BTHLABS-58: Tweaks and fixes

* Use explicit values to populate access token's platform in apps.
* Fix View Association layout.
* Web Extension popup layout rework.

services/extension/tasks.py

@@ -4,9 +4,14 @@
 from __future__ import annotations
 
 import json
+import os
+import typing
 
 from invoke import Context, task
 from invoke.exceptions import UnexpectedExit
+import jinja2
+import werkzeug
+import werkzeug.routing
 
 from hotpocket_workspace_tools import get_workspace_mode
 from hotpocket_workspace_tools.tasks import *  # noqa: F401,F403
@@ -14,6 +19,61 @@ from hotpocket_workspace_tools.tasks import *  # noqa: F401,F403
 WORKSPACE_MODE = get_workspace_mode()
 
 
+class PreviewApp:
+    ROUTES = werkzeug.routing.Map([
+        werkzeug.routing.Rule('/preview/popup.html', endpoint='preview_popup'),
+    ])
+
+    def __init__(self):
+        here = os.path.dirname(__file__)
+        self.jinja_env = jinja2.Environment(
+            loader=jinja2.FileSystemLoader(
+                [
+                    os.path.join(here, 'src/content/templates'),
+                ],
+            ),
+            auto_reload=True,
+            autoescape=True,
+        )
+
+    @classmethod
+    def create_app(cls) -> typing.Self:
+        return cls()
+
+    def render_template(self,
+                        template_name: str,
+                        **context,
+                        ) -> werkzeug.Response:
+        template = self.jinja_env.get_template(template_name)
+        return werkzeug.Response(
+            template.render(context), mimetype='text/html',
+        )
+
+    def dispatch_request(self,
+                         request: werkzeug.Request,
+                         ) -> werkzeug.Response | Exception:
+        adapter = self.ROUTES.bind_to_environ(request.environ)
+        try:
+            endpoint, values = adapter.match()
+            return getattr(self, f'on_{endpoint}')(request, **values)
+        except werkzeug.exceptions.HTTPException as exception:
+            return exception
+
+    def on_preview_popup(self, request: werkzeug.Request) -> werkzeug.Response:
+        return self.render_template('popup_preview.html')
+
+    def wsgi_app(self,
+                 environ: werkzeug.wsgi.WSGIEnvironment,
+                 start_response: typing.Any,
+                 ) -> werkzeug.Response:
+        request = werkzeug.Request(environ)
+        response = self.dispatch_request(request)
+        return response(environ, start_response)
+
+    def __call__(self, environ, start_response):
+        return self.wsgi_app(environ, start_response)
+
+
 @task
 def clean(ctx: Context):
     ctx.run('rm -rf dist/')
@@ -107,7 +167,12 @@ def setup(ctx: Context):
 
 @task
 def start_web(ctx: Context):
-    raise NotImplementedError()
+    from werkzeug.serving import run_simple
+    app = PreviewApp.create_app()
+
+    bind = os.getenv('HOTPOCKET_EXTENSION_PREVIEW_BIND', '127.0.0.1:6524')
+    host, port = bind.split(':', maxsplit=1)
+    run_simple(host, int(port), app, use_debugger=True, use_reloader=True)
 
 
 @task