Q-W2 review follow-ups: anon-namespace TU-private panel helpers, fix stale bank_panel.cpp comments, correct shim-transitivity claim

Wraps ~50 file-local helpers across all eight panel TUs in namespace{} (dissolves the menuAppend default-arg ODR trap); zero behavior change, 60/60 green.

src/shell/panel/panel_input.cpp

@@ -48,6 +48,8 @@ TailSetting currentTail() {
     return g_panel.session ? g_panel.session->tail() : TailSetting{};
 }
 
+namespace {
+
 // Commits the current tail setting to ext state and marks the active project dirty
 // so the change travels inside the .rpp on Ctrl+S. saveToActiveProject() is the only
 // path that calls SetProjExtState for the tail key — calling it here closes the gap
@@ -96,7 +98,7 @@ bool handleToolbarClick(int x, int y, const ActionBarRect& bar,
 
 // True iff `tr` has I_FREEMODE==2 (fixed lanes enabled). The SDK value is verified
 // in view.cpp (kFreeModeFixedLanes=2); reproduced here as a local constant so
-// bank_panel.cpp stays self-contained without pulling in view.cpp's private namespace.
+// panel_input.cpp stays self-contained without pulling in view.cpp's private namespace.
 constexpr int kFreeModeFixedLanes = 2;
 
 bool isFixedLaneTrack(MediaTrack* tr) {
@@ -104,7 +106,7 @@ bool isFixedLaneTrack(MediaTrack* tr) {
 }
 
 // Item GUID + fixed-lane name reads come from the shared item_read seam (item_read.h):
-// itemGuid(it) and itemLaneName(tr, it). bank_panel.cpp no longer carries its own copies.
+// itemGuid(it) and itemLaneName(tr, it). panel_input.cpp no longer carries its own copies.
 
 // Enumerates the live project's track + item GUIDs. Fills `allGuids` (the full live set,
 // baseline input) and, for each item, records whether it sits on a manual lane so a
@@ -319,6 +321,8 @@ bool handlePoolChromeClick(int x, int y, const RECT& region) {
     return false;
 }
 
+}  // namespace
+
 // Applies a left-click at (x, y): route to top toolbar / footer (toggle / Tail / Prune) /
 // bottom toolbar / region chrome / grid selection, and arm a potential drag when the click
 // lands on a selected cell. L4 order mirrors the three-zone layout top-to-bottom.
@@ -500,6 +504,8 @@ bool handleWheel(int x, int y, int delta) {
     return true;
 }
 
+namespace {
+
 bool isOurWindow(HWND hwnd) {
     for (HWND w = hwnd; w; w = GetParent(w))
         if (w == g_panel.hwnd) return true;
@@ -557,6 +563,8 @@ int translateAccel(MSG* msg, accelerator_register_t* /*ctx*/) {
 accelerator_register_t g_accel{translateAccel, true, nullptr};
 bool g_accelRegistered = false;
 
+}  // namespace
+
 void registerAccel() {
     if (g_accelRegistered || !g_rec) return;
     g_rec->Register("accelerator", &g_accel);