feat(scan): add camera capture for Android with toggle between upload and live camera

- Add CameraCapture component with live viewfinder via getUserMedia
- Support rear/environment camera (default) with switch to front/user
- Capture to JPEG 92% quality via canvas, reuse existing upload flow
- Toggle between 'Unggah' (file upload) and 'Kamera' (live capture) modes
- Error handling for denied/not found/not readable in Bahasa Indonesia
- Add patch script for AndroidManifest CAMERA permission (gen/ is gitignored)

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

apps/tauri/scripts/patch-android-manifest.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# Patches the generated AndroidManifest.xml to add CAMERA permission.
+# Run after `tauri android init` to apply.
+set -euo pipefail
+
+MANIFEST="gen/android/app/src/main/AndroidManifest.xml"
+
+if [ ! -f "$MANIFEST" ]; then
+  echo "ERROR: $MANIFEST not found. Run 'tauri android init' first." >&2
+  exit 1
+fi
+
+if grep -q 'android.permission.CAMERA' "$MANIFEST"; then
+  echo "CAMERA permission already present in AndroidManifest.xml"
+  exit 0
+fi
+
+echo "Adding CAMERA permission to AndroidManifest.xml..."
+sed -i 's|<uses-permission android:name="android.permission.INTERNET" />|<uses-permission android:name="android.permission.INTERNET" />\n    <uses-permission android:name="android.permission.CAMERA" />\n    <uses-feature android:name="android.hardware.camera" android:required="false" />\n    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />|' "$MANIFEST"
+echo "Done."

