React adapter: update useCalendar for kernel + module API

[bart-krakowski]

Parent

#25

What to build

Update `@tanstack/react-time`'s `useCalendar` hook to consume the new kernel + module API. The hook remains a thin reactive binding — no domain logic lives here. It instantiates the kernel, subscribes to the store via `@tanstack/react-store`, and exposes reactive selectors so components re-render only when the data they consume changes.

Acceptance criteria

• `useCalendar({ modules, strategy, events, resources })` instantiates a kernel and returns its full API reactively
• Components subscribed to `days` re-render when the projection changes; components subscribed only to `viewMode` do not re-render on unrelated event changes
• `strategy: 'client' | 'server'` is accepted and forwarded to the kernel
• The hook re-exports all Calendar product actions (`addEvent`, `editEvent`, `removeEvent`, `navigate`, `undo`, `redo`, etc.) as stable references
• `getEventProps(event)` and `getUnavailableRanges(date)` are accessible from the hook return value
• The Solid adapter (`@tanstack/solid-time`) mirrors the hook shape using Solid's reactive primitives, confirming the core is framework-agnostic
• All existing `@tanstack/react-time` tests are updated and passing

Blocked by

#29
#30
#31
#32
#33
#34