Copy URL to clipboard from Chromium apps (#1458)

* Copy current URL to clipboard with browser extension

In Omarchy web apps it's impossible to get the curent URL to share it in
another applications. This commit adds a browser extension which is
included by default via the chromium-flags.conf config. With this
extension you can get the current URL via a keyboard shortcut.

The default shortcut for getting the current URL is `Ctrl+Shift+L`, this
shortcut can be changed via this page: chrome://extensions/shortcuts.

* Change the shortcut to Alt+Shift+L

In my testing and research I found out that not all shortcuts
are available as suggested_key. We still want to use L because
that's easy to remember because we associate it with the location bar.

* Improve notification language

* Move it to just Alt + L since that's not used

Better mirrors Ctrl + L as well

* Move this under default/chromium

* Fix symlink

* It didn't like Alt+L alone after all

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

default/chromium/extensions/copy-url/manifest.json

@@ -0,0 +1,19 @@
+{
+  "manifest_version": 4,
+  "name": "Copy URL",
+  "version": "1.0",
+  "description": "Copy current URL to clipboard, this extension is installed by Omarchy",
+  "permissions": ["activeTab", "scripting", "notifications"],
+  "icons": {
+    "16": "icon.png",
+    "48": "icon.png",
+    "128": "icon.png"
+  },
+  "commands": {
+    "copy-url": {
+      "suggested_key": {"default": "Alt+Shift+L"},
+      "description": "Copy URL"
+    }
+  },
+  "background": {"service_worker": "background.js"}
+}