HelmetDataContext.helmet was typed as HelmetServerState (non-nullable) while setHelmet accepted HelmetServerState | null and used a non-null assertion (serverState!) to paper over the mismatch — leaving context.helmet silently null at runtime despite the type claiming otherwise.

Changes

• src/HelmetData.ts: Widen HelmetDataContext.helmet to HelmetServerState | null; remove the ! assertion in setHelmet
• src/Provider.tsx: Update public context.helmet prop type to HelmetServerState | null to match

// Before
interface HelmetDataContext {
  helmet: HelmetServerState; // ← lie: can actually be null at runtime
}
setHelmet: (serverState: HelmetServerState | null) => {
  this.context.helmet = serverState!; // ← suppresses the type error
}

// After
interface HelmetDataContext {
  helmet: HelmetServerState | null; // ← honest
}
setHelmet: (serverState: HelmetServerState | null) => {
  this.context.helmet = serverState; // ← no assertion needed
}

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