add git source control integration with gitsigns and diffview

Adds gitsigns.nvim for inline git signs and hunk operations,
diffview.nvim for side-by-side diffs, and Telescope git pickers
under the <leader>g namespace.

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

lazy-lock.json

@@ -6,7 +6,9 @@
   "cmp-path": { "branch": "main", "commit": "c642487086dbd9a93160e1679a1327be111cbc25" },
   "cmp_luasnip": { "branch": "master", "commit": "98d9cb5c2c38532bd9bdb481067b20fea8f32e90" },
   "conform.nvim": { "branch": "master", "commit": "235dd79731c1dc51ec04abb4045cbc54727a172a" },
+  "diffview.nvim": { "branch": "main", "commit": "4516612fe98ff56ae0415a259ff6361a89419b0a" },
   "friendly-snippets": { "branch": "main", "commit": "572f5660cf05f8cd8834e096d7b4c921ba18e175" },
+  "gitsigns.nvim": { "branch": "main", "commit": "42d6aed4e94e0f0bbced16bbdcc42f57673bd75e" },
   "kanagawa": { "branch": "master", "commit": "aef7f5cec0a40dbe7f3304214850c472e2264b10" },
   "lazy.nvim": { "branch": "main", "commit": "1ea3c4085785f460fb0e46d2fe1ee895f5f9e7c1" },
   "lualine.nvim": { "branch": "master", "commit": "3946f0122255bc377d14a59b27b609fb3ab25768" },

lua/core/keymaps.lua

@@ -9,6 +9,12 @@ keymap('n', '<leader>ff', '<cmd>Telescope find_files<cr>', { desc = "Find files"
 keymap('n', '<leader>fg', '<cmd>Telescope live_grep<cr>', { desc = "Live grep" })
 keymap('n', '<leader>fb', '<cmd>Telescope buffers<cr>', { desc = "Find buffers" })
 
+-- Git (Telescope pickers)
+keymap('n', '<leader>gt', '<cmd>Telescope git_status<cr>', { desc = "Git status" })
+keymap('n', '<leader>gc', '<cmd>Telescope git_commits<cr>', { desc = "Git commits" })
+keymap('n', '<leader>gf', '<cmd>Telescope git_bcommits<cr>', { desc = "File commits" })
+keymap('n', '<leader>gw', '<cmd>Telescope git_branches<cr>', { desc = "Git branches" })
+
 -- Better window navigation
 keymap('n', '<C-h>', '<C-w>h')
 keymap('n', '<C-j>', '<C-w>j')

lua/plugins/plugin.lua

@@ -42,6 +42,47 @@ return {
         end,
     },
 
+    -- Git signs
+    {
+        "lewis6991/gitsigns.nvim",
+        event = { "BufReadPre", "BufNewFile" },
+        config = function()
+            require("gitsigns").setup({
+                on_attach = function(bufnr)
+                    local gs = package.loaded.gitsigns
+                    local map = function(mode, l, r, opts)
+                        opts = opts or {}
+                        opts.buffer = bufnr
+                        vim.keymap.set(mode, l, r, opts)
+                    end
+                    -- Navigation
+                    map("n", "]c", function() gs.next_hunk() end, { desc = "Next hunk" })
+                    map("n", "[c", function() gs.prev_hunk() end, { desc = "Previous hunk" })
+                    -- Actions
+                    map("n", "<leader>gs", gs.stage_hunk, { desc = "Stage hunk" })
+                    map("n", "<leader>gr", gs.reset_hunk, { desc = "Reset hunk" })
+                    map("n", "<leader>gS", gs.stage_buffer, { desc = "Stage buffer" })
+                    map("n", "<leader>gu", gs.undo_stage_hunk, { desc = "Undo stage" })
+                    map("n", "<leader>gp", gs.preview_hunk, { desc = "Preview hunk" })
+                    map("n", "<leader>gb", function() gs.blame_line({ full = true }) end, { desc = "Blame line" })
+                    map("n", "<leader>gd", gs.diffthis, { desc = "Diff this" })
+                end,
+            })
+        end,
+    },
+
+    -- Diff view
+    {
+        "sindrets/diffview.nvim",
+        cmd = { "DiffviewOpen", "DiffviewFileHistory" },
+        keys = {
+            { "<leader>gv", "<cmd>DiffviewOpen<cr>", desc = "Diff view" },
+            { "<leader>gh", "<cmd>DiffviewFileHistory %<cr>", desc = "File history" },
+            { "<leader>gx", "<cmd>DiffviewClose<cr>", desc = "Close diff" },
+        },
+        config = true,
+    },
+
     -- Fuzzy finder
     {
         "nvim-telescope/telescope.nvim",
@@ -190,6 +231,7 @@ return {
                 { "<leader>ff", desc = "Find files" },
                 { "<leader>fg", desc = "Live grep" },
                 { "<leader>fb", desc = "Find buffers" },
+                { "<leader>g",  group = "Git" },
                 { "<leader>w",  desc = "Save" },
                 { "<leader>q",  desc = "Quit" },
             })