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>

ui/src/app/file-panel/file-panel.html

@@ -1,5 +1,9 @@
-<!-- session strip -->
-<div class="relative flex items-center gap-1.5 border-b border-border px-2 py-1">
+<!-- session strip.
+     w7-toolbar: these are Explorer command-bar verbs, not dialog push buttons,
+     so under the win7 skin they go flat with a hover glow instead of wearing
+     the full Aero slab — the same treatment the Connections button gets from
+     the tab-bar row. -->
+<div class="w7-toolbar relative flex items-center gap-1.5 border-b border-border px-2 py-1">
   <button
     (click)="toggleMenu()"
     class="flex min-w-0 items-center gap-1.5 rounded-md px-2 py-1 text-(length:--path-font) font-medium hover:bg-accent"
@@ -157,8 +161,10 @@
   }
 </div>
 
-<!-- path bar -->
-<div class="flex items-center gap-1 border-b border-border px-2 py-1.5">
+<!-- path bar. Also w7-toolbar: the up/refresh controls sit next to the action
+     row, so leaving them as Aero slabs would read as arbitrary. The class only
+     targets buttons — the path <input> keeps its 7.css textbox treatment. -->
+<div class="w7-toolbar flex items-center gap-1 border-b border-border px-2 py-1.5">
   <button
     (click)="panel().up()"
     [disabled]="blocked()"