fix: preserve original error in requestSessionResult

Wrapping the caught error with new Error(e) coerced it to the string
"[object Object]" and discarded the original stack trace. Log the
failure with context and rethrow the original error instead.

Fixes #28

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: dobby-coder[bot]

server/src/services/IrmaService.ts

@@ -72,9 +72,9 @@ export default class {
             }
 
             return result;
-        } catch (e: any) {
-            // TODO: Fix error handling
-            throw new Error(e);
+        } catch (e) {
+            Logger.error('IrmaService.requestSessionResult failed for session %s: %o', token, e);
+            throw e;
         }
     };
 }