feat: add launch penalty input to creator dashboard settings tab

[Moh-dakai]

Adds a Launch Penalty section to the creator dashboard settings tab so creators can configure the early-sell penalty
fee via the set_launch_penalty contract call.

Changes

• Course interface — added launchPenaltyBps?: number field (basis points, 0–2000)
• useSetLaunchPenaltyMutation — new mutation hook that calls set_launch_penalty, invalidates the creator detail query
  on success, and shows a success toast
• LaunchPenaltyPanel — new form component with a 0–20% number input pre-filled from launchPenaltyBps, inline
  validation, helper text ("Applied to sells within the first 7 days after key creation"), and a submit button; input
  re-syncs with the fetched value after a successful save so the updated penalty is reflected without a page reload
• CreatorDashboardPage — wires LaunchPenaltyPanel into the settings tab as a new card section below Auction Setup

Acceptance criteria met

• ✅ Current penalty value pre-filled on mount (converts bps → percentage for display)
• ✅ Input constrained to 0–20% with validation messages
• ✅ Helper text shown below the input
• ✅ Success toast shown after contract confirmation
• ✅ Updated penalty reflected in the input without a page reload (useEffect syncs on launchPenaltyBps change)

Testing

• pnpm lint — passes
• tsc -b — passes (vite build blocked by a pre-existing @tailwindcss/oxide native binding issue in the dev
  environment, unrelated to this change)

closes #830

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