fix: theme-Auswahl + SDDM-Theme-Correctness

Drei Probleme gefixt:

1. Theme-Auswahl waehrend Install
   - apply-theme.sh zeigt jetzt alle .theme-Files via tui_choose
   - Benutzer waehlt interaktiv (gum/whiptail/basic)
   - Bei nur einem Theme: auto-select

2. SDDM wendet falsches Theme an
   - sddm.sh erzeugt /var/lib/pascal-sddm-theme/ mit user chown
   - Liest current-theme.conf + hyprpaper.conf fuer aktuelle Farben
   - Schreibt theme.conf in /usr/share/sddm/themes/pascal-hypr/
   - Config heisst jetzt 90-pascal-hypr.conf (hoehere Priority)
   - apply-theme.sh erzeugt state dir VOR theme-menu.sh --apply

3. tui_choose basic mode fix
   - ${!choice} funktioniert nicht fuer numerische Indices
   - labels+=("$@") + ${labels[$choice]} statt Positional-Params

modules/post/apply-theme.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 module_description() {
-  printf "Apply Theme - set default Hyprland theme and restart services\n"
+  printf "Apply Theme - select and apply a Hyprland theme\n"
 }
 
 module_required() { return 1; }
@@ -22,36 +22,69 @@ module_main() {
     return 1
   fi
 
-  local default_theme="${OMERON_DEFAULT_THEME:-forest-neon}"
+  local theme_files=()
+  mapfile -t theme_files < <(find "$themes_dir" -name '*.theme' -type f | sort 2>/dev/null)
 
-  local theme_file=""
-  if [[ -f "$themes_dir/$default_theme.theme" ]]; then
-    theme_file="$themes_dir/$default_theme.theme"
-  elif [[ -f "$themes_dir/forest-neon.theme" ]]; then
-    theme_file="$themes_dir/forest-neon.theme"
-  elif [[ -f "$themes_dir/rose-night.theme" ]]; then
-    theme_file="$themes_dir/rose-night.theme"
-  else
-    local available
-    available="$(find "$themes_dir" -name '*.theme' -type f | head -1)"
-    if [[ -n "$available" ]]; then
-      theme_file="$available"
-    fi
-  fi
-
-  if [[ -z "$theme_file" ]]; then
+  if ((${#theme_files[@]} == 0)); then
     log_warn "No theme files found in $themes_dir"
     return 1
   fi
 
-  if tui_confirm "Apply theme: $(basename "$theme_file" .theme).theme?"; then
-    log_info "Applying theme: $(basename "$theme_file")"
-    tui_spin "Applying theme..." bash "$theme_script" --apply "$theme_file"
+  local theme_names=()
+  local file
+  for file in "${theme_files[@]}"; do
+    theme_names+=("$(basename "$file" .theme)")
+  done
 
-    if have notify-send; then
-      notify-send "Omeron" "Theme applied: $(basename "$theme_file" .theme)" >/dev/null 2>&1 || true
+  tui_bold "Available themes:"
+  local i
+  for i in "${!theme_names[@]}"; do
+    tui_info "[$i] ${theme_names[$i]}"
+  done
+  printf '\n'
+
+  local choice
+  if ((${#theme_files[@]} == 1)); then
+    tui_info "Only one theme available, auto-selecting: ${theme_names[0]}"
+    choice="${theme_files[0]}"
+  else
+    choice="$(
+      local labels=()
+      for name in "${theme_names[@]}"; do
+        labels+=("$name")
+      done
+      tui_choose "Select a theme" "${labels[@]}"
+    )"
+    if [[ -z "$choice" ]]; then
+      log_info "No theme selected, skipping"
+      return 0
     fi
-
-    log_success "Theme applied: $(basename "$theme_file" .theme)"
+    local idx
+    for idx in "${!theme_names[@]}"; do
+      if [[ "$choice" == "${theme_names[$idx]}" ]]; then
+        choice="${theme_files[$idx]}"
+        break
+      fi
+    done
   fi
+
+  if [[ -z "$choice" || ! -f "$choice" ]]; then
+    log_warn "Invalid theme selection"
+    return 1
+  fi
+
+  log_info "Selected theme: $(basename "$choice" .theme)"
+
+  if ! tui_confirm "Apply theme: $(basename "$choice" .theme)?"; then
+    log_info "Theme application skipped"
+    return 0
+  fi
+
+  sudo_run mkdir -p /var/lib/pascal-sddm-theme 2>/dev/null || true
+  sudo_run chown "$(id -u):$(id -g)" /var/lib/pascal-sddm-theme 2>/dev/null || true
+
+  log_info "Applying theme..."
+  tui_spin "Applying theme..." bash "$theme_script" --apply "$choice"
+
+  log_success "Theme applied: $(basename "$choice" .theme)"
 }