refactor: rename Chrome references to Chromium

- Rename hook file: 0060-install-chrome -> 0060-install-chromium
- Update all logs and comments to say "Chromium" instead of "Chrome"
- Rename chromeStatus -> chromiumStatus in daemon
- Update UI to show "Chromium Browser" instead of "Chrome Browser"
- Update documentation (readme.plan.md, readme.hints.md)

Note: Binary paths (/opt/chromium/chrome) remain as the actual
Chromium executable is named "chrome"

readme.plan.md

@@ -44,7 +44,7 @@ When "Install EcoOS" is selected:
 When "EcoOS Live" is selected:
 1. Boots into RAM (squashfs)
 2. eco-daemon starts via systemd
-3. Sway + Chrome should start
+3. Sway + Chromium should start
 4. **No persistent storage** - changes lost on reboot
 
 ### After Installation (Normal Boot)
@@ -52,7 +52,7 @@ When "EcoOS Live" is selected:
 2. eco-daemon.service starts
 3. Daemon writes Sway config to `~/.config/sway/config`
 4. Daemon starts Sway compositor
-5. Daemon starts Chrome in kiosk mode pointing to localhost:3006
+5. Daemon starts Chromium in kiosk mode pointing to localhost:3006
 6. Management UI serves on port 3006
 
 ## Architecture
@@ -63,7 +63,7 @@ eco_os/
 │   └── ts/
 │       ├── daemon/
 │       │   ├── index.ts         # Main daemon orchestration
-│       │   ├── process-manager.ts # Sway/Chrome process control
+│       │   ├── process-manager.ts # Sway/Chromium process control
 │       │   └── system-info.ts   # CPU/memory stats
 │       └── ui/
 │           └── server.ts        # HTTP server + WebSocket
@@ -73,7 +73,7 @@ eco_os/
 │   │   ├── hooks/normal/       # Chroot hooks (MUST BE EXECUTABLE)
 │   │   │   ├── 0050-setup-ecouser.hook.chroot
 │   │   │   ├── 0055-fix-networkmanager.hook.chroot
-│   │   │   ├── 0060-install-chrome.hook.chroot  # Installs Chrome
+│   │   │   ├── 0060-install-chromium.hook.chroot  # Installs Chromium
 │   │   │   └── 0100-enable-services.hook.chroot
 │   │   ├── includes.chroot/    # Files copied into ISO
 │   │   │   ├── etc/
@@ -104,7 +104,7 @@ Features:
 - 1920x1080 resolution
 - No window borders
 - All windows forced fullscreen
-- Chrome app_id rules for fullscreen
+- Chromium app_id rules for fullscreen
 
 ### Chromium Launch
 Command: `chromium-browser` (or `chromium`)
@@ -117,7 +117,7 @@ Flags:
 
 ### Port 3006 Management UI
 - Serves HTML dashboard
-- Shows Sway/Chrome status
+- Shows Sway/Chromium status
 - Shows CPU/memory stats
 - Shows daemon logs
 - WebSocket for live updates
@@ -146,7 +146,7 @@ All files in `isobuild/config/hooks/normal/*.hook.chroot` MUST be executable:
 chmod +x isobuild/config/hooks/normal/*.hook.chroot
 ```
 
-If hooks aren't executable, Chrome won't be installed!
+If hooks aren't executable, Chromium won't be installed!
 
 ## Testing in QEMU