feat: complete task editing coverage (#109)

Problem: the task editing surface had gaps — category and recurrence had
no keymaps, `:Pending edit` required knowing the task ID, tasks couldn't
be reordered with a keymap, priority was binary (0/1), and `wip`/`blocked`
states were documented but unimplemented.

Solution: fill every cell so every property is editable in every way.

- `gc`/`gr` keymaps for category select and recurrence prompt
- cursor-aware `:Pending edit` (omit ID to use task under cursor)
- `J`/`K` keymaps to reorder tasks within a category
- multi-level priorities (`max_priority` config, `g!` cycles 0→1→2→3→0)
- `+!!`/`+!!!` tokens in `:Pending edit`, `:Pending add`, `parse.body()`
- `PendingPriority2`/`PendingPriority3` highlight groups
- `gw`/`gb` keymaps toggle `wip`/`blocked` status
- `>`/`=` state chars in buffer rendering and diff parsing
- `PendingWip`/`PendingBlocked` highlight groups
- sort order: wip → pending → blocked → done
- `wip`/`blocked` filter predicates and icons

lua/pending/views.lua

@@ -41,9 +41,32 @@ local function format_due(due)
   return formatted
 end
 
+---@type table<string, integer>
+local status_rank = { wip = 0, pending = 1, blocked = 2, done = 3 }
+
+---@param task pending.Task
+---@return string
+local function state_char(task)
+  if task.status == 'done' then
+    return 'x'
+  elseif task.status == 'wip' then
+    return '>'
+  elseif task.status == 'blocked' then
+    return '='
+  elseif task.priority > 0 then
+    return '!'
+  end
+  return ' '
+end
+
 ---@param tasks pending.Task[]
 local function sort_tasks(tasks)
   table.sort(tasks, function(a, b)
+    local ra = status_rank[a.status] or 1
+    local rb = status_rank[b.status] or 1
+    if ra ~= rb then
+      return ra < rb
+    end
     if a.priority ~= b.priority then
       return a.priority > b.priority
     end
@@ -57,6 +80,11 @@ end
 ---@param tasks pending.Task[]
 local function sort_tasks_priority(tasks)
   table.sort(tasks, function(a, b)
+    local ra = status_rank[a.status] or 1
+    local rb = status_rank[b.status] or 1
+    if ra ~= rb then
+      return ra < rb
+    end
     if a.priority ~= b.priority then
       return a.priority > b.priority
     end
@@ -95,7 +123,7 @@ function M.category_view(tasks)
       by_cat[cat] = {}
       done_by_cat[cat] = {}
     end
-    if task.status == 'done' then
+    if task.status == 'done' or task.status == 'deleted' then
       table.insert(done_by_cat[cat], task)
     else
       table.insert(by_cat[cat], task)
@@ -146,7 +174,7 @@ function M.category_view(tasks)
 
     for _, task in ipairs(all) do
       local prefix = '/' .. task.id .. '/'
-      local state = task.status == 'done' and 'x' or (task.priority > 0 and '!' or ' ')
+      local state = state_char(task)
       local line = prefix .. '- [' .. state .. '] ' .. task.description
       table.insert(lines, line)
       table.insert(meta, {
@@ -157,7 +185,7 @@ function M.category_view(tasks)
         status = task.status,
         category = cat,
         priority = task.priority,
-        overdue = task.status == 'pending' and task.due ~= nil and parse.is_overdue(task.due)
+        overdue = task.status ~= 'done' and task.due ~= nil and parse.is_overdue(task.due)
           or nil,
         recur = task.recur,
       })
@@ -209,7 +237,7 @@ function M.priority_view(tasks)
       status = task.status,
       category = task.category,
       priority = task.priority,
-      overdue = task.status == 'pending' and task.due ~= nil and parse.is_overdue(task.due) or nil,
+      overdue = task.status ~= 'done' and task.due ~= nil and parse.is_overdue(task.due) or nil,
       show_category = true,
       recur = task.recur,
     })