fix(view): park untagged leaves in non-Arrange modes; refresh TCP/MCP on apply

planToggle now enumerates all leaves in the FolderTree instead of only tagged
membership entries, so untagged (Arrange-member) tracks park in Design and
restore in Arrange. applyMode calls TrackList_AdjustWindows + UpdateArrange so
changes render immediately. Correct the stale "tagged-only" invariant comments.

src/view.h

@@ -15,8 +15,10 @@
 //   * Never touches the master track's visibility (SDK forbids B_SHOWINTCP/
 //     B_SHOWINMIXER on master); the master is never a node in the tree.
 //   * Never reads or writes B_MUTE / I_SOLO on any track.
-//   * Acts only on tracks the model owns (tagged leaves the planner names) plus
-//     derived parents' visibility — never an untagged track's owned flags.
+//   * Manages ALL leaves via the mode system: an untagged leaf is an Arrange member,
+//     so it is fully parked in non-Arrange modes and restored in Arrange, identically
+//     to a tagged leaf. show-both is the always-visible escape; parents are
+//     visibility-only (derived); the master is never touched.
 //   * Snapshots every to-be-parked track's prior flags BEFORE parking, storing
 //     them into the model so restore is faithful and survives a save-while-parked.