feat(typescript): resolve Priority 2 type safety issues across components

- Eliminate all remaining any types in Priority 2 components (activity, gifts, usage limits, QR scanning, discovery, meetings)
- Implement proper TypeScript types using existing interfaces (GiveActionClaim, EndorserRateLimits, ImageRateLimits)
- Replace any types with unknown + proper type guards for error handling
- Fix type assertions for external library integrations (QR scanning, mapping)
- Maintain backward compatibility while improving type safety

Resolves 7 Priority 2 type safety warnings, achieving 100% type safety for critical user-facing functionality.

src/views/ImportAccountView.vue

@@ -221,10 +221,11 @@ export default class ImportAccountView extends Vue {
 
       this.notify.success("Account imported successfully!", TIMEOUTS.STANDARD);
       this.$router.push({ name: "account" });
-    } catch (error: any) {
+    } catch (error: unknown) {
       this.$logError("Import failed: " + error);
       this.notify.error(
-        error.message || "Failed to import account.",
+        (error instanceof Error ? error.message : String(error)) ||
+          "Failed to import account.",
         TIMEOUTS.LONG,
       );
     }