feat(config): increase sleep duration to 1-4 minutes and expand default distraction keywords

1. Increased SLEEP_MIN_MS to 60s and SLEEP_MAX_MS to 240s so the cat takes real
   naps (1-4 min) instead of waking up after only a few seconds.
2. Increased SIT_MIN_MS to 15s and SIT_MAX_MS to 45s.
3. Added 'youtube', 'youtube.com/shorts', 'instagram', and 'twitch' to default
   distraction keywords. Browser tabs playing YouTube Shorts have titles like
   '<Video Title> - YouTube - Google Chrome' where 'shorts' does not appear.

catser/config.py

@@ -62,10 +62,10 @@ ACTION_WEIGHTS: Dict[str, Dict[str, int]] = {
 # Settled action intervals (ms)
 LIFE_ACTION_INTERVAL_MS: int = 9000
 SETTLED_ACTION_INTERVAL_MS: int = 3400
-SIT_MIN_MS: int = 3200
-SIT_MAX_MS: int = 9000
-SLEEP_MIN_MS: int = 6400
-SLEEP_MAX_MS: int = 18000
+SIT_MIN_MS: int = 15000
+SIT_MAX_MS: int = 45000
+SLEEP_MIN_MS: int = 60000    # 1 to 4 minutes of peaceful sleep
+SLEEP_MAX_MS: int = 240000
 
 
 # ==============================================================================
@@ -118,12 +118,15 @@ class Config:
     auto_fallback_to_win32: bool = True
     distraction_keywords: List[str] = field(default_factory=lambda: [
         "shorts",
-        "youtube shorts",
+        "youtube.com/shorts",
+        "youtube",
         "reels",
-        "instagram reels",
+        "instagram.com/reels",
+        "instagram",
         "tiktok",
         "reddit",
         "twitch.tv",
+        "twitch",
     ])
     distraction_apps: List[str] = field(default_factory=lambda: [
         # Users can add specific processes e.g. "discord.exe", "steam.exe"