fix: use server-side pagination and fix limit=500 exceeding API max

- Switch from client-side pagination (fetch all, slice) to server-side
  (pass limit/offset/progress params to API)
- Fixes limit=500 rejection (API max is 100)
- Footer now shows total_count from API response
- progress=close filter delegated to API instead of client-side

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cogs/refractor.py

@@ -167,13 +167,17 @@ class Refractor(commands.Cog):
             )
             return
 
-        params = [("team_id", team["id"]), ("limit", 500)]
+        page = max(1, page)
+        offset = (page - 1) * PAGE_SIZE
+        params = [("team_id", team["id"]), ("limit", PAGE_SIZE), ("offset", offset)]
         if card_type:
             params.append(("card_type", card_type))
         if season is not None:
             params.append(("season", season))
         if tier is not None:
             params.append(("tier", tier))
+        if progress:
+            params.append(("progress", progress))
 
         data = await db_get("refractor/cards", params=params)
         if not data:
@@ -183,21 +187,23 @@ class Refractor(commands.Cog):
             return
 
         items = data if isinstance(data, list) else data.get("items", [])
+        total_count = (
+            data.get("count", len(items)) if isinstance(data, dict) else len(items)
+        )
         if not items:
-            await interaction.edit_original_response(
-                content="No refractor data found for your team."
-            )
-            return
-
-        if progress == "close":
-            items = apply_close_filter(items)
-            if not items:
+            if progress == "close":
                 await interaction.edit_original_response(
                     content="No cards are currently close to a tier advancement."
                 )
-                return
+            else:
+                await interaction.edit_original_response(
+                    content="No refractor data found for your team."
+                )
+            return
 
-        page_items, total_pages = paginate(items, page)
+        total_pages = max(1, (total_count + PAGE_SIZE - 1) // PAGE_SIZE)
+        page = min(page, total_pages)
+        page_items = items
         lines = [format_refractor_entry(state) for state in page_items]
 
         embed = discord.Embed(
@@ -205,7 +211,9 @@ class Refractor(commands.Cog):
             description="\n\n".join(lines),
             color=0x6F42C1,
         )
-        embed.set_footer(text=f"Page {page}/{total_pages} · {len(items)} card(s) total")
+        embed.set_footer(
+            text=f"Page {page}/{total_pages} · {total_count} card(s) total"
+        )
 
         await interaction.edit_original_response(embed=embed)