feat(picker): add git_restore action for git_status picker

Adds a git_restore action that discards changes to files in the
git_status picker. Includes confirmation prompt before discarding
changes to prevent accidental data loss.

Usage:
- `<C-r>` in git_status picker to restore selected file(s)
- Works with multi-select (select multiple files and restore all)
- Shows different confirmation messages for single vs multiple files

Implementation:
- Added git_restore() action in actions.lua
- Bound to <C-r> in git_status picker
- Supports both single and multi-select
- Uses Snacks.picker.select for confirmation
- Refreshes picker and returns to insert mode after restore

Closes #2298

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lua/snacks/picker/actions.lua

@@ -349,6 +349,42 @@ function M.git_stage(picker)
   end
 end
 
+function M.git_restore(picker)
+  local items = picker:selected({ fallback = true })
+  if #items == 0 then
+    return
+  end
+
+  -- Confirm before discarding changes
+  ---@param item snacks.picker.Item
+  local files = vim.tbl_map(function(item)
+    return Snacks.picker.util.path(item)
+  end, items)
+  local msg = #items == 1 and ("Discard changes to `%s`?"):format(files[1])
+    or ("Discard changes to %d files?"):format(#items)
+
+  Snacks.picker.select({ "No", "Yes" }, { prompt = msg }, function(_, idx)
+    if not idx and idx == 2 then
+      return
+    end
+    local done = 0
+    for _, item in ipairs(items) do
+      local cmd = { "git", "restore", item.file }
+      Snacks.picker.util.cmd(cmd, function(data, code)
+        done = done + 1
+        if done == #items then
+          vim.schedule(function()
+            picker.list:set_selected()
+            picker.list:set_target()
+            picker:find()
+            vim.cmd.startinsert()
+          end)
+        end
+      end, { cwd = item.cwd })
+    end
+  end)
+end
+
 function M.git_stash_apply(_, item)
   if not item then
     return

lua/snacks/picker/config/sources.lua

@@ -321,6 +321,7 @@ M.git_status = {
     input = {
       keys = {
         ["<Tab>"] = { "git_stage", mode = { "n", "i" } },
+        ["<c-r>"] = { "git_restore", mode = { "n", "i" } },
       },
     },
   },