## Summary
- **Restores `convertViewFilterValueToString()` calls** that were lost
when the converter layer was removed in #18667. The GraphQL
`ViewFilter.value` is typed as `JSON` (can be a string, array, or
object), but the frontend type system expects a `string`. Without
stringification, SELECT/MULTI_SELECT filter values (e.g. `['LOST']`)
reach `arrayOfStringsOrVariablesSchema` as raw arrays, causing a
`ZodError: expected string, received array`.
- **Fixes applied at two data boundary points**: `splitViewWithRelated`
(primary entry from metadata store) and `mapViewFiltersToFilters` (which
also accepts `GqlViewFilter[]` directly).
Fixes a production regression introduced by #18667.
## Test plan
- [ ] Apply a SELECT filter (e.g. filter Opportunities by Stage =
"Lost") — should no longer throw ZodError
- [ ] Apply a MULTI_SELECT filter — should work correctly
- [ ] Verify filters with multiple selected values work (e.g. Stage is
"Lost" or "Won")
- [ ] Verify empty filters and "is not" operands still work
- [ ] Verify filters loaded from saved views still work after page
refresh
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