feat(lua): add flash.nvim plugin for enhanced motions and labeled jumps

lua/plugins/flash.lua

@@ -0,0 +1,37 @@
+--- flash.nvim: labeled jumps and enhanced motions
+---@type LazySpec
+return {
+  "folke/flash.nvim",
+  event = "VeryLazy",
+  ---@type Flash.Config
+  opts = {
+    modes = {
+      char = {
+        -- normal-mode `f` is the Vimium-style word jump below, so flash's
+        -- char mode must not rebind it; F/t/T/;/, stay enhanced
+        keys = { "F", "t", "T", ";", "," },
+      },
+    },
+  },
+  keys = {
+    {
+      "f",
+      mode = "n",
+      function()
+        -- Vimium-c style: label every visible word start immediately,
+        -- press a label to jump (no search pattern typed)
+        require("flash").jump {
+          search = { mode = "search", max_length = 0 },
+          label = { after = false, before = { 0, 0 } },
+          pattern = [[\<]],
+        }
+      end,
+      desc = "Jump to word (Vimium-style)",
+    },
+    { "s", mode = { "n", "x", "o" }, function() require("flash").jump() end, desc = "Flash" },
+    { "S", mode = { "n", "x", "o" }, function() require("flash").treesitter() end, desc = "Flash Treesitter" },
+    { "r", mode = "o", function() require("flash").remote() end, desc = "Remote Flash" },
+    { "R", mode = { "o", "x" }, function() require("flash").treesitter_search() end, desc = "Treesitter Search" },
+    { "<c-s>", mode = { "c" }, function() require("flash").toggle() end, desc = "Toggle Flash Search" },
+  },
+}