feat(banks): bindable multi-bank action family — create/rename/delete/evacuate/activate/move/copy + full-height toggles (B3)

src/bank_panel.h

@@ -61,6 +61,36 @@ void bankPanelRefresh();
 // state only; the toggle is mutated by a click inside the panel, never here.
 TailSetting bankPanelTailSetting();
 
+// The vertical-split full-height layout state (Phase B). The bank window splits
+// vertically — pool on top, named-banks region below — and two toggles collapse the
+// split: pool full-height (hide the named-banks region) and banks full-height (hide
+// the pool). The two are mutually exclusive with the default (both regions shown),
+// so one enum captures the whole state.
+//
+// This bit is B3-owned (the actions flip it); B4's panel RENDERS from it. It lives
+// here beside the tail setting — the other session-level view-layout bit the panel
+// reads — NOT in the persisted ReaSamplerSession: it is a UI-layout preference, not
+// project state, so it must not travel with the .rpp. In-memory for the extension's
+// lifetime; resets to Split on unload.
+enum class BankPanelFullHeight {
+    Split,       // default: pool region on top, named-banks region below
+    PoolOnly,    // pool full-height — named-banks region hidden
+    BanksOnly,   // banks full-height — pool region hidden
+};
+
+// The current full-height layout state (default Split). READ by B4's panel to decide
+// which region(s) to draw. Safe before the panel has ever opened.
+BankPanelFullHeight bankPanelFullHeight();
+
+// Toggles pool full-height: Split <-> PoolOnly. From PoolOnly returns to Split; from
+// either other state (Split or BanksOnly) enters PoolOnly. Bound to the "pool
+// full-height" action. Requests a repaint so an open panel reflects the change.
+void bankPanelToggledPoolFullHeight();
+
+// Toggles banks full-height: Split <-> BanksOnly, symmetric to the pool toggle.
+// Bound to the "banks full-height" action. Requests a repaint.
+void bankPanelToggledBanksFullHeight();
+
 // Tears the panel down on extension unload: destroys the window and releases any
 // cached thumbnails / PCM handles. Mirror of bankPanelInit; safe if never opened.
 void bankPanelShutdown();