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/DiscoverView.vue

@@ -458,7 +458,9 @@ export default class DiscoverView extends Vue {
     if (this.isLocalActive) {
       await this.searchLocal();
     } else if (this.isMappedActive) {
-      const mapRef = this.$refs.projectMap as any;
+      const mapRef = this.$refs.projectMap as {
+        leafletObject: L.Map;
+      };
       this.requestTiles(mapRef.leafletObject); // not ideal because I found this from experimentation, not documentation
     } else {
       await this.searchAll();
@@ -518,11 +520,11 @@ export default class DiscoverView extends Vue {
           throw JSON.stringify(results);
         }
       }
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    } catch (e: any) {
+    } catch (e: unknown) {
       logger.error("Error with search all: " + errorStringForLog(e));
       this.notify.error(
-        e.userMessage || NOTIFY_DISCOVER_SEARCH_ERROR.message,
+        (e as { userMessage?: string })?.userMessage ||
+          NOTIFY_DISCOVER_SEARCH_ERROR.message,
         TIMEOUTS.LONG,
       );
     } finally {