refactor row search and filter

[raylrui]

changes

• New search box on each table: matches rows whose value in a chosen text column contains the typed text (case-insensitive), debounced while typing, immediate on Enter. Column defaults to libraryId where present.
• The old always-open filter panel is now an Advanced filter button (closed by default) showing the active condition count; search and filter combine with AND.
• Search state (q, qcol) lives in the URL alongside the existing filter, so views stay shareable.
• Depends on the mart API allowing the includesInsensitive filter operator (see companion orcahouse PR below) — the box hides itself if the API doesn't offer it yet.
• README split into focused docs. Root README trimmed to intro, quick start, commands, and key facts.

[Copilot]

Copilot review overview

🔵 Needs a closer look

The changes span search behavior, filtering, URL state, UI integration, and documentation, warranting final human review.

Review effort: Lite
Findings: None

What changed in this PR

Refactors table browsing with URL-shareable, debounced row search, collapsible advanced filters, and reorganized documentation.

Changes:

• Adds case-insensitive search with column selection and API-aware behavior.
• Combines search and advanced filters with AND semantics.
• Splits project documentation into focused guides.

File	Description
src/​lib/​schema.ts	Registers the search operator.
src/​lib/​row-search.ts	Provides search-field and clause helpers.
src/​lib/​filters.ts	Combines filter inputs.
src/​components/​TableBrowser.tsx	Integrates search and advanced filters.
src/​components/​RowSearch.tsx	Implements the debounced search UI.
README.md	Provides a concise project overview.
docs/​local-development.md	Documents local setup.
docs/​how-it-works.md	Documents runtime and search behavior.
docs/​development-guide.md	Documents development conventions.
docs/​deployment.md	Documents deployment and API dependencies.

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