refactor: reorganize keymaps into semantic namespaces

Restructure keybindings for improved discoverability and consistency
with WezTerm/XMonad configurations. Separate keymaps from plugin
configurations following single responsibility principle.

Changes:
- Create keymaps/ directory with semantic grouping:
  - general.nix: leader setup, page navigation
  - buffers.nix: buffer operations (bq, bQ, bl)
  - windows.nix: window operations (ws, wv, wq, wQ, wm)
  - find.nix: telescope find operations (ff, fg, fh, fc)
  - git.nix: unified git operations from gitsigns/fugitive/telescope

- Adopt consistent q/Q pattern across containers:
  - bq/bQ for buffer quit (current/all others)
  - wq/wQ for window quit (current/all others)
  - Mirrors WezTerm's LEADER+p q / LEADER+t q pattern

- Extract keymaps from plugin files:
  - telescope.nix: config only, keymaps moved to find.nix
  - fugitive.nix: config only, keymaps moved to git.nix
  - gitsigns.nix: config only, keymaps moved to git.nix
  - snacks.nix: config only, keymaps moved to buffers.nix
  - maximize.nix: config only, keymap moved to windows.nix

- Remove smart-splits.nix (functionality replaced by native window ops)

- Maintain navigation on dedicated modifiers (Ctrl+arrows/PageUp/PageDown)
  for consistency with WezTerm (ALT) and XMonad (Super)

config/keymaps/git.nix

@@ -0,0 +1,181 @@
+{...}: {
+  keymaps = [
+    # Git namespace indicator for whichkey
+    {
+      mode = ["n"];
+      key = "<leader>g";
+      action = "<NOP>";
+      options = {
+        desc = "+git";
+      };
+    }
+
+    # Git list namespace indicator for whichkey
+    {
+      mode = ["n"];
+      key = "<leader>gl";
+      action = "<NOP>";
+      options = {
+        desc = "+list";
+      };
+    }
+
+    # Git staging (from gitsigns)
+    {
+      mode = ["n" "v"];
+      key = "<leader>gs";
+      action = "<cmd>Gitsigns stage_hunk<CR>";
+      options = {
+        desc = "Stage hunk";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>gS";
+      action = "<cmd>Gitsigns stage_buffer<CR>";
+      options = {
+        desc = "Stage buffer";
+        silent = true;
+      };
+    }
+
+    # Git reset (from gitsigns)
+    {
+      mode = ["n" "v"];
+      key = "<leader>gr";
+      action = "<cmd>Gitsigns reset_hunk<CR>";
+      options = {
+        desc = "Reset hunk";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>gR";
+      action = "<cmd>Gitsigns reset_buffer<CR>";
+      options = {
+        desc = "Reset buffer";
+        silent = true;
+      };
+    }
+
+    # Git blame (from gitsigns)
+    {
+      mode = ["n"];
+      key = "<leader>gb";
+      action = "<cmd>Gitsigns toggle_current_line_blame<CR>";
+      options = {
+        desc = "Toggle blame";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>gB";
+      action = "<cmd>Gitsigns blame<CR>";
+      options = {
+        desc = "View blame";
+        silent = true;
+      };
+    }
+
+    # Git commit (from fugitive)
+    {
+      mode = ["n"];
+      key = "<leader>gc";
+      action = "<cmd>Git commit<CR>";
+      options = {
+        desc = "Commit changes";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>gC";
+      action = "<cmd>Git commit --amend<CR>";
+      options = {
+        desc = "Amend changes";
+        silent = true;
+      };
+    }
+
+    # Git diff (from fugitive)
+    {
+      mode = ["n"];
+      key = "<leader>gd";
+      action = "<cmd>Git diff<CR>";
+      options = {
+        desc = "View diff";
+        silent = true;
+      };
+    }
+
+    # Git unstage (from fugitive)
+    {
+      mode = ["n"];
+      key = "<leader>gu";
+      action = "<cmd>Git restore --staged .<CR>";
+      options = {
+        desc = "Unstage all changes";
+        silent = true;
+      };
+    }
+
+    # Git push (from fugitive)
+    {
+      mode = ["n"];
+      key = "<leader>gp";
+      action = "<cmd>Git push<CR>";
+      options = {
+        desc = "Push changes to remote";
+        silent = true;
+      };
+    }
+
+    # Git list operations (from telescope)
+    {
+      mode = ["n"];
+      key = "<leader>glc";
+      action = "<cmd>Telescope git_commits<CR>";
+      options = {
+        desc = "List git commits";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>glb";
+      action = "<cmd>Telescope git_branches<CR>";
+      options = {
+        desc = "List git branches";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>gld";
+      action = "<cmd>Telescope git_status<CR>";
+      options = {
+        desc = "List git diff";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>gls";
+      action = "<cmd>Telescope git_stash<CR>";
+      options = {
+        desc = "List git stash";
+        silent = true;
+      };
+    }
+  ];
+}