refactor(nvim): modernize plugin stack

Removed dead weight:
- Drop nightfox, rose-pine, kanagawa, everforest colorschemes
- Remove fzf/fzf.vim (redundant with telescope)
- Remove vim-fugitive and its keymaps (lazygit covers this)
- Remove Comment.nvim (built into nvim 0.10+)

Replaced:
- nvim-cmp → blink.cmp (Rust-powered, faster, ghost text)
- none-ls/null-ls → conform.nvim (async, maintained)
- cmp-nvim-lsp capabilities → blink.cmp.get_lsp_capabilities()
- Copilot suggestions now routed through blink-copilot

Added:
- lazydev.nvim for proper Lua LSP in nvim config
- flash.nvim (s/S jump anywhere on screen)
- which-key.nvim (leader key popup with groups)
- snacks.nvim (notifier + word highlights)
- nvim-treesitter-textobjects (af/if, ac/ic, ]f/[f)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nvim/lua/plugins/init.lua

@@ -4,10 +4,6 @@ return {
     { "gruvbox-community/gruvbox", priority = 1000 },
     { "folke/tokyonight.nvim",     priority = 1000 },
     { "catppuccin/nvim",           name = "catppuccin", priority = 1000 },
-    { "EdenEast/nightfox.nvim",    priority = 1000 },
-    { "rose-pine/neovim",          name = "rose-pine",  priority = 1000 },
-    { "rebelot/kanagawa.nvim",     priority = 1000 },
-    { "sainnhe/everforest",        priority = 1000 },
 
 
     -- Auto-save
@@ -73,10 +69,6 @@ return {
             current_line_blame = false,
         }
     },
-    {
-        "tpope/vim-fugitive",
-        cmd = { "Git", "Gvdiffsplit" },
-    },
     {
         "kdheepak/lazygit.nvim",
         dependencies = { "nvim-lua/plenary.nvim" },
@@ -107,30 +99,70 @@ return {
                 right_alt = "",
                 space = " ",
             }
+            -- Tokyo Night Moon colors, transparent background
+            vim.g.tmuxline_theme = {
+                a    = { "#1e2030", "#82aaff" },
+                b    = { "#82aaff", "default" },
+                c    = { "#636da6", "default" },
+                x    = { "#636da6", "default" },
+                y    = { "#82aaff", "default" },
+                z    = { "#1e2030", "#82aaff" },
+                win  = { "#636da6", "default" },
+                cwin = { "#1e2030", "#c099ff" },
+                bg   = { "#636da6", "default" },
+            }
             vim.g.tmuxline_preset = {
-                a = "#S",
-                win = "#I #W",
+                a    = "#S",
+                win  = "#I #W",
                 cwin = "#I #W",
-                y = "%H:%M",
-                z = "%d %b",
+                y    = "%H:%M",
+                z    = "%d %b",
             }
         end,
     },
 
-    -- FZF
-    {
-        "junegunn/fzf",
-        build = function()
-            vim.fn["fzf#install"]()
-        end,
-    },
-    { "junegunn/fzf.vim" },
-
     -- Productivity
-    { "numToStr/Comment.nvim", event = "VeryLazy", opts = {} },
     { "windwp/nvim-autopairs", event = "InsertEnter", opts = {} },
     { "tpope/vim-surround",    event = "VeryLazy" },
 
+    -- Flash: jump anywhere with 2 chars (replaces f/t for long range)
+    {
+        "folke/flash.nvim",
+        event = "VeryLazy",
+        opts = {},
+        keys = {
+            { "s", mode = { "n", "x", "o" }, function() require("flash").jump() end,            desc = "Flash jump" },
+            { "S", mode = { "n", "x", "o" }, function() require("flash").treesitter() end,      desc = "Flash treesitter" },
+        },
+    },
+
+    -- Which-key: show available keybindings after leader
+    {
+        "folke/which-key.nvim",
+        event = "VeryLazy",
+        opts = {
+            spec = {
+                { "<leader>f", group = "find" },
+                { "<leader>g", group = "git" },
+                { "<leader>s", group = "split/spell" },
+                { "<leader>w", group = "write" },
+                { "<leader>d", group = "date" },
+                { "<leader>l", group = "lsp" },
+            },
+        },
+    },
+
+    -- Snacks: notifications + quality-of-life utilities
+    {
+        "folke/snacks.nvim",
+        priority = 1000,
+        lazy = false,
+        opts = {
+            notifier = { enabled = true },
+            words    = { enabled = true },
+        },
+    },
+
     -- -- Tmux navigation
     -- { "christoomey/vim-tmux-navigator" },