[Docs] Align navigation manual with palette and Workbench catalogs

[Chris0Jeky]

Problem

The user manual overstates two navigation catalogs:

1. Ctrl+K is described as a complete finder for every route, but the command palette omits routes such as export/import and the automation queue.
2. Workbench mode is described as making Access and Archive visible, while both remain commandOnly in the shipped navigation catalog.

Bounded outcome

Choose and document one truthful contract for each mismatch: either extend the catalogs with direct tests, or narrow the manual wording to the routes each catalog actually exposes. Keep this issue to navigation discoverability; do not redesign the shell.

Acceptance checks

• Manual claims match the route, command-palette, and Workbench visibility catalogs.
• Direct frontend tests cover any catalog behavior change.
• Docs governance and changed-link checks pass.

Provenance

Combines two same-seam non-blocking MEDIUM findings from the second and final review round on PR #1560.

[Chris0Jeky]

Parked pending #1589. A fresh source review confirmed that the unpushed docs draft would describe the Legacy sidebar as universal even though the default Paper shell exposes Home plus a Workbench group. It also overstates feature-flag behavior: Workbench can surface catalog entries whose routes still redirect when disabled. No PR will be opened from the draft; the branch is preserved locally for inspection.