feat: wire up stuck-weapon follow-up for impale/slash specials

Add POST /api/combat/stuck-weapon-removal endpoint supporting three
removal types: attacker (weapon skill roll), self (STR+CON roll), and
first-aid (First Aid skill roll). After a special hit with damage
through, the attack result UI shows a stuck-weapon card with buttons
for each removal option.

public/app.js

@@ -574,6 +574,45 @@ function combatantOptions(selectedId) {
   return combatants().map((c) => `<option value="${c.id}" ${c.id === selectedId ? 'selected' : ''}>${escapeHtml(c.name)}</option>`).join('');
 }
 
+function renderStuckWeaponFollowUp({ attackerCombatantId, defenderCombatantId, weaponName, kind }) {
+  const wrap = el(`<div class="card" style="margin-top:0.75rem"></div>`);
+  wrap.appendChild(el(`<p><strong>Weapon stuck (${kind}).</strong> Choose removal attempt:</p>`));
+  const removalResult = el(`<div></div>`);
+
+  async function doRemoval(removalType, extra = {}) {
+    try {
+      const res = await api('POST', '/api/combat/stuck-weapon-removal', {
+        attackerCombatantId, defenderCombatantId, weaponName, kind, removalType, ...extra,
+      });
+      state.combat = res.combatState;
+      const r = res.result;
+      const outcome = r.weaponBreaks ? 'Weapon breaks!' : r.success ? 'Weapon removed successfully.' : 'Weapon stays stuck.';
+      removalResult.innerHTML = `<p>${escapeHtml(outcome)}</p>`;
+      await loadLog();
+      renderSidebar();
+      renderLog();
+    } catch (err) {
+      removalResult.innerHTML = `<p class="error-message">${escapeHtml(err.message)}</p>`;
+    }
+  }
+
+  const attackerBtn = el(`<button class="button">Attacker removes weapon</button>`);
+  attackerBtn.addEventListener('click', () => doRemoval('attacker'));
+
+  const selfBtn = el(`<button class="button">Target removes from self</button>`);
+  selfBtn.addEventListener('click', () => doRemoval('self'));
+
+  const faSkill = el(`<input type="number" placeholder="First Aid %" style="width:7rem">`);
+  const faBtn = el(`<button class="button">Remove with First Aid</button>`);
+  faBtn.addEventListener('click', () => doRemoval('first-aid', { firstAidSkillPercent: Number(faSkill.value) || 0 }));
+
+  const btnRow = el(`<div style="display:flex;gap:0.5rem;flex-wrap:wrap;align-items:center;margin-top:0.5rem"></div>`);
+  btnRow.append(attackerBtn, selfBtn, faSkill, faBtn);
+  wrap.appendChild(btnRow);
+  wrap.appendChild(removalResult);
+  return wrap;
+}
+
 function renderCombatMain() {
   const wrap = el(`<div></div>`);
   if (combatants().length < 1) {
@@ -632,12 +671,27 @@ function renderCombatMain() {
     try {
       const res = await api('POST', '/api/combat/attack', body);
       state.combat = res.combatState;
-      resultBox.innerHTML = `
+      resultBox.innerHTML = '';
+      const summary = el(`<div>
         <p>${tierTag(res.result.attackCheck.tier)} roll ${res.result.attackCheck.roll} vs ${res.result.effectiveSkillPercent}% (base ${res.result.effectiveSkillPercent - res.result.modifierTotal}${res.result.modifierTotal ? `, modifiers ${res.result.modifierTotal > 0 ? '+' : ''}${res.result.modifierTotal}` : ''})</p>
         ${res.result.hitLocationRoll ? `<p>Hit location: ${res.result.hitLocationRoll.location}</p>` : ''}
         ${res.result.damageThrough != null ? `<p>Damage through: ${res.result.damageThrough}</p>` : ''}
         ${res.result.fumble ? `<p>Fumble: ${res.result.fumble.results.map((r) => r.effect).join('; ')}</p>` : ''}
-      `;
+      </div>`);
+      resultBox.appendChild(summary);
+
+      const special = res.result.damageResult?.special;
+      const weaponStuck = (special === 'impale' || special === 'slash') && res.result.damageThrough > 0;
+      if (weaponStuck) {
+        const stuckBox = renderStuckWeaponFollowUp({
+          attackerCombatantId: body.attackerCombatantId,
+          defenderCombatantId: body.defenderCombatantId,
+          weaponName: body.weaponName,
+          kind: special,
+        });
+        resultBox.appendChild(stuckBox);
+      }
+
       await loadLog();
       renderSidebar();
       renderLog();