fix: cap Action/Actor embed field values to discord's 1024-char limit (dpylogger-8)

The 1024-char cap + empty substitute only ever applied to the Log field.
Action and Actor got no cap, so a long action/actor string (a real path -
e.g. a long command invocation string as the action) triggers Discord's
BASE_TYPE_MAX_LENGTH 400 on send; _send swallows that via log.exception and
returns None, silently losing the Discord message while the stdlib mirror
survives. Route all three fields through one _cap_field helper (single
source for the 1024 constant) instead of duplicating the cap logic.

Signed-off-by: disqualifier <dev@disqualifier.me>

src/dpy_logger/dpy_logger.py

@@ -54,6 +54,7 @@ DEFAULT_COLORS = {
 }
 
 DISCORD_CONTENT_LIMIT = 2000
+DISCORD_FIELD_VALUE_LIMIT = 1024
 
 LEVEL_MAP = {
     "debug": logging.DEBUG,
@@ -159,6 +160,13 @@ class DPYLogger:
             raise ValueError(f"[dpy_logger] configured channel {channel_id} is not a text channel")
         return channel
 
+    @staticmethod
+    def _cap_field(value: str) -> str:
+        """cap an embed field value to discord's 1024-char limit, truncating with an ellipsis"""
+        if len(value) > DISCORD_FIELD_VALUE_LIMIT:
+            return value[:DISCORD_FIELD_VALUE_LIMIT - 3] + "..."
+        return value
+
     def build_embed(self, level, action, actor, details):
         """build the embed for a log call
 
@@ -170,15 +178,13 @@ class DPYLogger:
         if self._embed_builder is not None:
             return self._embed_builder(self, level, action, actor, details)
         em = discord.Embed(color=self.colors[level])
+        # discord 400s an empty or >1024-char field value; substitute + cap on every field
         if action is not None and str(action) != "":
-            em.add_field(name="Action", value=f"`{action}`", inline=True)
+            em.add_field(name="Action", value=self._cap_field(f"`{action}`"), inline=True)
         if actor is not None and str(actor) != "":
-            em.add_field(name="Actor", value=f"`{actor}`", inline=True)
-        # discord 400s an empty or >1024-char field value; substitute + cap
+            em.add_field(name="Actor", value=self._cap_field(f"`{actor}`"), inline=True)
         log_value = str(details) if details is not None and str(details) != "" else "(no message)"
-        if len(log_value) > 1024:
-            log_value = log_value[:1021] + "..."
-        em.add_field(name="Log", value=log_value, inline=False)
+        em.add_field(name="Log", value=self._cap_field(log_value), inline=False)
         em.timestamp = datetime.now(self.timezone)
         em.set_footer(text=f"{self.footer} Logging".strip(), icon_url=self.avatar)
         return em