I'll build OrthoPlate Studio, a professional medical SaaS prototype for orthognathic surgery STL viewing and plate planning. This is a complex multi-screen application, so let me set up a task list and start building.

Now let me read the existing layout to understand the current structure, then I'll start building the application:

Now let me create the application. I'll start with the state management store, then build the components systematically:

Now let me create the sidebar and header components:

Now let me move to the next task and create the main layout and upload screen:

Now let me create the Dashboard and Upload screens:

Now let me move to the 3D STL Viewer task - the most important part of this MVP:

Now let me move to the final task and create the remaining screens:

Now let me mark the tasks as complete and check for any missing UI components:

Good, all the UI components we need are available. Let me verify the application is working by checking the debug logs:

Let me verify the app structure is correct by checking a few key files:

All the screen files are in place. Let me check the debug logs to see if there are any errors:

The application has been built. Let me provide a summary of what was created:

OrthoPlate Studio is now complete! This professional medical SaaS research prototype for orthognathic surgery planning includes:

Core Features:

• Dark navy sidebar with bilingual Turkish/English navigation for all 9 screens (Dashboard, Upload, 3D Viewer, Plate Region, Plate Curve, Screw Planning, Safety Check, Report, Export)
• 3D STL Viewer using React Three Fiber with registered/preview mode toggle - the critical requirement to preserve original STL coordinates is implemented (no individual segment centering in registered mode)
• 8 upload slots for different anatomical segments (pre/post-op maxilla/mandible, dental scan, nerve canal, tooth roots, osteotomy line) with filename validation warnings
• Anatomical orientation controls (A/P/L/R/S/I) with GizmoViewcube showing current view direction
• Segment panel with 4 tabs: Segments (visibility, opacity, quick filters), Transform (rotation/flip controls), Performance (triangle counts, status), and Debug info

Complete Workflow:

• Dashboard with case statistics and mock case table
• Upload screen with STL-only validation and slot-specific file warnings
• Plate region selection cards for different surgical approaches
• Plate curve editor with mock point placement tools
• Screw planning with diameter selection and screw table
• Safety check with mock green/yellow/red warnings
• Report generation with surgeon approval area
• Export package with mock file downloads

The research prototype disclaimer appears prominently in the header: "Research prototype. Not for clinical use. Final surgical decisions remain the responsibility of the clinician."

Now I have a complete picture of the current implementation. Let me also check the viewer toolbar and viewer screen to understand the full integration:

Now I have a complete understanding of the current implementation. Let me update the store first to add the new global orientation state, then completely rewrite the STL viewer with all the requested features:

Now let me create the completely rewritten STL viewer with all the requested features:

Now let me rewrite the segment panel with all the new features including the Coordinate Presets panel, Grid controls, Alignment Wizard, and improved Debug tab:

Now let me update the viewer toolbar to clarify the separation between camera controls and model transforms:

Let me check the debug logs to see if there are any issues:

I see there's a hydration error in the Dashboard component related to date formatting. Let me fix that quickly since it's unrelated to my main changes, but it's causing issues:

Now let me check the logs again to see if everything compiles correctly:

Good, the latest compile was successful. The hydration errors are from before my fix was applied. The 3D viewer engine has been completely rewritten with all the requested features.

Here's a summary of all the improvements made to the STL viewer:

1. Coordinate System Presets Panel - Added a new "Orientation" tab with coordinate presets including Default STL, Dental Z-up, Dental Y-up, all flip options (A/P, L/R, S/I), and rotation presets (+/-90 degrees for each axis). Includes a toggle for "Apply to selected segment only".

2. Separated Camera View from Model Transform - Camera buttons in the toolbar only move the camera, while coordinate presets in the right panel rotate/flip the model group. Added explanatory text in the UI.

3. SurgicalGroup Parent - Created a SurgicalGroup component that wraps all STL meshes. Global orientation corrections are applied to this group, not individual meshes, preserving registration.

4. Fixed Registered Mode - In registered mode, original vertex coordinates are preserved. Individual meshes are not centered or normalized. Camera fits to the combined bounding box.

5. Improved Grid Controls - New "Grid" tab with show/hide toggle, plane selection (XY/XZ/YZ), opacity slider, and size slider. Grid is positioned below the anatomy by default.

6. Viewport Orientation Labels - Added fixed labels for S/I/L/R in the viewport corners.

7. Alignment Wizard - Added a guided 4-step wizard that asks about front direction, left/right, top/bottom, and maxilla/mandible relationship, applying transforms based on answers.

8. Segment Visual Clarity - Added quick filter buttons (Show All, Maxilla Only, Mandible Only, Max+Mand, Optional Only) and an explode view slider with a warning that it's visual only.

9. Selected Segment Outline - Green outline and label in viewport when a segment is selected.

10. Enhanced Debug Panel - Shows surgicalGroup rotation/scale/flip, selected segment local transform, combined bounding box, grid plane, current coordinate preset, and registered mode state.

11. Fixed Initial Camera - Starts with an anterior-oblique clinical view, properly centered on the combined bounding box.