perf(input): stripReasoningContent calls JSON.stringify on the entire input array just to check field existence

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Problem

apps/desktop/src/main/gateway/bridge/input.ts L236–246

export function stripReasoningContent(input: unknown): unknown {
  if (!Array.isArray(input)) return input;
  const str = JSON.stringify(input);                       // ← serializes entire conversation history
  if (!str.includes('reasoning_content')) return input;   // only checks for field existence
  return input.map((item) => { ... });
}

The conversation history can contain dozens of message turns and large blocks of code or tool output, yet this code serializes the whole array just to perform a substring check for a field name.

Suggested fix

if (!Array.isArray(input) || !input.some(
  (item) => item && typeof item === 'object' && 'reasoning_content' in item
)) return input;

Eliminates JSON.stringify entirely; direct property access short-circuits as soon as a match is found.