apps/web/src/components/camera-capture.tsx

@@ -0,0 +1,202 @@
+import { useRef, useState, useCallback, useEffect } from "react";
+import { SwitchCamera, CameraOff, Aperture } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+interface CameraCaptureProps {
+  onCapture: (file: File) => void;
+  onClose: () => void;
+}
+
+type FacingMode = "environment" | "user";
+
+export function CameraCapture({ onCapture, onClose }: CameraCaptureProps) {
+  const videoRef = useRef<HTMLVideoElement | null>(null);
+  const streamRef = useRef<MediaStream | null>(null);
+  const canvasRef = useRef<HTMLCanvasElement | null>(null);
+  const [facingMode, setFacingMode] = useState<FacingMode>("environment");
+  const [status, setStatus] = useState<"loading" | "ready" | "error" | "denied">("loading");
+  const [errorMsg, setErrorMsg] = useState<string>("");
+
+  const stopStream = useCallback(() => {
+    if (streamRef.current) {
+      streamRef.current.getTracks().forEach((t) => t.stop());
+      streamRef.current = null;
+    }
+  }, []);
+
+  const startCamera = useCallback(
+    async (mode: FacingMode) => {
+      stopStream();
+      setStatus("loading");
+      setErrorMsg("");
+
+      try {
+        const stream = await navigator.mediaDevices.getUserMedia({
+          video: {
+            facingMode: mode,
+            width: { ideal: 1920 },
+            height: { ideal: 1080 },
+          },
+          audio: false,
+        });
+
+        streamRef.current = stream;
+        if (videoRef.current) {
+          videoRef.current.srcObject = stream;
+          await videoRef.current.play();
+        }
+        setStatus("ready");
+      } catch (err: unknown) {
+        const e = err as DOMException;
+        if (e.name === "NotAllowedError" || e.name === "PermissionDeniedError") {
+          setStatus("denied");
+          setErrorMsg("Izin kamera ditolak. Buka pengaturan untuk mengizinkan akses kamera.");
+        } else if (e.name === "NotFoundError") {
+          setStatus("error");
+          setErrorMsg("Kamera tidak ditemukan pada perangkat ini.");
+        } else if (e.name === "NotReadableError") {
+          setStatus("error");
+          setErrorMsg("Kamera sedang digunakan oleh aplikasi lain.");
+        } else {
+          setStatus("error");
+          setErrorMsg(`Gagal mengakses kamera: ${e.message}`);
+        }
+      }
+    },
+    [stopStream],
+  );
+
+  // Start camera on mount
+  useEffect(() => {
+    startCamera(facingMode);
+    return () => stopStream();
+  }, []); // eslint-disable-line react-hooks/exhaustive-deps
+
+  const toggleFacing = () => {
+    const next = facingMode === "environment" ? "user" : "environment";
+    setFacingMode(next);
+    startCamera(next);
+  };
+
+  const handleCapture = () => {
+    const video = videoRef.current;
+    const canvas = canvasRef.current;
+    if (!video || !canvas) return;
+
+    const vw = video.videoWidth;
+    const vh = video.videoHeight;
+    canvas.width = vw;
+    canvas.height = vh;
+
+    const ctx = canvas.getContext("2d");
+    if (!ctx) return;
+
+    ctx.drawImage(video, 0, 0, vw, vh);
+    canvas.toBlob(
+      (blob) => {
+        if (!blob) return;
+        const file = new File([blob], `camera-${Date.now()}.jpg`, {
+          type: "image/jpeg",
+        });
+        stopStream();
+        onCapture(file);
+      },
+      "image/jpeg",
+      0.92,
+    );
+  };
+
+  return (
+    <div className="flex flex-col items-center gap-3 w-full">
+      {/* Viewfinder */}
+      <div className="relative w-full rounded-xl overflow-hidden bg-black aspect-[4/3] max-h-[420px]">
+        {status === "loading" && (
+          <div className="absolute inset-0 flex items-center justify-center bg-black/80 text-white">
+            <div className="flex flex-col items-center gap-2">
+              <div className="h-8 w-8 border-2 border-white border-t-transparent rounded-full animate-spin" />
+              <span className="text-sm">Membuka kamera...</span>
+            </div>
+          </div>
+        )}
+
+        {(status === "error" || status === "denied") && (
+          <div className="absolute inset-0 flex items-center justify-center bg-black/90 text-white p-6">
+            <div className="flex flex-col items-center gap-3 text-center">
+              <CameraOff className="text-red-400" size={40} />
+              <p className="text-sm text-red-300">{errorMsg}</p>
+              <Button
+                variant="outline"
+                className="h-9 px-3 text-sm text-white border-white/30 hover:bg-white/10"
+                onClick={() => startCamera(facingMode)}
+              >
+                Coba Lagi
+              </Button>
+            </div>
+          </div>
+        )}
+
+        <video
+          ref={videoRef}
+          autoPlay
+          playsInline
+          muted
+          className={`w-full h-full object-cover ${status === "ready" ? "opacity-100" : "opacity-0"}`}
+        />
+
+        {/* Scan area overlay */}
+        {status === "ready" && (
+          <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
+            <div className="absolute inset-0 bg-black/20" />
+            <div
+              className="relative flex items-center justify-center"
+              style={{ width: "70%", height: "75%" }}
+            >
+              <div className="absolute top-0 left-0 w-6 h-6 border-t-2 border-l-2 border-lime-300" />
+              <div className="absolute top-0 right-0 w-6 h-6 border-t-2 border-r-2 border-lime-300" />
+              <div className="absolute bottom-0 left-0 w-6 h-6 border-b-2 border-l-2 border-lime-300" />
+              <div className="absolute bottom-0 right-0 w-6 h-6 border-b-2 border-r-2 border-lime-300" />
+              <div className="text-white text-center flex flex-col gap-1">
+                <span className="text-xs font-semibold tracking-widest">
+                  AREA SCAN
+                </span>
+              </div>
+            </div>
+          </div>
+        )}
+      </div>
+
+      {/* Controls */}
+      <div className="flex items-center justify-center gap-4 w-full">
+        <Button
+          variant="outline"
+          className="rounded-full h-12 w-12 p-0"
+          onClick={onClose}
+          title="Tutup kamera"
+        >
+          <CameraOff size={20} />
+        </Button>
+
+        <Button
+          className="rounded-full h-16 w-16 p-0 bg-white border-4 border-green-500 hover:bg-green-50"
+          onClick={handleCapture}
+          disabled={status !== "ready"}
+          title="Ambil foto"
+        >
+          <Aperture className="text-green-600" size={32} />
+        </Button>
+
+        <Button
+          variant="outline"
+          className="rounded-full h-12 w-12 p-0"
+          onClick={toggleFacing}
+          title="Ganti kamera"
+        >
+          <SwitchCamera size={20} />
+        </Button>
+      </div>
+
+      {/* Hidden canvas for capture */}
+      <canvas ref={canvasRef} className="hidden" />
+    </div>
+  );
+}

apps/web/src/pages/scan-page.tsx

@@ -1,4 +1,4 @@
-import { useRef, useState } from "react";
+import { useRef, useState, useCallback } from "react";
 import { useNavigate, Link } from "react-router-dom";
 import { useMutation, useQueryClient, useQuery } from "@tanstack/react-query";
 import {
@@ -19,6 +19,7 @@ import type { DiagnosisRecord } from "@zeavis/shared";
 import { apiClient } from "@/lib/api-client";
 import { trackScan, trackDiagnosisResult } from "@/lib/telemetry";
 import { DiagnosisResultView } from "../components/diagnose-result-view";
+import { CameraCapture } from "../components/camera-capture";
 
 export function ScanPage() {
   const [fileName, setFileName] = useState<string | null>(null);
@@ -32,6 +33,24 @@ export function ScanPage() {
   const navigate = useNavigate();
   const queryClient = useQueryClient();
 
