Pane command rows go flat, like the Connections button

The file panels' action verbs (Send/Edit/Rename/new folder/new file/
permissions/Delete) and the panel picker were wearing the full Aero slab,
which is the dialog push-button treatment — wrong for what is really an
Explorer command bar. Marked the session strip w7-toolbar so they get the
flat-with-hover-glow treatment the Connections button already had from the
tab-bar row.

The path bar gets it too. Its up/refresh controls sit directly under the
action row, so leaving them as slabs beside newly-flat neighbours would have
read as arbitrary rather than deliberate. w7-toolbar only targets button, so
the path <input> keeps its 7.css textbox border.

Verified on a live single-instance capture: both rows flat, the path input
unchanged. architecture.md's "three header rows" was now wrong and says
"every command row" instead.

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

docs/architecture.md

@@ -306,8 +306,11 @@ still scales and 7.css's `pt` shorthand stops resetting weight/line-height.
 
 **Markup hooks**: `role="progressbar"` (+aria) on the transfer bars,
 `has-scrollbar` on scroll containers (7.css only styles `::-webkit-scrollbar`
-under that class), `w7-toolbar` on the three header rows (their buttons go
-flat — Explorer's command bar was flat, unlike dialog push buttons), `w7-flat`
+under that class), `w7-toolbar` on every command row — the three window header
+rows plus each file panel's session strip and path bar (their buttons go flat
+with a hover glow — Explorer's command bar was flat, unlike dialog push
+buttons; it only targets `button`, so the path `<input>` keeps its 7.css
+textbox treatment), `w7-flat`
 as the per-button escape hatch for the same treatment outside a toolbar (the
 status-bar transfers summary is a text toggle, not a push button), `w7-btn`
 on the 10 dialog action buttons. The flat treatment is split across two