fix: improve type safety and fix Playwright test dialog handling

**Type Safety Improvements:**
- Replace `unknown[]` with proper `SqlValue[]` type in database query methods
- Add `SqlValue` import to PlatformServiceMixin.ts for better type definitions
- Update interface definitions for `$dbGetOneRow` and `$one` methods
- Fix database row mapping to use `Array<SqlValue>` instead of `unknown[]`

**Test Reliability Fix:**
- Add backup seed modal handling to 60-new-activity.spec.ts
- Follow established dialog handling pattern from 00-noid-tests.spec.ts
- Use `waitForFunction` to detect backup seed modal appearance
- Gracefully handle modal dismissal with "No, Remind me Later" button
- Add error handling for cases where backup modal doesn't appear

**Files Changed:**
- src/utils/PlatformServiceMixin.ts: Enhanced type safety for database operations
- test-playwright/60-new-activity.spec.ts: Fixed dialog interception causing test failures

**Impact:**
- Eliminates TypeScript linting errors for database query types
- Resolves Playwright test timeout caused by backup seed modal blocking clicks
- Improves test reliability by following established dialog handling patterns
- Maintains backward compatibility while enhancing type safety

**Testing:**
- TypeScript compilation passes without errors
- Linting checks pass with improved type definitions
- Playwright test now handles backup seed modal properly

test-playwright/60-new-activity.spec.ts

@@ -71,6 +71,22 @@ test('New offers for another user', async ({ page }) => {
   await page.locator('div[role="alert"] button > svg.fa-xmark').click(); // dismiss info alert
   await expect(page.locator('div[role="alert"] button > svg.fa-xmark')).toBeHidden(); // ensure alert is gone
 
+  // Handle backup seed modal if it appears (following 00-noid-tests.spec.ts pattern)
+  try {
+    // Wait for backup seed modal to appear
+    await page.waitForFunction(() => {
+      const alert = document.querySelector('div[role="alert"]');
+      return alert && alert.textContent?.includes('Backup Your Identifier Seed');
+    }, { timeout: 3000 });
+    
+    // Dismiss backup seed modal
+    await page.getByRole('button', { name: 'No, Remind me Later' }).click();
+    await expect(page.locator('div[role="alert"]').filter({ hasText: 'Backup Your Identifier Seed' })).toBeHidden();
+  } catch (error) {
+    // Backup modal might not appear, that's okay
+    console.log('Backup seed modal did not appear, continuing...');
+  }
+
   // make another offer to user 1
   const randomString2 = Math.random().toString(36).substring(2, 5);
   await page.getByTestId('offerButton').click();