diff --git a/docs/agents/task-logs/weekly/_completed.md b/docs/agents/task-logs/weekly/_completed.md
new file mode 100644
index 00000000..8f08c1f2
--- /dev/null
+++ b/docs/agents/task-logs/weekly/_completed.md
@@ -0,0 +1,19 @@
+# Weekly Agent Task Log: 2025-02-21 (Jules)
+
+**Agent:** ui-ux-marketing-expert
+**Status:** Completed
+
+## Execution Summary
+
+1.  **Scheduler Setup:**
+    *   Skipped `nostr-lock.mjs` as the script was missing from the environment.
+    *   Created log directory.
+
+2.  **UI/UX Expert Task:**
+    *   **Audit:** Audited `js/ui/profileModalController.js` and `views/` for hardcoded styles. No significant violations found (clean use of utility classes).
+    *   **Remediation:** Identified `alert()` calls in `js/ui/components/UploadModal.js` as a UX violation (blocking UI). Replaced all instances with `this.showError()` or `this.showSuccess()` to align with the design system.
+    *   **Documentation:** Updated `docs/design-system.md` to explicitly forbid `alert()`/`confirm()` and recommend non-blocking alternatives.
+
+3.  **Verification:**
+    *   Ran `tests/ui/uploadModal-integration.test.mjs`: Passed.
+    *   Ran `npm run lint`: Passed.
diff --git a/docs/design-system.md b/docs/design-system.md
index 7761c42e..67ec243e 100644
--- a/docs/design-system.md
+++ b/docs/design-system.md
@@ -181,6 +181,12 @@ Mix in Tailwind utilities for icon spacing (`gap-3`), sizing (`px-lg`, `py-sm`),
 
 `.badge` renders an inline pill (`bg-panel`, uppercase text). Opt into semantic variants with `data-variant="info"`, `data-variant="critical"`, or `data-variant="neutral"`. Layer on utilities for icon alignment or truncation.
 
+### Interaction Guidelines
+
+- **No blocking alerts:** Do not use `window.alert()` or `window.confirm()`. These native modals block the main thread and disrupt the user experience.
+- **Preferred pattern:** Use the `showError(message)` and `showSuccess(message)` callbacks provided to controllers, or render inline `.notification-banner` elements for persistent feedback.
+- **Complex confirmations:** For destructive actions requiring confirmation, use a dedicated modal or a two-step button state (e.g., "Click to confirm") rather than a native confirm dialog.
+
 ### Messaging & Notification Tokens
 
 Use the dedicated messaging tokens when styling chat surfaces and banners so they inherit theme-safe contrast and icon colors:
diff --git a/js/ui/components/UploadModal.js b/js/ui/components/UploadModal.js
index 905d78bb..52bc1cc4 100644
--- a/js/ui/components/UploadModal.js
+++ b/js/ui/components/UploadModal.js
@@ -477,12 +477,12 @@ export class UploadModal {
       if (!file) return;
 
       if (!this.storageConfigured) {
-          alert("Please configure storage before selecting a file.");
+          this.showError("Please configure storage before selecting a file.");
           e.target.value = ""; // Clear selection
           return;
       }
       if (!this.isStorageUnlocked) {
-          alert("Please unlock storage before selecting a file.");
+          this.showError("Please unlock storage before selecting a file.");
           e.target.value = "";
           return;
       }
@@ -696,7 +696,7 @@ export class UploadModal {
           if (this.results.magnet) this.results.magnet.value = "Upload Failed";
           if (this.results.torrentUrl) this.results.torrentUrl.value = "Upload Failed";
 
-          alert(`Upload failed: ${err.message}`);
+          this.showError(`Upload failed: ${err.message}`);
 
           this.inputs.file.value = ""; // Reset
       }
@@ -798,7 +798,7 @@ export class UploadModal {
           userLogger.error("Thumbnail upload failed:", err);
           this.thumbnailUploadState.status = 'error';
           this.updateThumbnailProgress(null, "Failed.");
-          alert("Thumbnail upload failed.");
+          this.showError("Thumbnail upload failed.");
       }
   }
 
@@ -934,7 +934,7 @@ export class UploadModal {
         ? signer.canSign()
         : typeof signer?.signEvent === "function";
       if (!canSign) {
-          alert("No signer available to unlock storage.");
+          this.showError("No signer available to unlock storage.");
           return;
       }
 
@@ -942,7 +942,7 @@ export class UploadModal {
           if (signer?.type === "extension") {
               const permissionResult = await requestDefaultExtensionPermissions();
               if (!permissionResult?.ok) {
-                  alert("Extension permissions are required to unlock storage.");
+                  this.showError("Extension permissions are required to unlock storage.");
                   return;
               }
           }
@@ -956,7 +956,7 @@ export class UploadModal {
           await this.loadFromStorage();
       } catch (err) {
           userLogger.error("Unlock failed", err);
-          alert("Failed to unlock storage: " + err.message);
+          this.showError("Failed to unlock storage: " + err.message);
       } finally {
           if (this.toggles.storageUnlock) {
             this.toggles.storageUnlock.textContent = "Unlock";
@@ -1012,17 +1012,17 @@ export class UploadModal {
       // Check upload state
       if (this.activeSource === "upload") {
           if (this.videoUploadState.status === 'uploading' || this.thumbnailUploadState.status === 'uploading') {
-              alert("Please wait for uploads to complete.");
+              this.showError("Please wait for uploads to complete.");
               return;
           }
           if (this.videoUploadState.status === 'error') {
-              alert("Video upload failed. Please try again.");
+              this.showError("Video upload failed. Please try again.");
               return;
           }
           if (this.videoUploadState.status !== 'complete') {
                // Fallback: If no file selected, maybe they want to submit without a new file?
                // (Not supported in this simplified modal, assume file required)
-               alert("Please select a video file and wait for it to upload.");
+               this.showError("Please select a video file and wait for it to upload.");
                return;
           }
       }