FEAT GUI: Add prompt table and seed detail view

Start with the dataset components and APIs from items 2–3, then compare the existing History table and pagination patterns plus shared TypeScript types and API error handling. Trace the card-to-table navigation and frontend test entry points; done means the listed navigation, inspection, copy, error, accessibility, routing, and component-test acceptance criteria work without live datasets.

Is your feature request related to a problem? Please describe.

Dataset cards need a drill-down where users can inspect actual examples and select a seed without copying it through notebooks. Long prompts and linked multimedia must remain understandable without loading the whole dataset.

Work item 4 of 17 in #2744. Technical prerequisites: items 2-3. Keep not ready yet until promoted in the parent sequence.

Describe the solution you'd like

Connect dataset cards to a paginated table backed by the seed browsing API. Show compact text previews, modality and seed-type labels, harm categories, and selection state. Expand an example to show complete text, linked pieces, roles/order, stable IDs, and available metadata such as source, authors, license, and dates.

Include prompt-text search and the supported facets, clear filters, a return-to-catalog action, and copy-full-text/copy-ID utilities. Preserve the user's filters, page, and inspected example when navigating back. Show missing metadata as missing, without making up a license or classifying unlabeled content as safe.

Use single-example selection for the initial chat workflow. Add a clear extension point for later multi-select, but do not concatenate independent examples. Treat dataset content as untrusted text: do not execute HTML, templates, embedded instructions, or simulated-conversation configuration while previewing it.

Acceptance criteria:

• Card-to-table navigation, pagination, filters, expansion, and browser navigation work.
• A linked example remains intact and full text is available beyond the truncated preview.
• Copy actions preserve exact prompt content and report failures clearly.
• Unsupported seed shapes remain inspectable and are clearly distinguished from directly importable prompts.
• Loading, no matches, missing dataset/example, and API errors have usable states.
• Keyboard selection, focus restoration, long-content layout, and component/routing tests are included.

Describe alternatives you've considered, if relevant

Do not edit/delete seeds, fetch remote metadata, add batch sending, or render media independently here. Item 5 adds shared media previews; item 7 adds chat import actions; item 15 adds multi-select for scenarios.

Additional context

Use the dataset components and APIs from earlier items, the existing History table/pagination patterns, and shared TypeScript types/API error handling. Follow the frontend style/test instructions. No credentials or live remote datasets should be needed for development.