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/indent-blankline.lua

@@ -2,17 +2,61 @@ return {
   "lukas-reineke/indent-blankline.nvim",
   event = { "BufReadPre", "BufNewFile" },
   main = "ibl",
-  opts = {
-    indent = { 
-      char = "┊",
-    },
-    exclude = {
-      filetypes = { "help", "alpha", "dashboard", "neo-tree", "Trouble", "lazy", "mason" },
-      buftypes = { "terminal", "nofile", "quickfix", "prompt" },
-    },
-    scope = { 
-      enabled = false 
-    },
-  },
-}
+  config = function()
+    local hooks = require("ibl.hooks")
 
+    -- Rainbow indent colors (subtle)
+    hooks.register(hooks.type.HIGHLIGHT_SETUP, function()
+      vim.api.nvim_set_hl(0, "IblIndent", { fg = "#292e42" })
+      vim.api.nvim_set_hl(0, "IblScope", { fg = "#7aa2f7" })
+      vim.api.nvim_set_hl(0, "RainbowRed", { fg = "#3b3052" })
+      vim.api.nvim_set_hl(0, "RainbowYellow", { fg = "#3b3939" })
+      vim.api.nvim_set_hl(0, "RainbowBlue", { fg = "#2a3a52" })
+      vim.api.nvim_set_hl(0, "RainbowOrange", { fg = "#3b3339" })
+      vim.api.nvim_set_hl(0, "RainbowGreen", { fg = "#2a3b39" })
+      vim.api.nvim_set_hl(0, "RainbowViolet", { fg = "#3a2a52" })
+      vim.api.nvim_set_hl(0, "RainbowCyan", { fg = "#2a3b4a" })
+    end)
+
+    require("ibl").setup({
+      indent = {
+        char = "│",
+        tab_char = "│",
+        highlight = "IblIndent",
+      },
+      scope = {
+        enabled = true,
+        show_start = false,
+        show_end = false,
+        highlight = "IblScope",
+        include = {
+          node_type = {
+            ["*"] = { "return_statement", "table_constructor" },
+            lua = { "return_statement", "table_constructor", "function", "if_statement" },
+            python = { "function_definition", "class_definition", "if_statement", "for_statement" },
+            javascript = { "function_declaration", "arrow_function", "if_statement", "for_statement" },
+            typescript = { "function_declaration", "arrow_function", "if_statement", "for_statement" },
+          },
+        },
+      },
+      exclude = {
+        filetypes = {
+          "help",
+          "alpha",
+          "dashboard",
+          "snacks_dashboard",
+          "neo-tree",
+          "NvimTree",
+          "Trouble",
+          "trouble",
+          "lazy",
+          "mason",
+          "notify",
+          "toggleterm",
+          "lazyterm",
+        },
+        buftypes = { "terminal", "nofile", "quickfix", "prompt" },
+      },
+    })
+  end,
+}