feat(ui): modernize nvim with fzf-lua, snacks dashboard, and p10k-style statusline

- Replace Snacks picker with fzf-lua for LSP navigation (gd, gr, gi, gt)
- Add fzf-lua plugin with LSP-optimized settings
- Fix Mason inconsistencies (add eslint, gopls to ensure_installed)
- Replace alpha-nvim with Snacks dashboard (shared config)
- Create dashboard_config.lua for DRY dashboard settings
- Modernize lualine with p10k-rainbow style and solid backgrounds
- Enhance bufferline with LSP diagnostics and modern styling
- Update noice with centered cmdline/search and modern icons
- Add global rounded borders for floating windows
- Improve indent-blankline with scope highlighting
- Add return-to-dashboard on last buffer close
- Create performance_monitor module

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lua/cargdev/plugins/alpha.lua

@@ -1,56 +1,24 @@
 return {
   "goolord/alpha-nvim",
   event = "VimEnter",
-  enabled = true,
+  enabled = false, -- Replaced by Snacks dashboard
   config = function()
     local alpha = require("alpha")
     local dashboard = require("alpha.themes.dashboard")
+    local config = require("cargdev.core.dashboard_config")
 
-    -- 🚀 Set header
-    dashboard.section.header.val = {
-      "  ██████╗ █████╗ ██████╗  ██████╗ ██████╗ ███████╗██╗   ██╗ ",
-      "  █╔════╝██╔══██╗██╔══██╗██╔════╝ ██╔══██╗██╔════╝██║   ██║ ",
-      "  █║     ███████║██████╔╝██║  ███╗██║  ██║█████╗  ██║   ██║ ",
-      "  █║     ██╔══██║██╔══██╗██║   ██║██║  ██║██╔══╝  ╚██╗ ██╔╝ ",
-      "  ██████╗██║  ██║██║  ██║╚██████╔╝██████╔╝███████╗ ╚████╔╝  ",
-      "  ╚═════╝╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝ ╚═════╝ ╚══════╝  ╚═══╝   ",
-      "                                                     ",
-      "                                                     ",
-      "  ███╗   ██╗███████╗ ██████╗ ██╗   ██╗██╗███╗   ███╗ ",
-      "  ████╗  ██║██╔════╝██╔═══██╗██║   ██║██║████╗ ████║ ",
-      "  ██╔██╗ ██║█████╗  ██║   ██║██║   ██║██║██╔████╔██╗ ",
-      "  ██║╚██╗██║██╔══╝  ██║   ██║╚██╗ ██╔╝██║██║╚██╔╝██║ ",
-      "  ██║ ╚████║███████╗╚██████╔╝ ╚████╔╝ ██║██║ ╚═╝ ██║ ",
-      "  ╚═╝  ╚═══╝╚══════╝ ╚═════╝   ╚═══╝  ╚═╝╚═╝     ╚═╝ ",
-      "                                                     ",
-      "                                                     ",
-      "  🚀 Welcome to CarGDev Neovim - Customize Your Flow! 🚀  ",
-    }
+    -- Set header from shared config
+    dashboard.section.header.val = config.header
 
-    -- 📂 Set menu with improved icons and performance tools
-    dashboard.section.buttons.val = {
-      dashboard.button("f", "🔎  Find File (Safe)", "<cmd>Telescope find_files<CR>"),
-      dashboard.button("n", "📄  New File", "<cmd>ene<CR>"),
-      dashboard.button("g", "📝  Find Text", "<cmd>Telescope live_grep<CR>"),
-      dashboard.button("r", "📚  Recent Files", "<cmd>Telescope oldfiles<CR>"),
-      dashboard.button("t", "🌳  File Tree", "<cmd>NvimTreeToggle<CR>"),
-      dashboard.button("c", "⚙️  Config", "<cmd>e ~/.config/nvim/init.lua<CR>"),
-      dashboard.button("L", "🦥  Lazy", "<cmd>Lazy<CR>"),
-      dashboard.button("p", "📊  Performance", "<cmd>lua require('cargdev.core.function.performance_monitor').check_performance()<CR>"),
-      dashboard.button("l", "🔧  LSP Health", "<cmd>lua require('cargdev.core.function.performance_monitor').check_lsp_health()<CR>"),
-      dashboard.button("s", "🧩  Sudoku", "<cmd>Sudoku<CR>"),
-      dashboard.button("e", "💻  LeetCode", "<cmd>Leet<CR>"),
-      dashboard.button("m", "🔨  Mason", "<cmd>Mason<CR>"),
-      dashboard.button("q", "🚪  Quit", "<cmd>qa<CR>"),
-    }
+    -- Set menu from shared config
+    dashboard.section.buttons.val = config.get_alpha_buttons(dashboard)
 
-    -- 🎯 Function to center text within a width
+    -- Footer with fortune
     local function center_text(text, width)
       local padding = math.floor((width - #text) / 2)
       return padding > 0 and string.rep(" ", padding) .. text or text
     end
 
-    -- 📌 Function to wrap text at a specific width
     local function wrap_text(text, width)
       local wrapped_lines = {}
       for line in text:gmatch("[^\n]+") do
@@ -64,48 +32,19 @@ return {
       return wrapped_lines
     end
 
-    -- 🖥 Set viewport width (adjust if necessary)
     local viewport_width = 50
-
-    -- 📝 Get a fortune quote and wrap it
     local handle = io.popen("fortune")
-    local quote = handle and handle:read("*a") or "💻 Code, Create, Conquer with CarGDev 🚀"
-    if handle then
-      handle:close()
-    end
+    local quote = handle and handle:read("*a") or "Code, Create, Conquer with CarGDev"
+    if handle then handle:close() end
     local wrapped_quote = wrap_text(quote:gsub("\n", " "), viewport_width)
 
-    -- 📝 Set the footer content with added spacing
-    dashboard.section.footer.val = {
-      "",
-      center_text("🔧  CarGDev - Innovating with Neovim! 🔧", viewport_width),
-      "",
-    }
-
-    -- Add wrapped quote below separator
+    dashboard.section.footer.val = { "", center_text("CarGDev - Innovating with Neovim!", viewport_width), "" }
     for _, line in ipairs(wrapped_quote) do
       table.insert(dashboard.section.footer.val, line)
     end
 
-    -- Add branding line at the bottom
-    table.insert(dashboard.section.footer.val, "")
-    table.insert(
-      dashboard.section.footer.val,
-      center_text("🎯 Stay productive & code with passion! 🚀", viewport_width)
-    )
-    table.insert(dashboard.section.footer.val, "")
-
-    -- 🌈 Apply modern styling
-    dashboard.opts.opts = {
-      position = "center",
-      hl = "Statement",
-      spacing = 2,
-    }
-
-    -- 🚀 Load dashboard config
+    dashboard.opts.opts = { position = "center", hl = "Statement", spacing = 2 }
     alpha.setup(dashboard.opts)
-
-    -- 🔥 Disable folding on alpha buffer
     vim.cmd([[autocmd FileType alpha setlocal nofoldenable]])
   end,
 }