fix: resolve type safety issues across contract, hooks, and wallet provider

[thelux134]

Summary

Fixes four type safety issues identified across the codebase.

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#678 — lib/contract.ts: null guard on RPC poll result

Added an explicit if (!pollJson.result) continue guard before accessing pollJson.result.status in the transaction polling loop. A transient missing-result RPC response previously caused a runtime throw via non-null assertion (!); now it gracefully skips the iteration and retries on the next poll cycle.

#679 — hooks/use-contract.ts: eliminate triple non-null assertion on mapped.details

Refactored showErrorToast so the truthy branch for the action property captures mapped.details into a single const details variable. All three subsequent references use details instead of repeating mapped.details!, removing the redundant non-null assertions.

#680 — hooks/use-webhooks.ts: replace object with typed WebhookPayload

Introduced an exported WebhookPayload interface:

export interface WebhookPayload {
  event: WebhookEventType | string
  timestamp: string
  data: Record<string, unknown>
}

Replaced the untyped object parameter in both deliverWithRetry (line 61) and fireEvent (line 123) with WebhookPayload, giving consumers a proper contract and enabling type-checking on webhook payloads.

#681 — components/providers/wallet-provider.tsx: replace any with proper interface types

The module-level _lobstrWcClient and _lobstrWcSession variables were typed as any. They are now typed using the WalletConnectClient and WalletConnectSession interfaces already defined earlier in the same file:

let _lobstrWcClient: WalletConnectClient | null = null;
let _lobstrWcSession: WalletConnectSession | null = null;

.gitignore improvements

• Changed tsconfig.tsbuildinfo → *.tsbuildinfo (wildcard catches all projects)
• Added dist/, .turbo/, *.local, .env, storybook-static/, .nyc_output/, junit.xml

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Closes #678
Closes #679
Closes #680
Closes #681

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