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_bank_ops.cpp

@@ -87,6 +87,8 @@ std::vector<const Bank*> namedBanks() {
 // unsaved project the empty-close discard in persistBankOp ensures no stale state
 // survives (matches the capture/B3 quiet-persist idiom).
 
+namespace {
+
 // REAPER's stock single-line input (comma-safe via the \x1f return separator, as B3).
 bool promptText(const char* title, const char* caption, const std::string& initial,
                 std::string& out) {
@@ -111,6 +113,8 @@ std::string mintBankId() {
     return std::string(buf);
 }
 
+}  // namespace
+
 void doCreateBank() {
     if (!book()) return;
     std::string name;
@@ -127,6 +131,8 @@ void doCreateBank() {
     invalidatePanel();
 }
 
+namespace {
+
 void doRenameBank(const std::string& bankId) {
     if (!book()) return;
     const Bank* bk = book()->bank(bankId);
@@ -198,6 +204,8 @@ void doActivateBank(const std::string& bankId) {
     invalidatePanel();
 }
 
+}  // namespace
+
 // Move or copy `sampleIds` from `srcBankId` to `destBankId` (index-only). Both pass
 // ids straight to the model op (no BankModel& cached across the loop's mutations).
 //
@@ -312,6 +320,8 @@ std::vector<std::string> resolveDragPathsForOs() {
 // Menu command ids are LOCAL to the popup (not REAPER action ids) — TPM_RETURNCMD
 // hands the chosen id straight back, so no hookcommand routing is involved.
 
+namespace {
+
 // Appends a string item (id) to `menu` at its end. Portable over Win32/SWELL: both
 // accept InsertMenu(menu, pos, MF_BYPOSITION|MF_STRING, id, text) with a negative
 // position appending. Win32 and SWELL both treat pos < 0 as an append.
@@ -337,6 +347,8 @@ enum : unsigned int {
     kMenuCopyBase = 2000,   // copy-to-bank: kMenuCopyBase + destination index
 };
 
+}  // namespace
+
 // Shows the right-click context menu for a named-bank TAB: activate / rename / delete
 // / evacuate that bank, plus a create entry. Drives the id-keyed ops.
 void showTabMenu(int screenX, int screenY, const std::string& bankId) {

src/shell/panel/panel_drag.cpp

@@ -30,6 +30,8 @@ namespace reasampler::panel {
 
 constexpr int kDragThreshold = 5;  // px the pointer must move to begin a drag
 
+namespace {
+
 // Resolves the drop target under client (x, y) during a drag, updating dropKind /
 // dropBankId. A drop onto the pool region -> the pool; onto a named tab -> that bank;
 // anywhere else -> none.
@@ -234,6 +236,8 @@ void updateHover(int x, int y) {
     }
 }
 
+}  // namespace
+
 // Applies the tooltip hover-delay: if a tooltip-bearing element has been hovered past
 // kTooltipDelayMs and the tooltip is not yet shown, latch it and repaint once. Driven from the
 // OnTimer poll (bankPanelRefresh) so the tooltip appears after a rest with no dedicated timer;
@@ -365,6 +369,8 @@ void onMouseMove(int x, int y) {
 // batched undo point + saves). A no-op reorder (already at the target, model returns false)
 // opens no undo point. Selection reasons over slot order, so it is cleared after — the
 // fingerprint pass rebuilds it against the new order.
+namespace {
+
 void doReorderDrop(const std::string& id, const std::string& bankId, int targetSlot) {
     if (!book() || id.empty() || bankId.empty() || targetSlot < 0) return;
     if (!book()->reorderSample(id, bankId, targetSlot)) return;  // rejected/no-op: no undo point
@@ -386,6 +392,8 @@ void doReplaceDrop(const std::string& newId, const std::string& oldId,
     invalidatePanel();
 }
 
+}  // namespace
+
 // Clears all drag-state fields to their resting values. Called from every exit path
 // (button-up, WM_CAPTURECHANGED, WM_DESTROY, closePanel) so the set of cleared fields
 // stays consistent across all four sites.

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);

src/shell/panel/panel_layout.cpp

@@ -49,6 +49,8 @@ int modeCount() {
 // buttons tile into the band MINUS the menu reserve (topToolbarActionRect), so they never run
 // under the menu button (L5 refinement 1).
 
+namespace {
+
 ActionBarRect topToolbarRect(int w) {
     ActionBarRect s;
     s.x = 0;
@@ -67,6 +69,8 @@ MenuBarRect topMenuBarRect(int w) {
 // The More button's rect (right-anchored in the top band). Empty when the band is too narrow
 // to place it clear of its left inset — the three variants stay reachable via their bindable
 // commands (graceful suppression).
+}  // namespace
+
 MenuButtonRect topMenuButtonRect(int w) {
     return computeMenuButton(topMenuBarRect(w), kMenuBtnSpec);
 }
@@ -200,6 +204,8 @@ std::vector<ActionBarRow> overflowMenuRows() {
     };
 }
 
+namespace {
+
 // The active mode id the opposite-mode gate + footer toggle both read (ONE source of truth for
 // "which mode is active"). Empty when no session (every button then falls to fail-open live).
 std::string activeModeIdOrEmpty() {
@@ -207,6 +213,8 @@ std::string activeModeIdOrEmpty() {
     return g_panel.session->view().activeModeId();
 }
 
