refactor: move FlowPilot actions to header bar, fix dividers

- Moved Resolve/Escalate/Share Update buttons from fixed bottom bar into
  the session header. Desktop: inline buttons + overflow menu (Pause/Close).
  Mobile: single overflow menu with all actions.
- Removed FlowPilotActionBar from bottom — message input is now the only
  fixed element at bottom, giving more breathing room.
- Replaced jarring white dividers (var(--glass-border)) with subtle
  border-border (#2e3240) throughout FlowPilot session.
- Restyled status badge from button-looking element to dot + text indicator
  with semantic colors (green=resolved, amber=escalated).
- Reduced content padding from pb-32 to pb-24.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/flowpilot/FlowPilotMessageBar.tsx

@@ -178,7 +178,7 @@ export function FlowPilotMessageBar({ onRespond, disabled = false, isProcessing
 
   return (
     <div
-      className="fixed bottom-[52px] sm:bottom-[56px] right-0 lg:right-72 z-40 px-3 sm:px-6 lg:px-8 pb-2"
+      className="fixed bottom-0 right-0 lg:right-72 z-40 px-3 sm:px-6 lg:px-8 pb-3"
       style={{ left: 'var(--sidebar-w, 0px)' }}
       onDragOver={handleDragOver}
       onDragEnter={handleDragEnter}