fix: move Chromium download to Docker build phase

- Download Chromium from Google snapshots during Docker build (network works there)
- Chroot hook now only verifies and installs runtime dependencies
- Remove generated files from repo (OVMF_VARS.fd, qemu.pid, screenshots)
- Update isotest scripts to use .nogit/ directory structure
- Chromium kiosk verified working with Sway compositor

isobuild/Dockerfile

@@ -51,6 +51,20 @@ COPY ecoos_daemon/ /daemon/
 # Bundle the daemon
 RUN cd /daemon && deno compile --allow-all --output /build/daemon-bundle/eco-daemon mod.ts
 
+# Download Chromium during Docker build (network works here, not in chroot hooks)
+RUN echo "Downloading Chromium from official snapshots..." && \
+    cd /tmp && \
+    LATEST=$(curl -fsSL "https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Linux_x64%2FLAST_CHANGE?alt=media" 2>/dev/null || echo "1368529") && \
+    echo "Using Chromium build: $LATEST" && \
+    curl -fsSL "https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Linux_x64%2F${LATEST}%2Fchrome-linux.zip?alt=media" -o chromium.zip || \
+    curl -fsSL "https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Linux_x64%2F1368529%2Fchrome-linux.zip?alt=media" -o chromium.zip && \
+    mkdir -p /build/chromium && \
+    unzip -q chromium.zip -d /tmp && \
+    mv /tmp/chrome-linux/* /build/chromium/ && \
+    rm -rf chromium.zip /tmp/chrome-linux && \
+    chmod +x /build/chromium/chrome && \
+    echo "Chromium downloaded to /build/chromium/"
+
 # Make scripts executable
 RUN chmod +x /build/scripts/*.sh
 
@@ -102,6 +116,22 @@ mkdir -p config/includes.chroot/etc/systemd/system
 cp /build/daemon-bundle/eco-daemon config/includes.chroot/opt/eco/bin/
 chmod +x config/includes.chroot/opt/eco/bin/eco-daemon
 
+# Copy pre-downloaded Chromium
+echo "Installing pre-downloaded Chromium into chroot..."
+mkdir -p config/includes.chroot/opt/chromium
+cp -r /build/chromium/* config/includes.chroot/opt/chromium/
+chmod +x config/includes.chroot/opt/chromium/chrome
+
+# Create symlinks for chromium-browser command
+mkdir -p config/includes.chroot/usr/bin
+cat > config/includes.chroot/usr/bin/chromium-browser << 'CHROMEWRAPPER'
+#!/bin/sh
+exec /opt/chromium/chrome "$@"
+CHROMEWRAPPER
+chmod +x config/includes.chroot/usr/bin/chromium-browser
+ln -sf /opt/chromium/chrome config/includes.chroot/usr/bin/chromium
+echo "Chromium installed to /opt/chromium/"
+
 # Create dummy isohybrid in chroot (UEFI-only, no BIOS boot record)
 mkdir -p config/includes.chroot/usr/bin
 cat > config/includes.chroot/usr/bin/isohybrid << 'ISOHYBRID'