes lazy-loading moot", see the source comments)
• Dependency edge: clientDependsOn: ["demo"] demonstrates an inject edge in the startup graph (informational, only affects prefetch scheduling)