Volume/pan/EQ tab overhaul: one master switch, peer checklist, 16-band parametric EQ

Reworks the per-peer shaping tab (held for next release):

 * Renamed the tab to "Volume, pan and EQ for peers"; the Preferences toggle now defaults ON.
 * Collapsed the two master switches (Enable EQ / Enable pan) into ONE: "Enable volume, pan and
   EQ for all peers" (Alt+E). Volume now obeys it too. PeerDspChain.Build takes a single enabled
   flag; Profile.EnableAllPeerShaping replaces the two bools (old ones kept for load-migration).
 * Peer picker is now a CheckedListBox: ticking a peer shapes them (per-peer bypass via new
   PeerShaping.Enabled, default true); the focused row is the one the controls edit. Effective
   shaping = master switch AND that peer's tick. Letter-nav suppressed so keys never toggle a tick.
 * Three EQ modes, renamed: "3 band simple EQ", "12 band advanced graphic EQ", and the new
   "16 band parametric EQ" (PeerEqMode.Parametric16Band).
 * Parametric EQ: up to 16 user bands, each a boost/cut across a start->end range (PeerShaping
   .ParametricBands; ParametricToPeaking maps range -> peaking centre+Q, shared by DSP and curve).
   Add band dialog (spin-or-type, numeric-only, live preview, OK/Escape); Bands list sorted
   bass->treble reading "X Hz to Y Hz, plus/minus N dB"; Delete key / Delete button, multi-select.
   Set peer EQ to default clears the parametric list too.
 * dB now spoken as words ("plus 3 dB" / "minus 6 dB" / "flat") on the graphic sliders and the
   parametric list, since NVDA users typically have punctuation off and never hear a "+".
 * New unbound machine-wide global shortcut "Toggle volume, pan and EQ for all peers" (not stored
   in any profile) via the hotkey controller + settings store.
 * Renamed the Inputs/outputs "Set volume for all received audio" to "Master receive volume".
 * Added EqCurveControl: a purely-visual EQ response graph (not focusable, invisible to NVDA).
 * Full manual sweep (readme.html + regenerated MANUAL.md).

Build clean; --selftest passes. Deployed to both test folders. Held for next release.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pi server/uninstall.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+# uninstall.sh — Remove the RemSound UDP relay and its auto-updater cleanly.
+#
+# Run with sudo:
+#   sudo ./uninstall.sh
+#
+# Stops and disables both the relay and the updater timer, removes their
+# scripts and unit files, and removes the /etc/remsound-relay/ state dir
+# (version file + rollback backups). Leaves log files in place — rename or
+# delete them yourself if you don't want them kept. Does NOT touch your
+# router port-forward — that's separate.
+
+set -euo pipefail
+
+if [[ $EUID -ne 0 ]]; then
+  echo "This uninstaller must run as root. Try: sudo ./uninstall.sh" >&2
+  exit 1
+fi
+
+# Stop the updater timer first so it can't fire mid-uninstall.
+if systemctl list-unit-files remsound-relay-update.timer >/dev/null 2>&1; then
+  echo "Stopping remsound-relay-update.timer ..."
+  systemctl stop remsound-relay-update.timer 2>/dev/null || true
+  systemctl disable remsound-relay-update.timer 2>/dev/null || true
+fi
+
+if systemctl list-unit-files remsound-relay-update.service >/dev/null 2>&1; then
+  systemctl stop remsound-relay-update.service 2>/dev/null || true
+fi
+
+if systemctl list-unit-files remsound-relay.service >/dev/null 2>&1; then
+  echo "Stopping remsound-relay.service ..."
+  systemctl stop remsound-relay.service 2>/dev/null || true
+  echo "Disabling remsound-relay.service ..."
+  systemctl disable remsound-relay.service 2>/dev/null || true
+fi
+
+for f in \
+  /etc/systemd/system/remsound-relay.service \
+  /etc/systemd/system/remsound-relay-update.service \
+  /etc/systemd/system/remsound-relay-update.timer \
+  /usr/local/sbin/remsound-relay.py \
+  /usr/local/sbin/remsound-relay-update.sh
+do
+  if [[ -f "$f" ]]; then
+    echo "Removing $f ..."
+    rm -f "$f"
+  fi
+done
+
+if [[ -d /etc/remsound-relay ]]; then
+  echo "Removing /etc/remsound-relay/ (version stamp + backup) ..."
+  rm -rf /etc/remsound-relay
+fi
+
+systemctl daemon-reload
+
+echo
+echo "Uninstall complete."
+echo "Note: log files left in place — delete them yourself if you don't want them:"
+echo "  /var/log/remsound-relay.log"
+echo "  /var/log/remsound-relay-update.log"
+echo "Note: any router port-forward you added for UDP 47830 is unchanged — remove that yourself if you no longer need it."