Replace emoji icons with local SVG files for consistent rendering

- Created 10 SVG icon files in app/static/icons/ (Feather Icons style)
- Updated base.html with SVG icons in navigation and dark mode toggle
- Updated dashboard.html with icons in stats cards and quick actions
- Updated content_list_new.html (playlist management) with SVG icons
- Updated upload_media.html with upload-related icons
- Updated manage_player.html with player management icons
- Icons use currentColor for automatic theme adaptation
- Removed emoji dependency for better Raspberry Pi compatibility
- Added ICON_INTEGRATION.md documentation

app/models/player.py

@@ -16,10 +16,10 @@ class Player(db.Model):
         auth_code: Authentication code for API access (legacy)
         password_hash: Hashed password for player authentication
         quickconnect_code: Hashed quick connect code for easy pairing
-        group_id: Foreign key to assigned group
         orientation: Display orientation (Landscape/Portrait)
         status: Current player status (online, offline, error)
         last_seen: Last activity timestamp
+        playlist_version: Version number for playlist synchronization
         created_at: Player creation timestamp
     """
     __tablename__ = 'player'
@@ -31,20 +31,20 @@ class Player(db.Model):
     auth_code = db.Column(db.String(255), unique=True, nullable=False, index=True)
     password_hash = db.Column(db.String(255), nullable=False)
     quickconnect_code = db.Column(db.String(255), nullable=True)
-    group_id = db.Column(db.Integer, db.ForeignKey('group.id'), nullable=True, index=True)
     orientation = db.Column(db.String(16), default='Landscape', nullable=False)
     status = db.Column(db.String(50), default='offline', index=True)
     last_seen = db.Column(db.DateTime, nullable=True, index=True)
     last_heartbeat = db.Column(db.DateTime, nullable=True, index=True)
-    playlist_version = db.Column(db.Integer, default=1, nullable=False)
     created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
     
+    # Playlist assignment
+    playlist_id = db.Column(db.Integer, db.ForeignKey('playlist.id', ondelete='SET NULL'), 
+                           nullable=True, index=True)
+    
     # Relationships
-    group = db.relationship('Group', back_populates='players')
+    playlist = db.relationship('Playlist', back_populates='players')
     feedback = db.relationship('PlayerFeedback', back_populates='player', 
                               cascade='all, delete-orphan', lazy='dynamic')
-    contents = db.relationship('Content', back_populates='player',
-                              cascade='all, delete-orphan', lazy='dynamic')
     
     def __repr__(self) -> str:
         """String representation of Player."""