Hard restore with X drops staged pins at every depth

X restores the selection to the committed pins without the staged or
committed question, and resets every restored repository's index to
HEAD, so staged pins below are dropped too. Dropped staged pins alone
don't make it ask; they are listed if something else is lost.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/requirements.md

@@ -148,6 +148,10 @@ commit hashes. It doesn't answer the questions users actually have:
   staged or the committed pin (the latter unstages it). A restored submodule
   whose pin is a branch tip ends on that branch, not detached. It asks for
   confirmation only if something would be lost. See [actions.md](actions.md#restore).
+  `X` is a hard restore: it goes to the committed pins at every depth,
+  without the pin question, and drops all staged pins below the selection
+  too. Dropped staged pins alone don't make it ask. See
+  [actions.md](actions.md#hard-restore).
 
 - **F57** `b` opens a popup in the middle of the screen with a search line
   and the local and remote branches of the selection (a submodule, or the