fix: implement missing $getAllAccountDids method in PlatformServiceMixin

- Add $getAllAccountDids() implementation to resolve TypeError in ProjectsView
- Method queries accounts table and returns array of DIDs
- Includes proper error handling and logging
- Fixes "this.$getAllAccountDids is not a function" console error on /projects route

The method was declared in TypeScript interfaces but never implemented,
causing runtime errors when ProjectsView tried to initialize user identities.

src/utils/PlatformServiceMixin.ts

@@ -1498,6 +1498,31 @@ export const PlatformServiceMixin = {
       }
     },
 
+    /**
+     * Get all account DIDs - $getAllAccountDids()
+     * Retrieves all account DIDs from the accounts table
+     * @returns Promise<string[]> Array of account DIDs
+     */
+    async $getAllAccountDids(): Promise<string[]> {
+      try {
+        const result = await this.$dbQuery(
+          "SELECT did FROM accounts ORDER BY did",
+        );
+
+        if (!result?.values?.length) {
+          return [];
+        }
+
+        return result.values.map((row: SqlValue[]) => row[0] as string);
+      } catch (error) {
+        logger.error(
+          "[PlatformServiceMixin] Error getting all account DIDs:",
+          error,
+        );
+        return [];
+      }
+    },
+
     // =================================================
     // TEMP TABLE METHODS (for temporary storage)
     // =================================================