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

[rubenvdlinde]

Rebuild of #28 on application pages (nextcloud#3075, see #13). Stacked on #41.

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, 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 no page or menu entry 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 #28, and what changed because of pages

• Members, stats, the filter and the table list are carried over.
• "Tables used" no longer reads grid views' widget targets: it derives usage from the application's nodes, the content of its pages (each content row's node_rel_id) and its menu targets, as asked in feat(views): allow views without a table #13. The page count is the number of pages, not of menu items.

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" (1 page, 1 table, 1 member, the table row names the menu entry that opens it) and "An application with many pages gets a filter for them" (8 pages, the filter leaves 1). Whole file: 12 passed (one run hit the 120 s limit on the filter test because the locator missed the input; fixed, then 2 passed for the two new tests).
• npm run lint: 0 errors (1 inherited warning in store.js), npm run stylelint clean, npm run build OK.

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