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/windows.nix

@@ -0,0 +1,110 @@
+{...}: {
+  keymaps = [
+    # Window namespace indicator for whichkey
+    {
+      mode = ["n"];
+      key = "<leader>w";
+      action = "<NOP>";
+      options = {
+        desc = "+window";
+      };
+    }
+
+    # Window splits
+    {
+      mode = ["n"];
+      key = "<leader>ws";
+      action = "<C-w>s";
+      options = {
+        desc = "Split window horizontally";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>wv";
+      action = "<C-w>v";
+      options = {
+        desc = "Split window vertically";
+        silent = true;
+      };
+    }
+
+    # Window closing
+    {
+      mode = ["n"];
+      key = "<leader>wq";
+      action = "<C-w>q";
+      options = {
+        desc = "Quit window";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<leader>wQ";
+      action = "<C-w>o";
+      options = {
+        desc = "Quit all other windows";
+        silent = true;
+      };
+    }
+
+    # Window maximize
+    {
+      mode = ["n"];
+      key = "<leader>wm";
+      action = {
+        __raw = "require('maximize').toggle";
+      };
+      options = {
+        desc = "Toggle maximize window";
+        silent = true;
+      };
+    }
+
+    # Cycle through splits
+    {
+      mode = ["n"];
+      key = "<C-Up>";
+      action = "<C-w>W";
+      options = {
+        desc = "Cycle to previous split";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<C-Down>";
+      action = "<C-w>w";
+      options = {
+        desc = "Cycle to next split";
+        silent = true;
+      };
+    }
+
+    # Rotate split layout
+    {
+      mode = ["n"];
+      key = "<C-PageUp>";
+      action = "<C-w>R";
+      options = {
+        desc = "Rotate splits counter-clockwise";
+        silent = true;
+      };
+    }
+
+    {
+      mode = ["n"];
+      key = "<C-PageDown>";
+      action = "<C-w>r";
+      options = {
+        desc = "Rotate splits clockwise";
+        silent = true;
+      };
+    }
+  ];
+}