feat(applications): tables, members and stats on the overview

[rubenvdlinde]

Rebuild of #42 (originally #28) on the page model of nextcloud#3100, see #13. Stacked on #54.

What changes

The application overview now shows which tables the application works on, who it is shared with, and a short summary.

• Tables: every table the application uses, through its own nodes, the start page's tables and views, a data widget on one of its pages, or a menu entry that opens a table or view. Each row shows the row count, the number of views and what uses the table: the page title, the menu entry label, or "Application" for a node nothing else uses. A table the user cannot access is listed by id.
• Members (owner only): the owner and everyone the application is shared with, with a button to change the shares. Only the owner gets the full list of shares, so others don't see this section.
• Stats: a line counting the pages and tables, plus the members for the owner.
• Page filter: a filter field appears once an application has more than six pages, matching title, type and what the page shows.

Carried over from #42, and what changed because of nextcloud#3100

• Members, stats, the filter and the table list are carried over.
• "Tables used" reads data widgets from tables_contexts_widget_source (widget.source.nodeRelId, loaded per page from the page API by feat(applications): overview page to manage pages and menu #53) next to the start page's page_content rows; feat(applications): tables, members and stats on the overview #42 read every page's content rows as widgets. A widget whose table left the application has no source and adds nothing.

Tests

Nextcloud 34 container (PostgreSQL 16), Playwright at 1600 x 1000, --timeout=120000:

• application.spec.ts: new "The overview lists the tables the application uses, its members and its counts" (2 pages, 2 tables, 1 member; the menu's table row names the menu entry, a table shown only by a data widget on a grid page names that page) and "An application with many pages gets a filter for them" (8 pages, the filter leaves 1). Whole file: 13 passed (1.3m).
• npm run lint: 0 errors, 1 inherited warning (src/store/store.js:176); npm run stylelint: clean; npm run build: OK.

Prepared in the Conduction fork for porting upstream by @remko48. Prepared with Claude Code.