feat(ui): replace alert() with showError() in UploadModal and update design system guidelines

Co-authored-by: PR0M3TH3AN <[email protected]>

docs/agents/task-logs/weekly/_completed.md

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+# 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.