Add --algorithm and --overwrite flags to CLI

Support resize algorithm selection (lanczos3/catmullrom/bilinear/nearest)
and overwrite behavior (auto-rename/overwrite/skip) in the CLI process
command, matching the GUI functionality.

pixstrip-cli/src/main.rs

@@ -82,6 +82,14 @@ enum Commands {
         #[arg(long)]
         rename_template: Option<String>,
 
+        /// Resize algorithm (lanczos3, catmullrom, bilinear, nearest)
+        #[arg(long, default_value = "lanczos3")]
+        algorithm: String,
+
+        /// Overwrite behavior (auto-rename, overwrite, skip)
+        #[arg(long, default_value = "auto-rename")]
+        overwrite: String,
+
         /// Include subdirectories
         #[arg(short, long)]
         recursive: bool,
@@ -168,6 +176,8 @@ fn main() {
             rename_prefix,
             rename_suffix,
             rename_template,
+            algorithm,
+            overwrite,
             recursive,
         } => {
             cmd_process(CmdProcessArgs {
@@ -186,6 +196,8 @@ fn main() {
                 rename_prefix,
                 rename_suffix,
                 rename_template,
+                algorithm,
+                overwrite,
                 recursive,
             });
         }
@@ -225,6 +237,8 @@ struct CmdProcessArgs {
     rename_prefix: Option<String>,
     rename_suffix: Option<String>,
     rename_template: Option<String>,
+    algorithm: String,
+    overwrite: String,
     recursive: bool,
 }
 
@@ -311,6 +325,19 @@ fn cmd_process(args: CmdProcessArgs) {
         });
     }
 
+    job.resize_algorithm = match args.algorithm.to_lowercase().as_str() {
+        "catmullrom" | "catmull-rom" => ResizeAlgorithm::CatmullRom,
+        "bilinear" => ResizeAlgorithm::Bilinear,
+        "nearest" => ResizeAlgorithm::Nearest,
+        _ => ResizeAlgorithm::Lanczos3,
+    };
+
+    job.overwrite_behavior = match args.overwrite.to_lowercase().as_str() {
+        "overwrite" | "always" => OverwriteBehavior::Overwrite,
+        "skip" => OverwriteBehavior::Skip,
+        _ => OverwriteBehavior::AutoRename,
+    };
+
     for file in &source_files {
         job.add_source(file);
     }