+  // Camera mode state
+  const [useCamera, setUseCamera] = useState(false);
+  const handleCameraCapture = useCallback(
+    (file: File) => {
+      setFileName(file.name);
+      const url = URL.createObjectURL(file);
+      setPreviewUrl(url);
+
+      const img = new Image();
+      img.onload = () => {
+        setImageDimensions({ width: img.width, height: img.height });
+      };
+      img.src = url;
+      setUseCamera(false);
+    },
+    [],
+  );
+
   const mutation = useMutation({
     mutationFn: (file: File) => apiClient.createDiagnosis(file),
     onSuccess: (diagnosis) => {
@@ -111,33 +130,70 @@ export function ScanPage() {
 
               {!previewUrl ? (
                 <div className="space-y-3">
-                  <div
-                    className="w-full border-2 border-dashed border-green-300 rounded-md p-10 h-60 text-center cursor-pointer"
-                    onClick={() => inputRef.current?.click()}
-                  >
-                    <Upload className="mx-auto text-green-500 mb-3" size={48} />
-                    <h3 className="font-semibold text-base text-gray-800 mb-1">
-                      Seret & Lepas Foto Daun
-                    </h3>
-                    <p className="text-xs text-gray-500 mb-3">
-                      atau klik untuk memilih file berkas dari perangkat Anda
-                    </p>
-                    <div className="flex flex-wrap gap-2 justify-center">
-                      <div className="bg-green-100 text-green-700 px-3 py-1 rounded-full inline-flex items-center gap-1 text-xs font-medium">
-                        <Check size={14} /> PNG, JPG, JPEG, WEBP
-                      </div>
-                      <div className="bg-green-100 text-green-700 px-3 py-1 rounded-full inline-flex items-center gap-1 text-xs font-medium">
-                        <Check size={14} /> Maks. 5 MB
-                      </div>
-                    </div>
+                  {/* Mode toggle */}
+                  <div className="flex rounded-lg bg-gray-100 p-1">
+                    <button
+                      type="button"
+                      onClick={() => setUseCamera(false)}
+                      className={`flex-1 py-2 px-3 rounded-md text-sm font-medium transition-colors ${
+                        !useCamera
+                          ? "bg-white text-green-700 shadow-sm"
+                          : "text-gray-500 hover:text-gray-700"
+                      }`}
+                    >
+                      <Upload size={16} className="inline mr-1.5" />
+                      Unggah
+                    </button>
+                    <button
+                      type="button"
+                      onClick={() => setUseCamera(true)}
+                      className={`flex-1 py-2 px-3 rounded-md text-sm font-medium transition-colors ${
+                        useCamera
+                          ? "bg-white text-green-700 shadow-sm"
+                          : "text-gray-500 hover:text-gray-700"
+                      }`}
+                    >
+                      <Camera size={16} className="inline mr-1.5" />
+                      Kamera
+                    </button>
                   </div>
-                  <button
-                    type="button"
-                    onClick={() => inputRef.current?.click()}
-                    className="w-full bg-green-600 hover:bg-green-700 text-white font-medium py-2.5 px-4 rounded-lg transition-colors flex items-center justify-center gap-2"
-                  >
-                    <Upload size={18} /> Pilih Berkas
-                  </button>
+
+                  {useCamera ? (
+                    <CameraCapture
+                      onCapture={handleCameraCapture}
+                      onClose={() => setUseCamera(false)}
+                    />
+                  ) : (
+                    <>
+                      <div
+                        className="w-full border-2 border-dashed border-green-300 rounded-md p-10 h-60 text-center cursor-pointer"
+                        onClick={() => inputRef.current?.click()}
+                      >
+                        <Upload className="mx-auto text-green-500 mb-3" size={48} />
+                        <h3 className="font-semibold text-base text-gray-800 mb-1">
+                          Seret & Lepas Foto Daun
+                        </h3>
+                        <p className="text-xs text-gray-500 mb-3">
+                          atau klik untuk memilih file berkas dari perangkat Anda
+                        </p>
+                        <div className="flex flex-wrap gap-2 justify-center">
+                          <div className="bg-green-100 text-green-700 px-3 py-1 rounded-full inline-flex items-center gap-1 text-xs font-medium">
+                            <Check size={14} /> PNG, JPG, JPEG, WEBP
+                          </div>
+                          <div className="bg-green-100 text-green-700 px-3 py-1 rounded-full inline-flex items-center gap-1 text-xs font-medium">
+                            <Check size={14} /> Maks. 5 MB
+                          </div>
+                        </div>
+                      </div>
+                      <button
+                        type="button"
+                        onClick={() => inputRef.current?.click()}
+                        className="w-full bg-green-600 hover:bg-green-700 text-white font-medium py-2.5 px-4 rounded-lg transition-colors flex items-center justify-center gap-2"
+                      >
+                        <Upload size={18} /> Pilih Berkas
+                      </button>
+                    </>
+                  )}
                 </div>
               ) : (
                 <div className="space-y-4">