It looks like a "short shot" of Minifigure, Utensil Bottle, Erlenmeyer Flask with Trans-Purple Fluid Pattern (pictured below) which is included in the set. I would even say it lacks the Trans-clear "coating" around Trans-Purple piece of the combined element.
Short shot - is a term used in LEGO community to describe an uncommon occurrence ...
The part is Window Round 3 x 3 x 2 (73878).
It was a new mold for 2021, and one of its first uses was as windows on Andrea's House (41449).
This piece can be used on buildings anywhere you'd like a curved window. It is easy to imagine how it could have been used on earlier sets, such as the "curved" windows on the Pet Shop:
This part introduces ...
The models featured on Bricklink include a parts list, model file and instructions. You can see there that the curved tent is a skateboard ramp and the edges are 1x4 tiles attached with Technic pin 1/2.
The number indicates part 4719 - bicycle frame.
As you can see, it has a straight handlebars and kickstand. Your particular piece must have been modified to fit some specific purpose. Lego does not reuse the same mold numbers much, and never on the purpose, so I highly doubt if it was molded that way.
These parts belong to a ton of different sets.
Black Engine, Smooth Large, 1 x 2 Thin Top Plate can be found in 6 sets.
Black Tail with Rounded Top, Aquazone Aquashark Blue Shark with Red 'X' Pattern belong to one of three sets.
Slope 33 3 x 2 with Exploriens Logo Pattern was available in 6 sets.
White Hinge Train Gate 2 x 4 with Satellite ...
The first tile is Tile 1 x 2 with Groove with Copper and White Circuitry, Red Rectangle and 4 Squares Pattern
Appearing in these 10 sets.
It looks like yours is Dark Gray.
The second tile is Tile 1 x 2 with Groove with Vehicle Control Panel Pattern
Appearing in these 82 sets.
It looks like yours is Dark Bluish Gray.
You can find all of these elements listed on Bricklink under "Technic, Steering" category
Assembled combinations are:
Technic, Steering Portal Axle, Housing with Dark Bluish Gray Technic, Steering Wheel Hub 3 Pin Round (92908 / 92909)
Technic, Steering Axle with 2 Pin Holes and 2 Axle Holes with Dark Bluish Gray Wheel Hub (23801 / 92909)
Here's an example of how walls have been built. If you look closely on original pictures you can also see 2 x 2 top hinge piece (marked in Yellow here) used for attaching it on the bottom.
Roof is, however, not connected to the top edge. This is how top edge looks on one side of the roof as it is made out of Technic pieces, mostly:
4623a or ...
That would be
Part# 30360 : Cylinder 3 x 6 x 2 2/3 Horizontal - Round Connections Between Interior Studs
Part# 93168 : Cylinder 3 x 6 x 2 2/3 Horizontal - Square Connections Between Interior Studs
Both are essentially the same part, just a mold variation
No. It's older than that.
This element has been in 9 sets, in trans-dark blue (as pictured) it has been in 4:
that bricklink says came out in 1981 and 1983