feat(desktop): Tauri mac shell around the web export

Black screen root cause: Tauri injects nonces into style-src, which
makes WebKit drop 'unsafe-inline' and block react-native-web's inline
style attributes. style-src is now excluded from CSP modification.
Window opens on the home screen so the section menu is reachable.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wmf3K9nCoEsXvvwkmMnuiM

desktop/scripts/dev-web.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+# Start the Expo web dev server for `tauri dev`.
+#
+# Runs from src-tauri/ as Tauri's beforeDevCommand, or from desktop/ by hand.
+# Serves the GTD web UI on :8081 (devUrl in tauri.conf.json) with hot reload;
+# the Tauri window loads it and talks to https://gtd.rehbock.xyz/api.
+set -eu
+
+if [ -x "$HOME/.hermes/node/bin/node" ]; then
+  export PATH="$HOME/.hermes/node/bin:$PATH"
+fi
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+case "$HERE" in
+  */desktop/src-tauri/scripts) REPO="$(cd "$HERE/../../.." && pwd)" ;;
+  */desktop/scripts) REPO="$(cd "$HERE/../.." && pwd)" ;;
+  *) REPO="$(cd "$HERE/../.." && pwd)" ;;
+esac
+APP_DIR="$REPO/app"
+
+cd "$APP_DIR"
+exec npx expo start --web --port 8081