rename the selection search binding, unify into start_search action

src/input/Binding.zig

@@ -368,8 +368,10 @@ pub const Action = union(enum) {
     /// If a previous search is active, it is replaced.
     search: []const u8,
 
-    /// Input the selected text into the search field.
-    selection_for_search,
+    /// Start a search for the current text selection. If there is no
+    /// selection, this does nothing. If a search is already active, this
+    /// changes the search terms.
+    search_selection,
 
     /// Navigate the search results. If there is no active search, this
     /// is not performed.
@@ -1287,7 +1289,7 @@ pub const Action = union(enum) {
             .cursor_key,
             .search,
             .navigate_search,
-            .selection_for_search,
+            .search_selection,
             .start_search,
             .end_search,
             .reset,

src/input/command.zig

@@ -189,10 +189,10 @@ fn actionCommands(action: Action.Key) []const Command {
             .description = "Start a search if one isn't already active.",
         }},
 
-        .selection_for_search => comptime &.{.{
-            .action = .selection_for_search,
-            .title = "Selection for Search",
-            .description = "Input the selected text into the search field.",
+        .search_selection => comptime &.{.{
+            .action = .search_selection,
+            .title = "Search Selection",
+            .description = "Start a search for the current text selection.",
         }},
 
         .end_search => comptime &.{.{