Add fit-to-size two-pass encoding, file argument, recipes, and batch mode

- Fit to size: computes H.264 bitrate from duration and runs a
  two-pass encode to land on a target size in MB
- lazyff FILE opens straight in the editor
- Recipes: save/load named edit stacks (~/.config/lazyff/recipes.json)
- Batch: mark files with Space, run one edit stack across all of them
  through a sequential job queue with per-file results

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lazyff"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 description = "A friendly TUI for FFmpeg — trim, resize, crop, compress and convert without memorizing flags"