fix(app): fix sidebar crash when switching iOS theme

Unistyles' StyleSheet.create((theme) => ...) wraps styled components in
<UnistylesComponent> and patches native view properties via C++. When
these dynamic styles are applied to Reanimated's Animated.View, a theme
change causes both systems to fight over the same native node, crashing
with "Unable to find node on an unmounted component."

Fix: use plain React Native StyleSheet for static positioning on
Animated.View, and pass theme-dependent values (backgroundColor) as
inline styles from useUnistyles() instead of Unistyles dynamic sheets.

Also:
- Add gestureAnimatingRef to prevent double withTiming during gesture opens
- Remove all debug instrumentation added during investigation
- Add Maestro flow and bash script for automated theme-toggle verification
- Add docs/MOBILE_TESTING.md covering Maestro patterns, self-verification
  loops, the Unistyles+Reanimated pitfall, and simulator commands

packages/app/maestro/.gitignore

@@ -0,0 +1,2 @@
+# Maestro takeScreenshot artifacts
+*.png

packages/app/maestro/sidebar-theme-repro.yaml

@@ -0,0 +1,31 @@
+appId: sh.paseo
+---
+# Ensure sidebar is closed: if sidebar-sessions is visible, close it via swipe left
+- runFlow:
+    when:
+      visible:
+        id: "sidebar-sessions"
+    commands:
+      - swipe:
+          direction: LEFT
+          duration: 300
+
+# Small pause for close animation
+- takeScreenshot: 00-sidebar-closed
+
+# Open sidebar via swipe right gesture (the actual path that triggers the bug)
+- swipe:
+    start: "5%,50%"
+    end: "80%,50%"
+    duration: 300
+
+# Verify sidebar opened
+- assertVisible:
+    id: "sidebar-sessions"
+- takeScreenshot: 01-sidebar-opened
+
+# Close sidebar via swipe left
+- swipe:
+    direction: LEFT
+    duration: 300
+- takeScreenshot: 02-sidebar-closed-again

packages/app/maestro/test-sidebar-theme.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# Verification loop for sidebar theme bug.
+#
+# Maestro can't toggle iOS appearance, so this script bridges the gap:
+# toggle appearance via xcrun simctl, then run Maestro to verify the sidebar
+# still works. Runs N iterations to catch intermittent failures.
+#
+# Usage:
+#   bash packages/app/maestro/test-sidebar-theme.sh [iterations] [wait_seconds]
+#   bash packages/app/maestro/test-sidebar-theme.sh 6 1
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
+FLOW="$REPO_ROOT/packages/app/maestro/sidebar-theme-repro.yaml"
+OUT_DIR="/tmp/sidebar-theme-test-$(date +%s)"
+ITERATIONS="${1:-3}"
+WAIT_SECS="${2:-1}"
+mkdir -p "$OUT_DIR"
+
+echo "=== Sidebar Theme Bug Verification ==="
+echo "Output dir: $OUT_DIR"
+echo "Iterations: $ITERATIONS, wait after toggle: ${WAIT_SECS}s"
+
+FAILURES=0
+
+for i in $(seq 1 "$ITERATIONS"); do
+  echo ""
+  echo "========== Iteration $i / $ITERATIONS =========="
+
+  CURRENT=$(xcrun simctl ui booted appearance 2>&1 | tr -d '[:space:]')
+  echo "Current appearance: $CURRENT"
+
+  if [ "$CURRENT" = "dark" ]; then
+    xcrun simctl ui booted appearance light
+    echo "Switched to light mode"
+  else
+    xcrun simctl ui booted appearance dark
+    echo "Switched to dark mode"
+  fi
+
+  echo "Waiting ${WAIT_SECS}s..."
+  sleep "$WAIT_SECS"
+
+  ITER_DIR="$OUT_DIR/iter-$i"
+  mkdir -p "$ITER_DIR"
+
+  # Run maestro from the output dir so takeScreenshot artifacts land there
+  if (cd "$ITER_DIR" && maestro test "$FLOW") 2>&1 | tee "$ITER_DIR/test.log"; then
+    echo "  -> PASS (iteration $i)"
+  else
+    echo "  -> FAIL (iteration $i) — bug reproduced!"
+    FAILURES=$((FAILURES + 1))
+    xcrun simctl io booted screenshot "$ITER_DIR/failure-state.png" 2>/dev/null || true
+  fi
+done
+
+# Restore to dark mode
+xcrun simctl ui booted appearance dark
+
+echo ""
+echo "=== Summary: $FAILURES failures out of $ITERATIONS iterations ==="
+echo "Output: $OUT_DIR"