Add camera view shape options

[BradGroux]

Summary

• Add 3:2, 2:3, and Circle options to the camera shape controls
• Add the same Camera Shape picker to pre-recording Options when a camera is selected
• Apply the selected shape live to the floating webcam preview before and during recording
• Seed new editor projects from the pre-recording camera shape choice
• Render Circle as a 1:1 camera view with a fixed 50% radius
• Apply the same circular rendering in editor preview, drag shadows, custom camera regions, and export

Closes #13

Validation

• make format
• xcodebuild -project Reframed.xcodeproj -scheme Reframed -configuration Debug build -quiet -derivedDataPath .build -destination "platform=macOS,arch=$(uname -m)" CODE_SIGNING_ALLOWED=NO
• make build fails locally because this branch intentionally does not include the separate signing fix from PR Fix local debug builds without signing certificate #12

[Copilot]

Pull request overview

Adds additional camera framing options (3:2, 2:3, Circle) and centralizes corner-radius computation so the chosen shape renders consistently across the editor preview, interactions (drag shadow), custom camera regions, and export compositing.

Changes:

• Extend CameraAspect with 3:2, 2:3, and Circle options and add shared helpers (pickerRows, isCircle, cornerRadius(in:percentage:)).
• Update editor UI controls to present aspect options in multiple segmented rows and disable the radius slider for Circle.
• Replace ad-hoc radius calculations with CameraAspect.cornerRadius(...) in preview layout/interaction and compositor/export code paths.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Reframed/Editor/VideoPreviewContainer+Layout.swift	Uses CameraAspect.cornerRadius(...) to ensure preview masking/shadow paths match the selected shape (including Circle).
Reframed/Editor/VideoPreviewContainer+Interaction.swift	Updates drag shadow rounding to respect the selected camera shape consistently while dragging.
Reframed/Editor/PropertiesPanel+CameraTab.swift	Presents aspect options using multiple SegmentPicker rows and disables radius control for Circle.
Reframed/Editor/EditorTypes.swift	Adds new camera aspects plus shared helpers for picker layout and radius computation (Circle forces 50%).
Reframed/Editor/CameraRegionEditPopover.swift	Mirrors the updated aspect selection UI and Circle radius behavior for custom camera regions.
Reframed/Compositor/VideoCompositor+InstructionBuilder.swift	Computes exported camera corner radius via CameraAspect.cornerRadius(...) for consistent output rendering.
Reframed/Compositor/FrameRenderer+Helpers.swift	Applies the same corner-radius logic when resolving custom camera regions during rendering.

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