Adds UI tweaks nightly

requirements/metadata_editor.md

@@ -104,6 +104,11 @@ The main missing pieces are:
 - `METADATA_EDITOR-0013`: The command shall write changes through an ffmpeg
   stream-copy remux workflow only. No transcoding shall be performed as part of
   `ffx edit`.
+- `METADATA_EDITOR-0013A`: The ffmpeg invocation used by `ffx edit` shall map
+  all source streams with `-map 0` and shall copy all mapped streams with a
+  single `-c copy`. It shall not emit conversion-style per-stream `-map` or
+  `-c:*` options that could drop, reorder, or transcode streams during a
+  metadata-only edit.
 - `METADATA_EDITOR-0014`: Because ffmpeg cannot rewrite the source file in
   place, `ffx edit` shall write to a temporary output file on the same
   filesystem as the source file and shall replace the original path only after
@@ -130,13 +135,19 @@ The main missing pieces are:
   configuration shall be surfaced clearly in the UI and in the planned-changes
   view. If those rules are applied during save, the operator shall be able to
   tell that the file will be cleaned in addition to any manual edits.
-- `METADATA_EDITOR-0022`: The command shall provide an invocation-level way to
-  disable config-driven cleanup when the operator wants a pure manual metadata
-  edit without automatic tag removal.
+- `METADATA_EDITOR-0022`: Edit mode shall provide an in-screen operator toggle
+  for config-driven cleanup so a user can switch between pure manual metadata
+  edits and metadata edits plus configured tag cleanup without leaving the
+  editor.
 - `METADATA_EDITOR-0023`: The existing global `--dry-run` behavior shall apply
   to `ffx edit`. In dry-run mode the command shall not replace the original
   file and shall expose the planned write operation clearly enough for the user
   to understand what would happen.
+- `METADATA_EDITOR-0024`: Every ffmpeg invocation performed by `ffx edit`
+  shall be surfaced to the operator as a notification in the edit UI.
+- `METADATA_EDITOR-0025`: When application verbosity is greater than zero, the
+  notification for an `ffx edit` ffmpeg invocation shall include the concrete
+  ffmpeg command line.
 
 ## Acceptance
 
@@ -154,6 +165,8 @@ The main missing pieces are:
 - The planned-changes view reflects manual edits relative to the original file
   and, when enabled, any configured cleanup removals.
 - No rendered Rich or Textual color markup appears in the saved file metadata.
+- Saving metadata with files that contain PGS subtitle tracks or other
+  non-text subtitle codecs preserves those streams instead of dropping them.
 - If ffmpeg fails while saving, the original file remains present and readable
   at the original path.
 - In dry-run mode, the original file remains untouched.