fix(core): render PowerSearch field groups

[nynexman4464]

Summary

• render optional PowerSearch field sections from the existing PowerSearchField.group value
• place ungrouped fields first, then named sections in configuration order
• keep ranked non-empty search results flat
• preserve keyboard navigation across section boundaries
• add a realistic issue-tracker Storybook example with grouped fields

Stacked on #5233 so the field browser can display sections across the expanded browsing list, up to its 1,000-row safety ceiling.

Fixes #5234.

Test plan

• Added integration coverage for section order, accessible group labels, flat ranked results, and keyboard navigation across boundaries.
• Added search-source coverage for empty-query ordering and flat non-empty results.
• Verified the regression tests fail when group metadata or grouped rendering is removed.
• Ran the focused PowerSearch and Typeahead tests, core typecheck, and repository checks on the final stack.
• Manually exercised the grouped issue-tracker story with ungrouped fields followed by People, Planning, and Activity sections; sections disappear while typing.

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Project	Deployment	Actions	Updated (UTC)
astryx	Ready	Preview	Aug 20, 2026 11:34pm