fix(vanity_setup): Improve script robustness and fix runtime errors

This commit addresses three separate issues identified during the execution of the vanity setup script:

1.  **Handle existing fonts gracefully**: The `brew_ensure_cask` function is modified to catch the specific error that occurs when a font cask is installed but the font file already exists. Instead of failing, the script now reports the font as already present and continues.

2.  **Fix Docker plugin load order**: The `install_zsh_config` function now prepends the `brew shellenv` command to the downloaded `.zshrc` file. This ensures the Homebrew PATH is set *before* Oh My Zsh loads its plugins, resolving the `command not found: docker` error on shell startup.

3.  **Automatically update yt-dlp**: The `brew_ensure_formula` function is updated to automatically run `brew upgrade yt-dlp` if the formula is already installed. This keeps the tool up-to-date and prevents download failures (like HTTP 403 errors) caused by an outdated version.

vanity_setup.sh

@@ -138,7 +138,12 @@ install_homebrew() {
 brew_ensure_formula() {
   local formula="$1"
   if brew list --formula "$formula" >/dev/null 2>&1; then
+    if [[ "$formula" == "yt-dlp" ]]; then
+      echo "➜ yt-dlp ya está instalado. Actualizando a la última versión…"
+      brew upgrade yt-dlp
+    else
       echo "✔︎ ${formula} ya está instalado. Omitiendo."
+    fi
     return
   fi
 
@@ -154,7 +159,16 @@ brew_ensure_cask() {
   fi
 
   echo "➜ Instalando ${cask}…"
-  brew install --cask "$cask"
+  local output
+  if ! output=$(brew install --cask "$cask" 2>&1); then
+    if [[ "$output" == *"already a Font at"* ]]; then
+      echo "✔︎ La fuente de ${cask} ya existe. Omitiendo."
+    else
+      echo "$output" >&2
+      echo "Error al instalar ${cask}." >&2
+      return 1
+    fi
+  fi
 }
 
 install_cli_dependencies() {
@@ -257,12 +271,23 @@ install_zsh_config() {
   mkdir -p "$HOME/.poshthemes"
   curl -fsSL "$POSH_THEME_URL" -o "$POSH_THEME_PATH"
 
-  echo "Descargando .zshrc de Vanity Shell…"
-  if ! curl -fsSL "$ZSHRC_URL" -o "$HOME/.zshrc"; then
+  echo "Descargando y configurando .zshrc de Vanity Shell…"
+  local zshrc_content
+  if ! zshrc_content=$(curl -fsSL "$ZSHRC_URL"); then
     echo "No se pudo descargar la configuración de ZSH." >&2
     exit 1
   fi
 
+  local brew_init_line=""
+  if [ -n "$BREW_BIN" ]; then
+    # Esta línea se añade al principio para garantizar que el PATH de Homebrew
+    # se configure ANTES de que Oh My Zsh intente cargar plugins como 'docker'.
+    brew_init_line="eval \"\$($BREW_BIN shellenv)\""
+  fi
+
+  # Combina la inicialización de Homebrew con el contenido descargado
+  echo -e "${brew_init_line}\n\n${zshrc_content}" > "$HOME/.zshrc"
+
   if command -v pbcopy >/dev/null 2>&1; then
     echo "source ~/.zshrc" | pbcopy
     echo "El comando 'source ~/.zshrc' fue copiado al portapapeles."