Fix "Copy entire row as JSON" button TypeError on non-string values (#2116)

## Summary

Fixes an operator-precedence bug in the "Copy entire row as JSON" button on the Search page. The `typeof value === 'string'` guard only applied to `value.startsWith('{')` but not `value.startsWith('[')`, so when a row contained a non-string value (number, boolean, etc.) the second `startsWith` call threw:

```
TypeError: s.startsWith is not a function
```

The fix moves the `typeof` check to guard both `startsWith` calls:

```diff
- (typeof value === 'string' && value.startsWith('{')) ||
- value.startsWith('[')
+ typeof value === 'string' &&
+ (value.startsWith('{') || value.startsWith('['))
```

### How to test locally or on Vercel

1. Open any Search page with results containing non-string column values (e.g. numeric or boolean fields).
2. Hover over a row and click the "Copy entire row as JSON" button (copy icon).
3. Verify the row is copied as valid JSON to the clipboard without a console error.

### References

- Related issue: HDX-4023


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Co-authored-by: Cursor Agent <199161495+cursoragent@users.noreply.github.com>

.changeset/fix-copy-row-json-button.md

@@ -0,0 +1,5 @@
+---
+"@hyperdx/app": patch
+---
+
+fix: Fix "Copy entire row as JSON" button crashing on rows with non-string values

packages/app/src/components/DBTable/DBRowTableRowButtons.tsx

@@ -35,8 +35,8 @@ const DBRowTableRowButtons: React.FC<DBRowTableRowButtonsProps> = ({
       const parsedRow = Object.entries(cleanRow).reduce(
         (acc, [key, value]) => {
           if (
-            (typeof value === 'string' && value.startsWith('{')) ||
-            value.startsWith('[')
+            typeof value === 'string' &&
+            (value.startsWith('{') || value.startsWith('['))
           ) {
             try {
               acc[key] = JSON.parse(value);