Copy rewrapped should handle with nested quotes

Start at the Copy rewrapped command or action and reproduce the nested-quote example from the issue, checking how markdown blockquote markers are treated. Done means copied text preserves the nested > structure instead of flattening quoted lines, while existing copy behavior remains intact.

I just encountered this case where I want to copy-paste hunks of the following out of a Claude Code session:

  Biggest copy regression: Tiling Layout

  This section lost its selling power. Previous version
   sold the use case:

  ▎ "Run builds, agents, servers, and scripts side by
  ▎ side. Minimize the ones you're not watching to a
  ▎ compact status indicator — every pane keeps running
  ▎  and every alert still fires whether minimized or
  ▎ not."

  Current version (lines 35–39) sells the mechanics:

  ▎ "You can spawn, layout, and relayout everything in
  ▎ the terminal using any of: default tmux shortcuts,
  ▎ intuitive modern shortcuts, the mouse"

  Readers on a marketplace decide based on "can I
  picture myself using this?" The old version paints
  that picture; the new version reads like a feature
  inventory. Also: the heading promises "Minimize /
  Maximize" but the body never mentions either — the
  feature claim is in the keyboard table only.

Here is what "Copy rewrapped" does right now:

Biggest copy regression: Tiling Layout

This section lost its selling power. Previous version sold the use case:

▎ "Run builds, agents, servers, and scripts side by ▎ side. Minimize the ones you're not watching to a ▎ compact status indicator — every pane keeps running ▎  and every alert still fires whether minimized or ▎ not."

Current version (lines 35–39) sells the mechanics:

▎ "You can spawn, layout, and relayout everything in ▎ the terminal using any of: default tmux shortcuts, ▎ intuitive modern shortcuts, the mouse"

Readers on a marketplace decide based on "can I picture myself using this?" The old version paints that picture; the new version reads like a feature inventory. Also: the heading promises "Minimize / Maximize" but the body never mentions either — the feature claim is in the keyboard table only.

Suggested direction: lead with the use case, then note that you can drive it with mouse/modern shortcuts/tmux shortcuts.

Should probably use the markdown > convention to deal with nesting like this.