fix: three more bugs of the same classes (Esc fall-through, chord, placement)

Hunted the classes behind the recent quick-search fixes across the codebase:

- Esc priority: the command palette is .cmd-palette (not .modal), so the
  slideover's capture-phase Esc handler didn't see it and popped the
  discard-confirm UNDER the open palette. Capture handler now also yields
  to the palette.
- Esc fall-through: the fallback Esc branch closed palette + slideover +
  entry modal + generator ALL on one keystroke. Now closes exactly one
  surface per keystroke, topmost first.
- Modifier chord: the real-VK Tab between username and password becomes
  Shift+Tab if the user holds Shift mid-fill -> focus moves backward and
  the password lands in the username field. ForceReleaseModifiers before
  SendVKey(VK_TAB).
- Stale placement: RestoreFromTray replayed the MinimizeToTray snapshot for
  a merely taskbar-minimised window, teleporting it to the last tray-hide
  position. Snapshot now replays only on a genuine tray return (captured
  before Show flips Visible); iconic windows use Windows' own placement.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

delphi-backend/Source/PM.Bridge.pas

@@ -669,6 +669,7 @@ end;
 procedure TPMBridge.RestoreFromTray;
 var
   LFormHwnd, LAppHwnd: HWND;
+  LWasTrayHidden: Boolean;
 begin
   // Tray icon stays in the tray — we only show the window again.
   LFormHwnd := MainFormHWND(FMainForm);
@@ -684,6 +685,10 @@ begin
     Exit;
   end;
 
+  // Captured BEFORE Show flips Visible: tray-hidden (Hide'd by
+  // MinimizeToTray) vs merely taskbar-minimised (Visible but iconic).
+  LWasTrayHidden := not FMainForm.Visible;
+
   // Reverse order: show the app proxy first so the taskbar entry comes back,
   // then show and foreground the form.
   if LAppHwnd <> 0 then
@@ -697,7 +702,11 @@ begin
   // window). Unconditional SW_RESTORE would un-maximise a maximised
   // window — surprising for the user who pressed Ctrl+Shift+A / +L /
   // clicked the tray.
-  if FHasSavedPlacement then
+  // Replay the snapshot ONLY for a genuine tray return (window was hidden —
+  // the exact state MinimizeToTray created). A merely taskbar-minimised
+  // window restores via Windows' own placement memory below; replaying our
+  // older snapshot would teleport it to wherever it sat at the LAST tray-hide.
+  if FHasSavedPlacement and LWasTrayHidden then
   begin
     // showCmd governs whether the window comes back maximised or normal;
     // it's what SW_RESTORE clobbers. We force it ourselves. Captured while
@@ -1325,6 +1334,9 @@ begin
   ClearFieldIfWanted;
   SendUnicodeString(AUsername);
   Sleep(200);
+  // Real-VK send: a physically held Shift here turns Tab into Shift+Tab —
+  // focus moves BACKWARD and the password lands in the username field.
+  ForceReleaseModifiers;
   SendVKey(VK_TAB);
   Sleep(200);
   ClearFieldIfWanted;