feat: add new plugins, refactor options, and improve blink.cmp detection

- Add focusline.nvim for scroll-aware cursor centering
- Add kitty-scrollback.nvim for Kitty terminal scrollback integration
- Add qalc.nvim for inline calculator support
- Add blink.lib as explicit dependency for blink.cmp
- Fix blink.cmp binary detection to check v2 install path first
- Add PackChanged autocmd to auto-rebuild blink.cmp after updates
- Expand inc-rename.nvim config with all available options documented
- Add luv library path to lazydev for vim.uv completions
- Consolidate leader key setup into options.lua (remove duplicate in init.lua)
- Add autoread + FocusGained/CursorHold triggers for external file changes
- Add BufReadPost autocmd to restore last cursor position on file open
- Reorganize options.lua with section headers and logical grouping
- Update plugin lockfile revisions (blink.cmp, conform, gitsigns, lualine, etc.)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

init.lua

@@ -19,27 +19,23 @@
 -- You should have received a copy of the GNU General Public License
 -- along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
--- Set leader keys before loading any plugins
-vim.g.mapleader = " "
-vim.g.maplocalleader = " "
-
 -- Initialize global registry
 _G.Config = {
-  plugins = {},
-  called = {},
+	plugins = {},
+	called = {},
 }
 
 -- Load core modules
-require('lazyload')
-require('options')
-require('plugins')
-require('keymaps')
+require("lazyload") -- Plugin lazy-loading module
+require("options")  -- Configuration options
+require("plugins")  -- Plugin specifications and setup
+require("keymaps")  -- Key mappings
 
 -- Source machine-local and secret overrides (silently ignored if absent)
 local user_dots = vim.fn.expand("~/.config/.user-dots/nvim/")
 for _, file in ipairs({ "secrets.lua", "local.lua" }) do
-  local path = user_dots .. file
-  if vim.fn.filereadable(path) == 1 then
-    dofile(path)
-  end
+	local path = user_dots .. file
+	if vim.fn.filereadable(path) == 1 then
+		dofile(path)
+	end
 end