+}  // namespace
+
 // The BOTTOM toolbar inventory (L5 refinement 3): FOUR Item/Track x Arrange/Design tag buttons
 // then a set-apart Show Both. The suffixes are the ACTUAL registered command-id strings from
 // actions.cpp (VIEW_MOVE_ITEMS_ARRANGE / VIEW_MOVE_ITEMS_DESIGN for the item moves;
@@ -290,6 +298,8 @@ int resolveBarCommandId(const ActionBarRow& row) {
     return NamedCommandLookup(named.c_str());
 }
 
+namespace {
+
 // The current key binding string for a command in the MAIN section, or "" (unbound / not
 // registered). Queried via kbd_getTextFromCmd (SectionFromUniqueID(0)).
 std::string barBindingText(int cmd) {
@@ -300,6 +310,8 @@ std::string barBindingText(int cmd) {
     return {};
 }
 
+}  // namespace
+
 // The flat action index under (x, y) in `bar` for the given row set, or -1 (miss). Pure hit-test.
 int toolbarHit(int x, int y, const ActionBarRect& bar, const std::vector<ActionBarRow>& rows) {
     if (bar.height <= 0) return -1;

src/shell/panel/panel_render.cpp

@@ -23,6 +23,8 @@
 
 namespace reasampler::panel {
 
+namespace {
+
 // --- Drawing: thumbnails (via the kit's shared drawWaveform since FA3) ---------
 
 // Draws the L7 decorative metadata overlay on a card: bars.beats.subdivisions bottom-LEFT
@@ -506,6 +508,8 @@ std::string activeBankName() {
     return bk ? bk->displayName : std::string(kPoolBankName);
 }
 
+}  // namespace
+
 // --- Full paint ---------------------------------------------------------------
 
 void paintPanel(HWND hwnd, HDC hdc) {

src/shell/panel/panel_state.h

@@ -14,10 +14,12 @@
 //     plain free function — direct call-through, no interface, no virtual dispatch
 //     (T4-28: the audition path and the per-mouse-move path must stay direct calls).
 //   * Explicit using-declarations pulling the pure modules' symbols into
-//     reasampler::panel from their REAL namespace homes (Q-W1 sub-namespaces) — the
+//     reasampler::panel from their REAL namespace homes (Q-W1 sub-namespaces) — this
-//     panel TUs do NOT include the interim core/namespaces.h shim (Q-W2 retires it
+//     header itself does not directly include the interim core/namespaces.h shim
-//     for this module; some still-unsplit shell headers carry it transitively until
+//     (Q-W2 retires that direct dependency for this module). Six of the eight panel
-//     their own waves, but nothing here depends on it).
+//     TUs still pull the shim in TRANSITIVELY via actions.h/persist.h/ingest.h/
+//     draw_kit.h/view.h; only panel_thumbnails.cpp and panel_audition.cpp are
+//     shim-free end to end. Nothing HERE depends on it either way.
 //
 // REFERENCE-INVALIDATION GUARDRAIL (CONTEXT.md §Multi-bank): a bank-structural
 // mutation (create/delete/evacuate/activate/move) can reallocate the book's vector,

src/shell/panel/panel_thumbnails.cpp

@@ -25,6 +25,8 @@
 
 namespace reasampler::panel {
 
+namespace {
+
 constexpr int kMaxThumbnailFrames = 1 << 20;  // ~1M frames (~22s @ 48k)
 
 // --- Thumbnail computation (M5; `width` is a BIN count since FA3 oversampling) --
@@ -78,6 +80,8 @@ Envelope computeThumbnail(const std::string& absPath, int width) {
                            static_cast<std::size_t>(binCount));
 }
 
+}  // namespace
+
 const Envelope& thumbnailFor(const Sample& sample, int width,
                              const std::string& projectDir) {
     ThumbnailKey key{sample.id, width, g_panel.generation};
@@ -96,6 +100,8 @@ const Envelope& thumbnailFor(const Sample& sample, int width,
 
 // --- Bank-change detection ----------------------------------------------------
 
+namespace {
+
 // A fingerprint of the WHOLE BOOK: for each bank, its id + display name + active flag
 // + per-sample id/path. Catches every mutation the panel must redraw for: capture,
 // project load, and B4's own create/rename/delete/move/activate.
@@ -119,6 +125,8 @@ std::string bookFingerprint() {
     return fp;
 }
 
+}  // namespace
+
 // Reconciles shownBankId against the live named banks: keep it if it still names a
 // named bank; otherwise fall to the first named bank (or empty when none). Keeps the
 // banks region always showing a valid tab. Never touches the ACTIVE bank.

src/shell/panel/panel_window.cpp

@@ -46,6 +46,8 @@ PanelState g_panel;
 
 // --- Dialog proc + docking ----------------------------------------------------
 
+namespace {
+
 // Decodes a WM_DROPFILES HDROP into the dropped file paths (absolute, OS-native) and hands
 // them to the S8 ingest path. Multi-file drop: ingestDroppedFiles imports all into the active
 // bank (bank-fill only — no assignment to any live instance). Always DragFinish's the HDROP
@@ -193,6 +195,8 @@ void closePanel() {
     g_panel.open = false;
 }
 
+}  // namespace
+
 }  // namespace reasampler::panel
 
 // --- Public API (the lifecycle seam — panel_window.h) --------------------------