Add radial mode, UI controls, front camera, update to API 35

- Add radial/elliptical blur mode with aspect ratio control
- Add UI sliders for blur intensity, falloff, and shape
- Add front camera support with flip button
- Update minimum SDK to API 35 (Android 15)
- Enable landscape orientation (fullSensor)
- Rename app to "Naiv Tilt Shift Camera"
- Set APK output name to naiv-tilt-shift
- Add project specification document

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tiltshift-spec.md

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+# Tilt-Shift Camera App Specification
+
+## Overview
+
+A camera app that applies real-time tilt-shift (miniature) effects to photos and videos. The effect is applied live during preview and capture, with the final output matching what the user sees on screen.
+
+## Target Platform
+
+- **Minimum API**: 35 (Android 15)
+- **Devices**: Phones (tablet support optional)
+
+---
+
+## Core Features
+
+### Blur Modes
+
+#### Linear Mode
+- Horizontal band of focus with blur above and below
+- Freely rotatable (0–360°)
+- Adjustable position (drag anywhere on screen)
+- Adjustable band width
+
+#### Radial/Elliptical Mode
+- Central focus point with blur radiating outward
+- Adjustable shape: circle to ellipse (aspect ratio control)
+- Freely rotatable
+- Adjustable position (drag anywhere on screen)
+- Adjustable focus region size
+
+### Blur Parameters (both modes)
+- **Intensity**: Strength of the blur effect (0–100%)
+- **Falloff**: Transition sharpness from focused to blurred (sharp edge ↔ gradual gradient)
+
+---
+
+## Camera Features
+
+### Capture Modes
+- **Photo**: Full-resolution still capture with effect applied
+- **Video**: Real-time recording with effect applied, audio pass-through
+
+### Zoom
+- Smooth continuous zoom gesture (pinch)
+- Snap points at each available physical lens (wide, main, telephoto as available)
+- Lens indicator showing current zoom level / active lens
+- Behaviour matches native camera app
+
+### Cameras
+- Front and rear camera support
+- Camera switch button
+
+---
+
+## User Interface
+
+### Live Preview
+- Full-screen camera preview
+- Effect applied in real-time
+- What you see is what you get (preview matches output exactly)
+
+### Focus Region Overlay
+- Visual indicator showing current focus region while adjusting
+- Semi-transparent mask or outline showing blur zone
+- Hides after adjustment (or stays subtle)
+
+### Gesture Controls
+| Gesture | Action |
+|---------|--------|
+| Drag (one finger) | Move focus region |
+| Pinch (two finger) | Resize focus region |
+| Rotate (two finger) | Rotate focus region / ellipse |
+| Pinch (on preview, outside focus region) | Zoom camera |
+
+### On-Screen Controls
+- Mode toggle: Linear / Radial
+- Blur intensity slider
+- Falloff slider
+- Ellipse aspect ratio slider (radial mode only)
+- Shutter button (photo)
+- Record button (video)
+- Camera flip button
+- Zoom level indicator
+- Settings access
+
+### Optional Enhancements (Future)
+- Saturation boost slider
+- Contrast adjustment
+- Vignette toggle/strength
+- Presets (quick settings combinations)
+
+---
+
+## Output
+
+### Photos
+- **Resolution**: Full sensor resolution
+- **Format**: JPEG
+- **Location**: Default system pictures directory (DCIM or Pictures)
+- **Metadata**: Full EXIF preserved from camera
+- **GPS**: Location embedded if device permissions granted
+- **Storage**: Processed image only (original not kept)
+
+### Videos
+- **Resolution**: Up to sensor max (may need to cap for real-time performance)
+- **Format**: MP4 (H.264 or H.265)
+- **Audio**: Pass-through from device microphone
+- **Location**: Default system video directory
+- **Metadata**: Standard video metadata with location if permitted
+- **Storage**: Processed video only
+
+---
+
+## Permissions Required
+
+- `CAMERA` – camera access
+- `RECORD_AUDIO` – video recording
+- `ACCESS_FINE_LOCATION` – GPS tagging (optional, prompt user)
+- `WRITE_EXTERNAL_STORAGE` – not needed for API 35 (scoped storage)
+
+---
+
+## Technical Approach
+
+### Camera
+- CameraX (Camera2 interop if needed for manual controls)
+- Preview bound to OpenGL surface for shader processing
+
+### Graphics Pipeline
+- OpenGL ES 3.0
+- Camera frames → texture → blur shader → display/encode
+- Two-pass Gaussian blur with distance-based mask
+- Same shader path for preview and capture (guarantees match)
+
+### Video Encoding
+- MediaCodec surface input
+- Rendered frames go directly to encoder
+- May need resolution/framerate limits for smooth real-time performance on lower-end devices
+
+### Storage
+- MediaStore API for saving to standard locations
+- ExifInterface for photo metadata
+- Location services for GPS coordinates
+
+---
+
+## Design Decisions
+
+- **Orientation**: Portrait and landscape supported, UI adapts
+- **Aspect ratio**: Native sensor ratio only, no crop options
+- **Flash/torch**: Not included
+- **Manual exposure**: Not included
+- **Reference device**: Pixel 7 Pro (minimum performance target)
+- **Zoom during recording**: Locked at recording start
+- **Settings persistence**: No, reset to defaults each launch
+- **Weaker devices**: No fallback, let them struggle
+
+---
+
+## Out of Scope (v1)
+
+- Path/curve-based focus regions
+- Multiple focus points
+- Filter presets or other effects beyond tilt-shift
+- RAW capture
+- Pro manual controls (ISO, shutter speed, focus)
+- Cloud/social sharing integration
+
+---
+
+## Success Criteria
+
+1. Live preview blur matches saved output exactly
+2. Smooth 30fps preview with effect on mid-range devices
+3. Video recording at minimum 1080p30 with real-time effect
+4. Sub-second capture latency for photos
+5. Intuitive gesture controls requiring no tutorial