[Fred-Wu]

Summary

Boolean-column filters currently apply immediately when a choice is selected. This can trigger accidental data fetching before the user finishes choosing a filter, particularly for large datasets.

This change:

• Adds anApply button alongside Reset so users explicitly apply their selection.
• Adds a Blank choice to filter NA values in boolean columns such as c(TRUE, FALSE, NA).

Validation: all 13 data-viewer unit tests, TypeScript checks, and lint pass. New tests cover filter options, button configuration, and True/False predicates excluding missing values. Browser interaction has not been tested.

[renkun-ken]

Reviewed commit 18b4f5e780611c10c8d4a7a96975ac562654c60d. No actionable issues found.

I exercised the shared viewer script with AG Grid 36.2.0 in headless Chrome, using both the client-side row model and an infinite-row datasource harness backed by fixtures from this commit's sess implementation:

• Selecting or changing True/False/Blank leaves the applied filter and displayed rows unchanged until Apply; the infinite datasource receives no extra request while editing the selection.
• Applying True and False excludes missing values. Blank selects only the missing rows, and its generated filter model is accepted by the R backend.
• Reset restores all rows; toggling floating filters and restoring saved viewer state preserve the applied boolean filter.

Validation passed: all 13 data-viewer unit tests, TypeScript compilation, lint, and 195 R data-viewer assertions using the exact prepared dist/resources/sess installed in a temporary library. Direct backend checks on c(TRUE, FALSE, NA, TRUE, FALSE, NA) also passed for all three operators. Current macOS, Ubuntu, Windows, build, and lint CI checks are green.

[eitsupi]

Formatting error should be fixed #1891.