chore: remove local/unused plugins and refactor core configs

- Remove locally-developed or rarely-used plugin packages (codetyper, curls, edgy, flash) to reduce maintenance surface, external deps, and startup cost; these were local/optional and caused complexity.
- Clean up stale/keymap docs and small duplicate or experimental files (keymaps/README.md, sudoku keymaps).
- Apply targeted refactors to core modules for readability, robustness, and to align Java/DAP/Copilot integrations with local environment.
- Removed plugin modules:
  - lua/cargdev/plugins/codetyper.lua (deleted)
  - lua/cargdev/plugins/curls.lua (deleted)
  - lua/cargdev/plugins/edgy.lua (deleted)
  - lua/cargdev/plugins/flash.lua (deleted)
  - Added .codetyper to .gitignore
- Java / JDTLS:
  - ftplugin/java.lua: pin jdtls java executable to JDK 25, switch to mac_arm config, enable LSP formatter and declare multiple runtimes (JavaSE-17, JavaSE-25).
- Notifications & startup UX:
  - lua/cargdev/core/function/notification_manager.lua: large refactor — use local aliases (api, cmd, loop, opt), improved docs, dashboard-aware handling, nvim-notify fallback, safer tracking and cleanup of notifications.
- Utilities & monitors:
  - lua/cargdev/core/function/performance_monitor.lua: use local references, better notify usage and docs.
  - lua/cargdev/core/function/project_commands.lua: add docs, use local api/fn/notify, clearer RunProject/DebugProject commands.
- Terminal helper:
  - lua/cargdev/core/function/openTerminal.lua: add module docs and small refactor to use local cmd/api aliases and expose keymap.
- Keymaps & docs:
  - Removed stale keymaps README (lua/cargdev/core/keymaps/README.md).
  - Reworked many keymap files: docstrings, renamed/moved mappings to avoid conflicts, moved DAP mappings into dap plugin config, removed/disabled experimental mappings (see files under lua/cargdev/core/keymaps/*).
  - Adjusted quick keybindings and prefixes to reduce overlaps.
- Plugins & integrations:
  - lua/cargdev/plugins/formatting.lua: disabled google-java-format fallback for java (prefer JDTLS).
  - lua/cargdev/plugins/dap.lua: added additional DAP configs (Bun launch, attach helper), moved/registered dap keymaps here.
  - lua/cargdev/plugins/copilot.lua: reorganized Copilot/Copilot-cmp/CopilotChat config and added copilot source to nvim-cmp.
  - lua/cargdev/plugins/nvim-cmp.lua: added copilot source and small formatting tweak.

lua/cargdev/core/keymaps/window.lua

@@ -1,15 +1,24 @@
--- Window management keymaps
+--- Window and tab management keymaps.
+--- Provides split creation/closing, tab navigation, and Ctrl-based
+--- resize shortcuts for both vertical and horizontal splits.
+--- @module keymaps.window
+
 local keymap = vim.keymap
 
+--- Split management — vertical, horizontal, equalize, and close.
 keymap.set("n", "<leader>sv", "<C-w>v", { desc = "Split window vertically" })
 keymap.set("n", "<leader>sh", "<C-w>s", { desc = "Split window horizontally" })
 keymap.set("n", "<leader>se", "<C-w>=", { desc = "Make splits equal size" })
 keymap.set("n", "<leader>sx", "<cmd>close<CR>", { desc = "Close current split" })
+
+--- Tab management — new, close, next, previous, and open buffer in new tab.
 keymap.set("n", "<leader>to", "<cmd>tabnew<CR>", { desc = "Open new tab" })
-keymap.set("n", "<leader>tx", "<cmd>tabclose<CR>", { desc = "Close current tab" })
+keymap.set("n", "<leader>cx", "<cmd>tabclose<CR>", { desc = "Close current tab" })
 keymap.set("n", "<leader>tn", "<cmd>tabn<CR>", { desc = "Go to next tab" })
 keymap.set("n", "<leader>tp", "<cmd>tabp<CR>", { desc = "Go to previous tab" })
-keymap.set("n", "<leader>tf", "<cmd>tabnew %<CR>", { desc = "Open current buffer in new tab" })
+keymap.set("n", "<leader>tt", "<cmd>tabnew %<CR>", { desc = "Open current buffer in new tab" })
+
+--- Resize splits — Ctrl+H/L for width, Ctrl+K/J for height (step of 5).
 keymap.set("n", "<C-l>", ":vertical resize -5<CR>", { noremap = true, silent = true })
 keymap.set("n", "<C-h>", ":vertical resize +5<CR>", { noremap = true, silent = true })
 keymap.set("n", "<C-k>", ":resize +5<CR>", { noremap = true, silent = true })