feat(git): add gitsigns hunk keymaps, drop diffview

Gitsigns was configured with sign glyphs and no bindings at all, so
hunks were visible but not navigable — the main thing you do when
reading back what an agent changed. Adds ]c/[c, preview, reset, blame
and diffthis, buffer-local on attach.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lazy-lock.json

@@ -10,7 +10,6 @@
   "cmp-nvim-lua": { "branch": "main", "commit": "e3a22cb071eb9d6508a156306b102c45cd2d573d" },
   "cmp_luasnip": { "branch": "master", "commit": "98d9cb5c2c38532bd9bdb481067b20fea8f32e90" },
   "conform.nvim": { "branch": "master", "commit": "619363c30309d29ffa631e67c8183f2a72caa373" },
-  "diffview.nvim": { "branch": "main", "commit": "4516612fe98ff56ae0415a259ff6361a89419b0a" },
   "friendly-snippets": { "branch": "main", "commit": "6cd7280adead7f586db6fccbd15d2cac7e2188b9" },
   "fzf-lua": { "branch": "main", "commit": "988416cc782dfe28bff3f0da9b8c943b236cd86a" },
   "git-conflict.nvim": { "branch": "main", "commit": "a1badcd070d176172940eb55d9d59029dad1c5a6" },

lua/plugins/git.lua

@@ -4,7 +4,6 @@ return {
     cmd = "Neogit",
     dependencies = {
       "nvim-lua/plenary.nvim", -- required
-      "sindrets/diffview.nvim", -- optional - Diff integration
       "ibhagwan/fzf-lua", -- optional - picker
     },
     config = true,
@@ -14,17 +13,39 @@ return {
   },
 
   {
-    "sindrets/diffview.nvim",
-    event = "VeryLazy",
-    dependencies = "nvim-lua/plenary.nvim",
-    opts = {
-      enhanced_diff_hl = true,
-      file_panel = {
-        win_config = {
-          width = 25,
-        },
-      },
-    },
+    "lewis6991/gitsigns.nvim",
+    opts = function(_, opts)
+      opts.on_attach = function(bufnr)
+        local gs = require "gitsigns"
+
+        local function map(mode, lhs, rhs, desc)
+          vim.keymap.set(mode, lhs, rhs, { buffer = bufnr, desc = "Gitsigns " .. desc })
+        end
+
+        -- ]c/[c belong to vim's builtin diff navigation while the window is in diff mode
+        map("n", "]c", function()
+          if vim.wo.diff then
+            vim.cmd.normal { "]c", bang = true }
+          else
+            gs.nav_hunk "next"
+          end
+        end, "next hunk")
+
+        map("n", "[c", function()
+          if vim.wo.diff then
+            vim.cmd.normal { "[c", bang = true }
+          else
+            gs.nav_hunk "prev"
+          end
+        end, "prev hunk")
+
+        map("n", "<leader>hp", gs.preview_hunk, "preview hunk")
+        map("n", "<leader>hb", gs.blame_line, "blame line")
+        map("n", "<leader>hd", gs.diffthis, "diff against index")
+        map({ "n", "v" }, "<leader>hr", gs.reset_hunk, "reset hunk")
+      end
+      return opts
+    end,
   },
 
   { "akinsho/git-conflict.nvim", event = "VeryLazy", config = true },