chore(lua/plugins): cleanup and reorganize plugin configurations, dropping deprecated plugins and introducing new folding, smoothing, and screenshot tools

New Features:
- Added ufo.nvim for advanced folding with Treesitter and indent providers
- Added neoscroll.nvim for smooth scrolling
- Added smartcolumn.nvim to enforce colorcolumn only when needed
- Added codesnap.nvim for markdown screenshot generation
- Added Markview toggle shortcut for markdown preview

Enhancements:
- Configured folding options (foldcolumn, foldlevel, provider selector)
- Added keybindings for opening/closing all folds and toggling fold visibility
- Updated plugin loading conditions and lazy loading patterns

Bug Fixes: — No bug fixes included in this change —

lua/plugins/git.lua

@@ -0,0 +1,61 @@
+return {
+    -- gitignore generator
+    {
+        'wintermute-cell/gitignore.nvim',
+        cmd = { 'Gitignore' },
+        opts = {},
+    },
+
+    -- git signs
+    {
+        'lewis6991/gitsigns.nvim',
+        events = { 'BufReadPost', 'BufNewFile' },
+        opts = {
+            signcolumn = true,
+            current_line_blame = true,
+            attach_to_untracked = false,
+            current_line_blame_formatter = '<author>, <author_time:%R> - <summary>',
+            watch_gitdir = {
+                follow_files = true,
+            },
+            current_line_blame_opts = {
+                virt_text = true,
+                virt_text_pos = 'eol', -- 'eol' | 'overlay' | 'right_align'
+                delay = 1000,
+                ignore_whitespace = false,
+                virt_text_priority = 100,
+                use_focus = true,
+            },
+            signs = {
+                add = { text = ' ' },
+                change = { text = '󱗜 ' },
+                delete = { text = '󰍵 ' },
+                topdelete = { text = '󱥨 ' },
+                changedelete = { text = '󰾟 ' },
+                untracked = { text = '󰰧 ' },
+            },
+        },
+    },
+
+    -- lazygit integration
+    {
+        'kdheepak/lazygit.nvim',
+        lazy = true,
+        enabled = true,
+        cmd = {
+            'LazyGit',
+            'LazyGitConfig',
+            'LazyGitCurrentFile',
+            'LazyGitFilter',
+            'LazyGitFilterCurrentFile',
+        },
+        keys = {
+            { '<leader>lg', '<cmd>LazyGit<cr>', desc = 'LazyGit' },
+        },
+        config = function()
+            vim.g.lazygit_floating_window_winblend = 0
+            vim.g.lazygit_floating_window_scaling_factor = 0.9
+            vim.g.lazygit_floating_window_border_chars = { '╭', '─', '╮', '│', '╯', '─', '╰', '│' }
+        end,
+    },
+}