feat: add smart shape recognition for whiteboard

[aarushii25]

Hi @KENZY004,

I've successfully implemented the Smart Shape Recognition feature for Issue #75. Here's a summary of what's working and what needs further iteration:

Working shapes:

Circle: detected via closed stroke with no sharp corners

Triangle: detected via geometric error calculation and edge point distribution

Rectangle: detected via corner/bounding-box error analysis

Straight Line: detected via point-to-line error calculation

Partially Working (Pentagon, Hexagon, Octagon):
These shapes require 5, 6, and 8 sharp corners respectively to be detected. However, during testing, the corner detection algorithm maxes out at ~4 corners even when drawing these shapes carefully. This is because:

The resampling + smoothing pipeline merges nearby corners.

Freehand drawing naturally rounds out corners, reducing sharpness.

The MIN_GAP constraint prevents detecting corners that are too close together.

Suggested next step:

Implementing a multi-stroke approach where each side is drawn separately, allowing the algorithm to combine individual strokes into a complex polygon.

[vercel]

Someone is attempting to deploy a commit to the MINHA's projects Team on Vercel.

A member of the Team first needs to authorize it.

[aarushii25]

Screen.Recording.2026-06-07.002349.mp4

[KENZY004]

Thanks for working on this! I wanted to test the feature locally, but I noticed you accidentally deleted the isHost variable in Whiteboard.jsx. This causes a fatal ReferenceError that crashes the whiteboard entirely (which is why the GitHub CI pipeline is failing). Please restore the isHost logic and fix the errors so I can test out the drawing feature!

[aarushii25]

Hi @KENZY004, sorry about that! The isHost logic got accidentally removed during the merge conflict resolution. I have restored it now, and the CI pipeline should pass. Let me know how the smart shapes feature feels!

[aarushii25]

@KENZY004 could you pls review it

[aarushii25]

@KENZY004 could you pls review it