fix(man): filter OSC 8 hyperlink markup #29171

Problem: `man cmake` shows "8;;https://cmake.orghttps://cmake.org8;;"
Solution: Remove noise so that it shows as "https://cmake.org".
See also: https://en.wikipedia.org/wiki/ANSI_escape_code#OSC

runtime/lua/man.lua

@@ -35,7 +35,7 @@ local function highlight_line(line, linenr)
   ---@type string[]
   local chars = {}
   local prev_char = ''
-  local overstrike, escape = false, false
+  local overstrike, escape, osc8 = false, false, false
 
   ---@type table<integer,{attr:integer,start:integer,final:integer}>
   local hls = {} -- Store highlight groups as { attr, start, final }
@@ -139,6 +139,12 @@ local function highlight_line(line, linenr)
       prev_char = ''
       byte = byte + #char
       chars[#chars + 1] = char
+    elseif osc8 then
+      -- eat characters until String Terminator or bell
+      if (prev_char == '\027' and char == '\\') or char == '\a' then
+        osc8 = false
+      end
+      prev_char = char
     elseif escape then
       -- Use prev_char to store the escape sequence
       prev_char = prev_char .. char
@@ -157,8 +163,11 @@ local function highlight_line(line, linenr)
           add_attr_hl(match + 0) -- coerce to number
         end
         escape = false
-      elseif not prev_char:match('^%[[\032-\063]*$') then
-        -- Stop looking if this isn't a partial CSI sequence
+      elseif prev_char == ']8;' then
+        osc8 = true
+        escape = false
+      elseif not prev_char:match('^[][][\032-\063]*$') then
+        -- Stop looking if this isn't a partial CSI or OSC sequence
         escape = false
       end
     elseif char == '\027' then