feat: add 'state' field to mood activities for richer Discord presence

- Add 'state' field to all 139 activity entries in activities.yaml
  - Songs: state shows artist (e.g. 'by kz (livetune)')
  - Games: state shows genre (e.g. 'Rhythm Game', 'Sandbox', 'FPS')
- Update pick_activity_for_mood() to return 3-tuple (type, name, state)
- Update update_bot_presence() to pass state to discord.Activity()
- Add state validation in set_activities_for_mood() (optional string)
- Update Web UI editor: view shows state, edit form has state input
- State is fully optional — backward compatible, no breaking changes

The 'state' field appears as a secondary text line in Discord profile
popup, the richest display possible for bot accounts (full Rich Presence
with cover art/buttons is server-side restricted to OAuth applications).

bot/static/index.html

@@ -6883,7 +6883,9 @@ function activitiesRenderView(section, mood, entries) {
     const label = entry.type === 'listening' ? 'Listening to' : 'Playing';
     html += `<div class="act-entry">`;
     html += `<span class="act-entry-icon">${icon}</span>`;
-    html += `<span style="flex:1;">${escapeHtml(entry.name)}</span>`;
+    html += `<span style="flex:1;">${escapeHtml(entry.name)}`;
+    if (entry.state) html += ` <span style="color:#aaa; font-size:0.85rem;">— ${escapeHtml(entry.state)}</span>`;
+    html += `</span>`;
     html += `<span style="color:#888; font-size:0.8rem;">weight: ${entry.weight}</span>`;
     html += `</div>`;
   }
@@ -6902,8 +6904,9 @@ function activitiesRenderEditForm(section, mood, entries) {
     html += `<option value="listening" ${e.type === 'listening' ? 'selected' : ''}>🎵 Listening</option>`;
     html += `<option value="playing" ${e.type === 'playing' ? 'selected' : ''}>🎮 Playing</option>`;
     html += `</select>`;
-    html += `<input type="text" id="act-name-${section}-${mood}-${i}" value="${escapeHtml(e.name)}" placeholder="Song/Game name">`;
-    html += `<input type="number" id="act-weight-${section}-${mood}-${i}" value="${e.weight}" min="1" max="20">`;
+    html += `<input type="text" id="act-name-${section}-${mood}-${i}" value="${escapeHtml(e.name)}" placeholder="Song/Game name" style="flex:2; min-width:120px;">`;
+    html += `<input type="text" id="act-state-${section}-${mood}-${i}" value="${escapeHtml(e.state || '')}" placeholder="Artist / Genre (optional)" style="flex:1.5; min-width:100px;">`;
+    html += `<input type="number" id="act-weight-${section}-${mood}-${i}" value="${e.weight}" min="1" max="20" style="width:60px;">`;
     html += `<button onclick="activitiesRemoveEntry('${section}','${mood}',${i})" style="background:#c0392b; padding:0.3rem 0.5rem;" title="Remove">✕</button>`;
     html += `</div>`;
   }
@@ -6949,7 +6952,7 @@ function activitiesAddEntry(section, mood) {
   const key = `${section}/${mood}`;
   // First, sync current form values to cache
   activitiesSyncFormToCache(section, mood);
-  activitiesEditCache[key].push({ type: 'listening', name: '', weight: 1 });
+  activitiesEditCache[key].push({ type: 'listening', name: '', state: '', weight: 1 });
   activitiesRenderSection(section);
   // Keep the mood panel open
   const el = document.getElementById(`act-content-${section}-${mood}`);
@@ -6971,9 +6974,11 @@ function activitiesSyncFormToCache(section, mood) {
   for (let i = 0; i < entries.length; i++) {
     const typeEl = document.getElementById(`act-type-${section}-${mood}-${i}`);
     const nameEl = document.getElementById(`act-name-${section}-${mood}-${i}`);
+    const stateEl = document.getElementById(`act-state-${section}-${mood}-${i}`);
     const weightEl = document.getElementById(`act-weight-${section}-${mood}-${i}`);
     if (typeEl) entries[i].type = typeEl.value;
     if (nameEl) entries[i].name = nameEl.value;
+    if (stateEl) entries[i].state = stateEl.value || undefined;
     if (weightEl) entries[i].weight = parseInt(weightEl.value) || 1;
   }
   activitiesEditCache[key] = entries;

bot/utils/activities.py

@@ -103,6 +103,8 @@ def set_activities_for_mood(mood_name: str, is_evil: bool, activities: list):
             raise ValueError(f"Entry {i} must have a non-empty string 'name'")
         if not isinstance(entry.get("weight", 0), int) or entry.get("weight", 0) < 1:
             raise ValueError(f"Entry {i} weight must be a positive integer")
+        if "state" in entry and entry["state"] is not None and not isinstance(entry["state"], str):
+            raise ValueError(f"Entry {i} 'state' must be a string if provided")
 
     section = "evil" if is_evil else "normal"
     data = _load_activities()
@@ -116,19 +118,19 @@ def pick_activity_for_mood(mood_name: str, is_evil: bool = False):
     """Pick a weighted-random activity for a mood.
     
     Returns:
-        tuple: (activity_type, name) e.g. ("listening", "World is Mine")
-               Returns ("listening", "Vocaloid") as fallback if mood has no entries.
+        tuple: (activity_type, name, state) e.g. ("listening", "World is Mine", "by ryo (supercell)")
+               state may be None if not defined. Fallback: ("listening", "Vocaloid", None)
     """
     activities = get_activities_for_mood(mood_name, is_evil)
 
     if not activities:
         logger.debug(f"No activities defined for {'evil/' if is_evil else ''}{mood_name}, using fallback")
-        return ("listening", "Vocaloid")
+        return ("listening", "Vocaloid", None)
 
     # Weighted random selection
     weights = [entry.get("weight", 1) for entry in activities]
     chosen = random.choices(activities, weights=weights, k=1)[0]
-    return (chosen["type"], chosen["name"])
+    return (chosen["type"], chosen["name"], chosen.get("state"))
 
 
 async def update_bot_presence(mood_name: str, is_evil: bool = False):
@@ -151,16 +153,19 @@ async def update_bot_presence(mood_name: str, is_evil: bool = False):
             logger.info("Set presence: idle (asleep)")
             return
 
-        activity_type, name = pick_activity_for_mood(mood_name, is_evil)
+        activity_type, name, state = pick_activity_for_mood(mood_name, is_evil)
 
         if activity_type == "listening":
-            activity = discord.Activity(type=discord.ActivityType.listening, name=name)
+            activity = discord.Activity(type=discord.ActivityType.listening, name=name, state=state)
             log_label = f"Listening to {name}"
         else:
-            activity = discord.Game(name=name)
+            activity = discord.Activity(type=discord.ActivityType.playing, name=name, state=state)
             log_label = f"Playing {name}"
 
-        await globals.client.change_presence(activity=activity)
+        if state:
+            log_label += f" ({state})"
+
+        await globals.client.change_presence(status=discord.Status.online, activity=activity)
         logger.info(f"Set presence: {log_label} (mood={'evil/' if is_evil else ''}{mood_name})")
 
     except Exception as e: