refactor: enforce strict linting rules, replace forEach with for...of loops, and remove console logging throughout the frontend.

frontend/src/pages/Activate.tsx

@@ -28,8 +28,7 @@ export default function Activate() {
         });
         await publicApi.get(url);
         setStatus("success");
-      } catch (err) {
-        console.error("Activation error:", err);
+      } catch (_err) {
         setStatus("error");
       }
     };

frontend/src/pages/Editor.tsx

@@ -79,8 +79,7 @@ export default function Editor() {
         requestAnimationFrame(() => {
           canvasRef.current?.loadData(canvasData);
         });
-      } catch (err) {
-        console.error("Failed to load existing letter:", err);
+      } catch (_err) {
       } finally {
         setIsInitialLoading(false);
       }
@@ -158,8 +157,7 @@ export default function Editor() {
       }
 
       setTimeout(() => setIsSaveSuccess(false), 5000);
-    } catch (error) {
-      console.error("Save failed:", error);
+    } catch (_error) {
     } finally {
       setIsSealing(false);
     }
@@ -169,9 +167,7 @@ export default function Editor() {
     if (!shareLink) return;
     try {
       await navigator.clipboard.writeText(shareLink);
-    } catch (err) {
-      console.error("Failed to copy:", err);
-    }
+    } catch (_err) {}
   };
 
   return (

frontend/src/pages/Login.tsx

@@ -46,7 +46,6 @@ export default function Login() {
 
       navigate(ROUTES.DRAWER);
     } catch (err) {
-      console.error("Login error:", err);
       let message =
         "Sorry, we're experiencing technical issues.\nPlease try again later.";
       if (axios.isAxiosError(err) && err.response?.status !== 500) {

frontend/src/pages/Reader.tsx

@@ -52,7 +52,6 @@ export default function Reader() {
         setCanvasData(json);
         setIsDecrypting(false);
       } catch (err: any) {
-        console.error("Reader Error:", err);
         setError(`Failed to load letter: ${err.message || "Unknown error"}`);
         setIsDecrypting(false);
       }

frontend/src/pages/Register.tsx

@@ -50,7 +50,6 @@ export default function Register() {
       });
       navigate(ROUTES.VERIFY_EMAIL);
     } catch (err) {
-      console.error("Registration error:", err);
       let message = "Registration failed. Please try again.";
       if (axios.isAxiosError(err)) {
         message = err.response?.data?.message || message;