[Dashboard] Fix url params for fn overload (#4324)

## Problem solved

Short description of the bug fixed or feature added

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## PR-Codex overview
This PR exposes `toFunctionSelector` and updates its usage in the dashboard component for better navigation.

### Detailed summary
- Exposed `toFunctionSelector` in `thirdweb/utils.ts`
- Updated `ContractFunctionsPanel` to use `toFunctionSelector` for navigation based on function selector
- Improved function selection logic in `FunctionsOrEventsListItem` to use `toFunctionSelector`

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packages/thirdweb/src/exports/utils.ts

@@ -181,3 +181,5 @@ export { parseAbiParams } from "../utils/contract/parse-abi-params.js";
 // bigint
 // ------------------------------------------------
 export { max, min } from "../utils/bigint.js";
+
+export { toFunctionSelector } from "viem";