prefix based matching to query filter values displayed using dropdown

[dakshshahani]

• new component ui/combobox.tsx added – reusable free-text input + anchored dropdown, consists prefix narrowing functionality
• categorical column metadata collected – columns subcategorized as categorical and multi-value columns. extractColumnValues collects distinct columns values. used with existing QueryProvider, updating column data with page refresh (activeHackathon change etc). no extra firestore reads :D
• types and integration — updated queryFilters.tsx andfilter-rows.tsx to use combobox.tsx for boolean and categorical variables. works with the existing edit-filter-in-place flow and shares the same newFilterValue state.

[github-actions]

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[geoff-jiang]

@dakshshahani Simply lovely.

side note: the 'matches' option behaves more like 'contains' since it will return all rows that pass the filter even if there are other multi-select values.
eg. The filter 'gender matches male' will return a row where gender contains 'male, unsure'.

What do you think about changing the matches label to instead be 'contains' and equals to be 'exactly equals'? Might be clearer for organizers.

[dakshshahani]

good idea, i'll add change matches → contains and equals → exactly equals