Ship default config/panels/themes with the app: --init, XDG discovery, build/CI bundling

- tui-wm --init [DIR] writes an embedded default config.toml,
  panels/topbar.toml and themes/{dark,light}.toml (default target
  ~/.config/tui-wm, existing files untouched)
- Config discovery: ./config.toml wins, otherwise ~/.config/tui-wm/
  is used (process switches working dir there so panels/themes/saves/
  hot-reload all resolve consistently); spawned PTYs still start in
  the user's original working directory
- VS Code build tasks copy themes/ into builds/, dist/ sample configs
  refreshed with all new keys and the settings gear
- CI release now also uploads tui-wm-config.tar.gz (config + panels +
  themes) alongside the binaries

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -38,7 +38,10 @@ jobs:
           mkdir -p build
           cp target/release/tui-wm build/tui-wm-linux-arm64
           cp target/x86_64-unknown-linux-gnu/release/tui-wm build/tui-wm-linux-x64
-          (cd build && sha256sum tui-wm-linux-* > checksums.txt && ls -la)
+          # Standardkonfiguration (config + paneler + teman) som eget paket.
+          # Binären kan också skapa allt själv med `tui-wm --init`.
+          tar czf build/tui-wm-config.tar.gz config.toml panels themes
+          (cd build && sha256sum tui-wm-linux-* tui-wm-config.tar.gz > checksums.txt && ls -la)
 
       - name: Skapa/uppdatera latest-release + ladda upp binärer
         env:
@@ -55,7 +58,7 @@ jobs:
           [ -z "$rid" ] && rid=$(curl -s "$API/repos/$REPO/releases/tags/$TAG" \
             -H "Authorization: token $TOKEN" | jq -r '.id')
           echo "release id: $rid"
-          for f in tui-wm-linux-x64 tui-wm-linux-arm64 checksums.txt; do
+          for f in tui-wm-linux-x64 tui-wm-linux-arm64 tui-wm-config.tar.gz checksums.txt; do
             aid=$(curl -s "$API/repos/$REPO/releases/$rid/assets" \
               -H "Authorization: token $TOKEN" | jq -r ".[] | select(.name==\"$f\") | .id")
             if [ -n "$aid" ] && [ "$aid" != "null" ]; then