feat: auto-start Dying condition when HP hits 0, clear when HP recovers

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/src/routes/characters.ts

@@ -6,6 +6,7 @@ import db from "../db.js";
 import { broadcastToCampaign } from "../socket.js";
 import { parseJson } from "../utils/parseJson.js";
 import { requireAuth } from "../auth/middleware.js";
+import { rollDice } from "../dice.js";
 
 type CampaignParams = ParamsDictionary & { campaignId: string };
 
@@ -192,7 +193,7 @@ router.patch("/:id", requireAuth, async (req, res) => {
       "name", "class", "ancestry", "level", "xp", "hp_current", "hp_max",
       "ac", "alignment", "title", "notes", "background", "deity", "languages",
       "gp", "sp", "cp", "gear_slots_max", "overrides", "color", "luck_token",
-      "torch_lit_at",
+      "torch_lit_at", "is_dead",
     ];
 
     const updates: string[] = [];
@@ -218,6 +219,48 @@ router.patch("/:id", requireAuth, async (req, res) => {
       return;
     }
 
+    // Auto-start or clear Dying condition based on HP change
+    if (req.body.hp_current !== undefined) {
+      const newHp = Number(req.body.hp_current);
+
+      if (newHp <= 0) {
+        // Check if already dying or permanently dead
+        const [dyingRows] = await db.execute<RowDataPacket[]>(
+          "SELECT id FROM character_conditions WHERE character_id = ? AND name = 'Dying'",
+          [id]
+        );
+        const [deadRows] = await db.execute<RowDataPacket[]>(
+          "SELECT is_dead FROM characters WHERE id = ?",
+          [id]
+        );
+        const isAlreadyDying = dyingRows.length > 0;
+        const isAlreadyDead = Boolean(deadRows[0]?.is_dead);
+
+        if (!isAlreadyDying && !isAlreadyDead) {
+          // Roll 1d4, add CON modifier, clamp to minimum 1
+          const d4 = rollDice("1d4");
+          const [statRows] = await db.execute<RowDataPacket[]>(
+            "SELECT value FROM character_stats WHERE character_id = ? AND stat_name = 'CON'",
+            [id]
+          );
+          const conValue = (statRows[0]?.value as number) ?? 10;
+          const conMod = Math.floor((conValue - 10) / 2);
+          const roundsRemaining = Math.max(1, d4.total + conMod);
+
+          await db.execute(
+            "INSERT INTO character_conditions (character_id, name, description, rounds_remaining) VALUES (?, 'Dying', '', ?)",
+            [id, roundsRemaining]
+          );
+        }
+      } else {
+        // HP above 0: remove any Dying condition (character was healed)
+        await db.execute(
+          "DELETE FROM character_conditions WHERE character_id = ? AND name = 'Dying'",
+          [id]
+        );
+      }
+    }
+
     const [rows] = await db.execute<RowDataPacket[]>(
       "SELECT * FROM characters WHERE id = ?",
       [id]