fix(init): preserve cursor column and position in mutation functions (#152)

Problem: `toggle_complete()`, `toggle_priority()`, `adjust_priority()`,
`toggle_status()`, and `move_task()` captured only the row from
`nvim_win_get_cursor` and restored the cursor to column 0 after
re-render. Additionally, `toggle_complete()` followed the toggled task
to its new sorted position at the bottom of the category, which is
disorienting when working through a list of tasks.

Solution: Capture both row and column from the cursor, and restore the
column in all five functions. For `toggle_complete()`, instead of
chasing the task ID after render, clamp the cursor to the original row
(or total lines if shorter) and advance to the nearest task line,
similar to the `]t` motion in `textobj.lua`.

lua/pending/init.lua

@@ -544,7 +544,8 @@ function M.toggle_complete()
   if not require_saved() then
     return
   end
-  local row = vim.api.nvim_win_get_cursor(0)[1]
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local row, col = cursor[1], cursor[2]
   local meta = buffer.meta()
   if not meta[row] or meta[row].type ~= 'task' then
     return
@@ -578,12 +579,26 @@ function M.toggle_complete()
   end
   _save_and_notify()
   buffer.render(bufnr)
-  for lnum, m in ipairs(buffer.meta()) do
+  local new_meta = buffer.meta()
-    if m.id == id then
+  local total = #new_meta
-      vim.api.nvim_win_set_cursor(0, { lnum, 0 })
+  local target = math.min(row, total)
-      break
+  if new_meta[target] and new_meta[target].type == 'task' then
+    vim.api.nvim_win_set_cursor(0, { target, col })
+  else
+    for r = target, total do
+      if new_meta[r] and new_meta[r].type == 'task' then
+        vim.api.nvim_win_set_cursor(0, { r, col })
+        return
       end
     end
+    for r = target, 1, -1 do
+      if new_meta[r] and new_meta[r].type == 'task' then
+        vim.api.nvim_win_set_cursor(0, { r, col })
+        return
+      end
+    end
+    vim.api.nvim_win_set_cursor(0, { target, col })
+  end
 end
 
 ---@param id_str? string
@@ -654,7 +669,8 @@ function M.toggle_priority()
   if not require_saved() then
     return
   end
-  local row = vim.api.nvim_win_get_cursor(0)[1]
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local row, col = cursor[1], cursor[2]
   local meta = buffer.meta()
   if not meta[row] or meta[row].type ~= 'task' then
     return
@@ -675,7 +691,7 @@ function M.toggle_priority()
   buffer.render(bufnr)
   for lnum, m in ipairs(buffer.meta()) do
     if m.id == id then
-      vim.api.nvim_win_set_cursor(0, { lnum, 0 })
+      vim.api.nvim_win_set_cursor(0, { lnum, col })
       break
     end
   end
@@ -691,7 +707,8 @@ local function adjust_priority(delta)
   if not require_saved() then
     return
   end
-  local row = vim.api.nvim_win_get_cursor(0)[1]
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local row, col = cursor[1], cursor[2]
   local meta = buffer.meta()
   if not meta[row] or meta[row].type ~= 'task' then
     return
@@ -715,7 +732,7 @@ local function adjust_priority(delta)
   buffer.render(bufnr)
   for lnum, m in ipairs(buffer.meta()) do
     if m.id == id then
-      vim.api.nvim_win_set_cursor(0, { lnum, 0 })
+      vim.api.nvim_win_set_cursor(0, { lnum, col })
       break
     end
   end
@@ -829,7 +846,8 @@ function M.toggle_status(target_status)
   if not require_saved() then
     return
   end
-  local row = vim.api.nvim_win_get_cursor(0)[1]
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local row, col = cursor[1], cursor[2]
   local meta = buffer.meta()
   if not meta[row] or meta[row].type ~= 'task' then
     return
@@ -852,7 +870,7 @@ function M.toggle_status(target_status)
   buffer.render(bufnr)
   for lnum, m in ipairs(buffer.meta()) do
     if m.id == id then
-      vim.api.nvim_win_set_cursor(0, { lnum, 0 })
+      vim.api.nvim_win_set_cursor(0, { lnum, col })
       break
     end
   end
@@ -868,7 +886,8 @@ function M.move_task(direction)
   if not require_saved() then
     return
   end
-  local row = vim.api.nvim_win_get_cursor(0)[1]
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local row, col = cursor[1], cursor[2]
   local meta = buffer.meta()
   if not meta[row] or meta[row].type ~= 'task' then
     return
@@ -943,7 +962,7 @@ function M.move_task(direction)
 
   for lnum, m in ipairs(buffer.meta()) do
     if m.id == id then
-      vim.api.nvim_win_set_cursor(0, { lnum, 0 })
+      vim.api.nvim_win_set_cursor(0, { lnum, col })
       break
     end
   end