docs: mark mobile-pages-overhaul tasks complete and sync specs

openspec/specs/mobile-navigation/spec.md

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+## ADDED Requirements
+
+### Requirement: Bottom navigation grouping
+The mobile bottom navigation SHALL support grouping related pages under a single navigation item that opens a sub-menu.
+
+#### Scenario: Tools group navigation
+- **WHEN** user views the mobile bottom navigation
+- **THEN** a "Tools" item is visible that groups Tool Workshop and Config Profiles
+
+#### Scenario: Opening grouped menu
+- **WHEN** user taps a grouped navigation item
+- **THEN** a bottom sheet or menu opens showing the grouped pages
+
+#### Scenario: Active state for grouped items
+- **WHEN** user is on a page within a group
+- **THEN** the group's navigation item shows as active