Implement two-pass separable Gaussian blur for camera preview

Replace the single-pass 9-tap directional blur with a three-pass
pipeline: passthrough (camera→FBO), horizontal blur (FBO-A→FBO-B),
vertical blur (FBO-B→screen). This produces a true 2D Gaussian with
a 13-tap kernel per pass, eliminating the visible banding/streaking
of the old approach.

Key changes:
- TiltShiftRenderer: FBO ping-pong with two color textures, separate
  fullscreen quad for blur passes (no crop-to-fill), drawQuad helper
- TiltShiftShader: manages two programs (passthrough + blur), blur
  program uses raw screen-space angle (no camera rotation adjustment)
- tiltshift_fragment.glsl: rewritten for sampler2D in screen space,
  aspect correction on X axis (height-normalized), uBlurDirection
  uniform for H/V selection, wider falloff (3x multiplier)
- New tiltshift_passthrough_fragment.glsl for camera→FBO copy
- TiltShiftOverlay: shrink PINCH_SIZE zone (1.3x, was 2.0x) so
  pinch-to-zoom is reachable over more of the screen
- CameraManager: optimistic zoom update fixes pinch-to-zoom stalling
  (stale zoomRatio base prevented delta accumulation)

Bump version to 1.1.3.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

version.properties

@@ -1,4 +1,4 @@
 versionMajor=1
 versionMinor=1
-versionPatch=2
-versionCode=4
+versionPatch=3
+versionCode=5