nvim: Add mapping to flash.nvim current word

Use <S> to jump to any word that is the same as the current word under
the cursor using flash.

Moved the previous flash treesitter binding and updated it to
`treesitter_search` so any word in the current buffer view can be used
as starting point for a tresitter-based selection. Mapping moved to <R>
as is (somewhat) mimics the <yr...> remote-based mappings for flash.

nvim/.config/nvim/lua/modules/editing.lua

@@ -24,11 +24,13 @@ return {
 			},
 			{
 				"S",
-				mode = { "n", "x", "o" },
+				mode = { "n", "x" },
 				function()
-					require("flash").treesitter()
+					require("flash").jump({
+						pattern = vim.fn.expand("<cword>"),
+					})
 				end,
-				desc = "Flash Treesitter",
+				desc = "Flash",
 			},
 			{
 				"r",
@@ -38,6 +40,14 @@ return {
 				end,
 				desc = "Remote Flash",
 			},
+			{
+				"R",
+				mode = { "n", "x", "o" },
+				function()
+					require("flash").treesitter_search()
+				end,
+				desc = "Flash Treesitter",
+			},
 		},
 	},
 	-- extend the ^x / ^a possibilities to dates, hex, alphabets, markdown headers