feat: keep the sidebar for groups; search in the nav, the rest in the user menuHEADmain

Search is an icon in the nav, left of the tray button and the bell, and marks
itself current on its page. Administration, Node, Create group and Android
Sync moved to the user menu, between Settings and the theme, each under the
condition it had in the sidebar. The sidebar keeps Public groups and the
groups.

On a phone, a tablet or the Android application the menu trigger is the
avatar alone (max-width 768px or a coarse pointer); the name is the dropdown's
first line, one line with an ellipsis. Measured: a 20-character handle put the
trigger 159 px off a 320 px screen with search and transfers in the nav, and a
64-character one pushed the dropdown 122 px off the left.

Creating a group is a desktop-application feature by design: a hand-typed
#/create-group no longer opens the form in a browser, and QUICKSTART step 6
now says to use the desktop application instead of the browser.

test_layout_responsive read only the first 768px media block; it reads them
all now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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