feat: add subscription status toggle component

[MerlinTheWhiz]

Closes #37

Changes made:

• src/components/ui/switch.tsx (new): Reusable accessible toggle switch using role="switch" + aria-checked. Follows shadcn/ui conventions: accepts checked, onCheckedChange, disabled, className, id, aria-label. Styled with bg-primary when on, bg-input when off, with the knob animating via translate-x.
• src/components/subscription/subscription-plan-card.tsx (updated) — Added:
  • "use client" directive (needed for useState)
  • defaultAcceptingNewSubscribers prop (defaults to true)
  • Local acceptingNewSubscribers state managed by useState
  • "Accepting New Subscribers" label with the Switch toggle in the card's footer area, below the active subscribers count

How it works:

The SubscriptionPlanCard now renders a toggle labeled "Accepting New Subscribers" that switches between true/false locally via useState. The Switch component is decoupled and reusable anywhere in the app.

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