feat(typescript): implement type-safe database error handling and eliminate any types

- Add comprehensive database error interfaces (DatabaseConstraintError, DatabaseStorageError, DexieError)
- Implement type guards for database error handling (isDatabaseError, isDatabaseConstraintError, etc.)
- Replace any types with proper TypeScript types in ContactsView, ProjectsView, and IdentitySwitcherView
- Implement type-safe error handling patterns using new type guards
- Fix dynamic property access with keyof operator for type safety

Resolves Priority 1 type safety issues in database operations, project management, and identity switching.

src/views/ContactsView.vue

@@ -170,6 +170,7 @@ import { logger } from "../utils/logger";
 // No longer needed - using PlatformServiceMixin methods
 // import { PlatformServiceFactory } from "@/services/PlatformServiceFactory";
 import { PlatformServiceMixin } from "@/utils/PlatformServiceMixin";
+import { isDatabaseError } from "@/interfaces/common";
 import { createNotifyHelpers, TIMEOUTS } from "@/utils/notify";
 import { APP_SERVER } from "@/constants/app";
 import {
@@ -376,7 +377,11 @@ export default class ContactsView extends Vue {
           "",
           async (name) => {
             await this.addContact({
-              did: (registration.vc.credentialSubject.agent as any).identifier,
+              did: (
+                registration.vc.credentialSubject.agent as {
+                  identifier: string;
+                }
+              ).identifier,
               name: name,
               registered: true,
             });
@@ -387,7 +392,11 @@ export default class ContactsView extends Vue {
           async () => {
             // on cancel, will still add the contact
             await this.addContact({
-              did: (registration.vc.credentialSubject.agent as any).identifier,
+              did: (
+                registration.vc.credentialSubject.agent as {
+                  identifier: string;
+                }
+              ).identifier,
               name: "(person who invited you)",
               registered: true,
             });
@@ -396,8 +405,7 @@ export default class ContactsView extends Vue {
             this.showOnboardingInfo();
           },
         );
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      } catch (error: any) {
+      } catch (error: unknown) {
         const fullError = "Error redeeming invite: " + errorStringForLog(error);
         this.$logAndConsole(fullError, true);
         let message = "Got an error sending the invite.";
@@ -881,20 +889,21 @@ export default class ContactsView extends Vue {
   /**
    * Handle errors during contact addition
    */
-  private handleContactAddError(err: any): void {
+  private handleContactAddError(err: unknown): void {
     const fullError =
       "Error when adding contact to storage: " + errorStringForLog(err);
     this.$logAndConsole(fullError, true);
 
     let message = NOTIFY_CONTACT_IMPORT_ERROR.message;
-    if (
-      (err as any).message?.indexOf("Key already exists in the object store.") >
-      -1
-    ) {
-      message = NOTIFY_CONTACT_IMPORT_CONFLICT.message;
-    }
-    if ((err as any).name === "ConstraintError") {
-      message += " " + NOTIFY_CONTACT_IMPORT_CONSTRAINT.message;
+
+    // Use type-safe error checking with our new type guards
+    if (isDatabaseError(err)) {
+      if (err.message.includes("Key already exists in the object store")) {
+        message = NOTIFY_CONTACT_IMPORT_CONFLICT.message;
+      }
+      if (err.name === "ConstraintError") {
+        message += " " + NOTIFY_CONTACT_IMPORT_CONSTRAINT.message;
+      }
     }
 
     this.notify.error(message, TIMEOUTS.LONG);