feat(buffer): render forge links as concealed text with eol virt text

Problem: forge tokens were visible as raw text with no virtual text
labels, and the eol separator logic collapsed all gaps when
non-adjacent specifiers were absent.

Solution: add forge conceal syntax patterns in `setup_syntax()`, add
`PendingForge`/`PendingForgeClosed` highlight groups, handle the
`%l` specifier in `build_eol_virt()`, fix separator collapsing to
buffer one separator between present segments, and change
`concealcursor` to `nc` (reveal in visual and insert mode).

lua/pending/buffer.lua

@@ -365,7 +365,7 @@ end
 ---@param winid integer
 local function set_win_options(winid)
   vim.wo[winid].conceallevel = 3
-  vim.wo[winid].concealcursor = 'nvic'
+  vim.wo[winid].concealcursor = 'nc'
   vim.wo[winid].winfixheight = true
 end
 
@@ -379,6 +379,10 @@ local function setup_syntax(bufnr)
       syntax match taskCheckbox /\[!\]/ contained containedin=taskLine
       syntax match taskLine /^\/\d\+\/- \[.\] .*$/ contains=taskId,taskCheckbox
     ]])
+    local forge = require('pending.forge')
+    for _, pat in ipairs(forge.conceal_patterns()) do
+      vim.cmd('syntax match forgeRef /' .. pat .. '/ conceal contained containedin=taskLine')
+    end
   end)
 end
 
@@ -432,7 +436,7 @@ end
 
 ---@class pending.EolSegment
 ---@field type 'specifier'|'literal'
----@field key? 'c'|'r'|'d'
+---@field key? 'c'|'r'|'d'|'l'
 ---@field text? string
 
 ---@param fmt string
@@ -444,7 +448,7 @@ local function parse_eol_format(fmt)
   while pos <= len do
     if fmt:sub(pos, pos) == '%' and pos + 1 <= len then
       local key = fmt:sub(pos + 1, pos + 1)
-      if key == 'c' or key == 'r' or key == 'd' then
+      if key == 'c' or key == 'r' or key == 'd' or key == 'l' then
         table.insert(segments, { type = 'specifier', key = key })
         pos = pos + 2
       else
@@ -471,7 +475,10 @@ local function build_eol_virt(segments, m, icons)
   for i, seg in ipairs(segments) do
     if seg.type == 'specifier' then
       local text, hl
-      if seg.key == 'c' and m.show_category and m.category then
+      if seg.key == 'l' and m.forge_ref then
+        local forge = require('pending.forge')
+        text, hl = forge.format_label(m.forge_ref, m.forge_cache)
+      elseif seg.key == 'c' and m.show_category and m.category then
         text = icons.category .. ' ' .. m.category
         hl = 'PendingHeader'
       elseif seg.key == 'r' and m.recur then
@@ -488,26 +495,20 @@ local function build_eol_virt(segments, m, icons)
   end
 
   local virt_parts = {}
-  for i, r in ipairs(resolved) do
+  local pending_sep = nil
+  for _, r in ipairs(resolved) do
     if r.literal then
-      local prev_present, next_present = false, false
+      if #virt_parts > 0 and not pending_sep then
-      for j = i - 1, 1, -1 do
+        pending_sep = { r.text, r.hl }
-        if not resolved[j].literal then
-          prev_present = resolved[j].present
-          break
-        end
-      end
-      for j = i + 1, #resolved do
-        if not resolved[j].literal then
-          next_present = resolved[j].present
-          break
-        end
-      end
-      if prev_present and next_present then
-        table.insert(virt_parts, { r.text, r.hl })
       end
     elseif r.present then
+      if pending_sep then
+        table.insert(virt_parts, pending_sep)
+        pending_sep = nil
+      end
       table.insert(virt_parts, { r.text, r.hl })
+    else
+      pending_sep = nil
     end
   end
   return virt_parts
@@ -552,6 +553,8 @@ local function setup_highlights()
   vim.api.nvim_set_hl(0, 'PendingBlocked', { link = 'DiagnosticError', default = true })
   vim.api.nvim_set_hl(0, 'PendingRecur', { link = 'DiagnosticInfo', default = true })
   vim.api.nvim_set_hl(0, 'PendingFilter', { link = 'DiagnosticWarn', default = true })
+  vim.api.nvim_set_hl(0, 'PendingForge', { link = 'DiagnosticInfo', default = true })
+  vim.api.nvim_set_hl(0, 'PendingForgeClosed', { link = 'Comment', default = true })
 end
 
 ---@return string
@@ -727,6 +730,7 @@ function M.render(bufnr)
     end
   end
   restore_folds(bufnr)
+
 end
 
 ---@return nil