Show results from providers that don't support active content filters
(date/person) in a separate "Additional results" section with a note
explaining that some filters may have been ignored.
Changes:
- Add computed properties to separate filtered/unfiltered results
- Track filter compatibility using baseProvider for searchFrom providers
- Deduplicate results by resourceUrl across sections
- Skip in-folder results when at root to avoid duplicating Files results
- Fix providerIsCompatibleWithFilters to check correct filter properties
- Add styling for the unfiltered results section
Signed-off-by: nfebe <fenn25.fn@gmail.com>