fix: generate UUID fallback for missing x-request-id header in edge functions

[Copilot]

Fixed "no-id" static fallback for x-request-id in french-chat and reflection edge functions, which collapsed all header-less requests into the same log identifier, making traces unattributable.

Changes

• requestId fallback — replaced ?? "no-id" with ?? crypto.randomUUID() in both functions, matching the pattern already used in french-feedback
• Scope fix — moved requestId declaration outside the try block so catch handlers use the same unique ID rather than a stale hardcoded [no-id]

// Before
try {
  const requestId = req.headers.get("x-request-id") ?? "no-id";
  ...
} catch (error) {
  console.error(`[no-id] Error in french-chat function:`, error); // always "no-id"
}

// After
const requestId = req.headers.get("x-request-id") ?? crypto.randomUUID();
try {
  ...
} catch (error) {
  console.error(`[${requestId}] Error in french-chat function:`, error); // unique per request
}

Affected functions: french-chat, reflection.

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