feat(analyzer): phase 7 — share-via-email

sendAnalysisShareEmail() reuses the existing nodemailer SMTP transport
(same path as magic-link/invitation mail). Share route persists the
audit row first, then attempts send; on failure returns
{share, emailSent:false, emailError} at HTTP 200 so the audit log
stays intact. Modal surfaces send failures as a warning toast.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

components/analyzer/share-modal.tsx

@@ -39,11 +39,22 @@ export function ShareModal({ analysisId }: ShareModalProps) {
           note: note.trim() || undefined,
         }),
       });
+      const data = (await res.json().catch(() => ({}))) as {
+        error?: string;
+        message?: string;
+        emailSent?: boolean;
+        emailError?: string | null;
+      };
       if (!res.ok) {
-        const data = (await res.json().catch(() => ({}))) as { error?: string; message?: string };
         throw new Error(data.message ?? data.error ?? `Request failed: ${res.status}`);
       }
-      toast.success(`Shared with ${recipientEmail}`);
+      if (data.emailSent === false) {
+        toast.warning(
+          `Share recorded for ${recipientEmail}, but email failed: ${data.emailError ?? 'unknown error'}`
+        );
+      } else {
+        toast.success(`Shared with ${recipientEmail}`);
+      }
       setOpen(false);
       setRecipientEmail('');
       setNote('');