docs(multi-bank): settle fork 5 — LICE tabs + both move affordances (Phase B closed)

5a: named-banks tab strip is LICE-drawn (matching M5 grid + Design View
segmented switch), with overflow/scroll in scope from B4 start.
5b: move ships as both a bindable "move to bank" menu and drag-between-regions;
copy stays the deliberate secondary act. Drag mis-drop mitigated by drop-target
highlighting and recoverable by design (index-only, reversible).

Phase B now fully settled (all five forks resolved), ready to scope into
implementation waves; only the active-bank indicator placement polish remains.

CONTEXT.md

@@ -468,9 +468,16 @@ REAPER-facing:
   layer adds to.
 - `bank_panel` (extension) — the vertical split: pool grid on top, named-banks
   tab-page region below; two full-height toggles; the active-bank indicator; the
-  create / rename / delete / activate affordances; sample move/copy affordance
-  (drag between regions and/or a "send to bank" menu on selection). Reuses the
-  existing LICE grid render loop per bank region.
+  create / rename / delete / activate affordances. The named-banks tab strip is
+  **LICE-drawn** to match the M5 grid and the Design View segmented switch (not a
+  SWELL-native tab control), with an **overflow/scroll affordance** so it scales past
+  the ~8–12-tab point. Sample move ships **both ways**: a "move to bank" menu on the
+  current selection (the bindable front-end for the B3 move action) and
+  drag-between-regions (the direct-manipulation accelerator); copy is the deliberate
+  secondary act, offered on the menu. Drag carries clear drop-target highlighting on
+  the destination region/tab, and a mis-drop is recoverable by design (move is
+  index-only and reversible — the user moves the sample back). Reuses the existing
+  LICE grid render loop per bank region.
 - `actions` (entries) — create bank / rename bank / delete bank (confirm on
   non-empty delete); evacuate bank → pool; activate bank (direct + cycle); move
   selected samples → bank; copy selected samples → bank; pool/banks full-height
@@ -486,9 +493,13 @@ verify against the SDK header where they extend existing surfaces:
 - **Persistence:** `SetProjExtState` / `GetProjExtState` under `"reasampler"`, new
   key `banks` (shared blob machinery from M4 — no new API, new key only).
 - **Panel UI:** the docked-window + LICE-grid surface from M5 (`bank_panel`),
-  extended to two grid regions + a tab strip + toggles. SWELL controls for the tab
-  strip / toggle affordances follow the M5 docking pattern; **verify SWELL control
-  usage against the M5 reference**, no new REAPER audio API involved.
+  extended to two grid regions + a **LICE-drawn** tab strip (with overflow/scroll) +
+  toggles. The tab strip, the toggle affordances, and the drag hit-testing are
+  custom-drawn on the M5 LICE surface (not SWELL-native tabs); the "move to bank" menu
+  uses a SWELL popup-menu surface. **Verify LICE drawing and any SWELL menu/drag
+  hit-test usage against the M5 reference / SWELL headers**, and confirm the drag
+  hit-test does not collide with the M5 grid's multi-select drag. No new REAPER audio
+  API involved.
 - **Actions:** the `command_id` / `gaccel` / `hookcommand` contract from `main.cpp`
   (unchanged), new command-id strings under the sampler family prefix.
 
@@ -515,18 +526,21 @@ verify against the SDK header where they extend existing surfaces:
 
 ## Open questions to resolve during build
 
-Forks 1–4 are settled (see product notes → *Settled forks*, and the settled-decision
-prose above). Two panel-build items remain open.
+Forks 1–5 are all settled (see product notes → *Settled forks* and *Fork 5 — settled*,
+and the settled-decision prose above). One panel-polish detail remains open.
 
-- **Fork 5 — tab rendering + move affordance (B4).** Two sub-questions: (5a) the
-  named-banks region as a SWELL-native tab control vs. LICE-drawn tabs matching the
-  grid aesthetic; (5b) the move gesture as drag-between-regions vs. a "send to bank"
-  menu vs. both. Full options analysis (pros/cons across visual consistency, keyboard
-  nav, HiDPI, cross-platform SWELL parity, scaling, discoverability, mis-drop risk,
-  MIDI-bindability, implementation cost) and pending recommendations in product notes
-  → *Fork 5*. **Verify SWELL tab-control availability and cross-platform behavior
-  parity against the SWELL headers / SWS reference** before committing to native tabs.
-  Decision pending Daniel.
+- **Fork 5 — tab rendering + move affordance (B4). Settled (2026-07-23).** (5a) The
+  named-banks region is **LICE-drawn** to match the M5 grid and the Design View
+  segmented switch — not a SWELL-native tab control — with an **overflow/scroll
+  affordance in scope from the start** so the strip scales past the ~8–12-tab
+  breakdown. (5b) Move ships as **both** a "move to bank" menu (the precise,
+  MIDI-bindable front-end for the B3 move action) **and** drag-between-regions (the
+  direct-manipulation accelerator); copy stays the deliberate secondary act via the
+  menu. Drag mis-drop is mitigated by drop-target highlighting and is recoverable by
+  design (move is index-only and reversible). Folded into the `bank_panel` prose and
+  the API surface below. **Verify LICE tab drawing and any SWELL menu/drag hit-test
+  surface against the M5 reference / SWELL headers before use** (confirm no collision
+  with the M5 grid's multi-select drag). Analysis in product notes → *Fork 5*.
 - **Active-bank indicator placement (B4 polish)** — per-region headers vs. a single
   header readout vs. lit-tab treatment. The "visually unmistakable" requirement is
   settled (fork 4); only the placement is open. Panel-polish detail.