Implement fact check filters

[maquchizi]

Summary

• Make the /fact-checks grid filter server-side (region/topic/language) instead of the prior placeholder client-side-on-current-page filtering, which narrowed live results to empty. Filters map to real Superdesk taxonomy — region → countries, topic → 01harm, language → swp_article_metadata.language — and are folded into the same swp_article_bool_exp where + aggregate as the existing pagination, so counts/pages stay correct (AND across dimensions, OR within one).
• Filter state lives in the URL (?region=…&topic=…&language=…&page=), so it's shareable and survives reload/back-forward. Options are editorial {code,label} maps: the normalized subject relation exposes no display name, no reverse relation, and no tenant scope, so a scoped/labeled option list can't be queried (documented in track-a-tasks.md).
• mapStory now populates region/topic/language labels from the jsonb, and TaxonomyRow renders only present dimensions (no more "Topic · Region · Language" placeholder leak on live cards).
• UX fixes: removing a chip re-queries immediately (not just on Apply); the filter bar reserves the chip row's height so adding a filter no longer shifts the page; an out-of-range ?page= clamps to the last valid page instead of showing a false "no matches"; dropdowns close on any click outside their options.

Test plan

• Load /fact-checks → full grid, no filters applied.
• Apply Topic = Political → grid narrows, URL shows ?topic=polit_harm, count/pagination reflect the filtered total.
• Combine Region + Topic → results AND-narrow; reload the filtered URL → state restored.
• Remove a chip → list and URL update immediately, other filters preserved; Clear → full grid.
• Visit ?topic=…&page=99 → shows last valid page, not an empty "no matches".
• Open a dropdown, click elsewhere in the bar/page → it closes; click an option → stays open.
• pnpm test, tsc, biome clean (70 tests; new coverage for buildFactCheckWhere, URL helpers, and mapStory taxonomy).

Closes #30

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Project	Deployment	Actions	Updated (UTC)
pesacheck-ui	Ready	Preview, Comment	Jun 26, 2026 2:14pm