fix(web): update-all skips Starlark apps and no longer misses plugins (#587)

* fix(web): update-all skips Starlark apps and no longer misses plugins

Check & Update All posted every entry from /plugins/installed to
POST /plugins/update, including the virtual starlark:<app_id> entries
that list installed Starlark apps. The store manager cannot find those,
so each answered 500 "plugin not found". Update-all now sends only
plugin ids (install_manager.js, and the older app-shell.js copy), and the
route answers a starlark: id with a 400 saying it is a Starlark app.

A request that got no HTTP answer was recorded as failed and never sent
again. On a device, a web-service restart mid-run killed the in-flight
request and refused the next one, stock-news, which was left on 2.6.2
with 2.8.0 available. Such requests are now re-sent with backoff
(about 30s) before being reported as failed. HTTP error answers are not
retried.

Tests: test/js/unit/test_update_all.js (run from pytest via
test/web_interface/test_update_all_plugins.py so CI covers it) and the
route contract for starlark: ids.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* refactor(web): walk update-all retry delays without indexed lookup

Codacy's ESLint security/detect-object-injection rule flagged
retryDelays[attempt] as a High issue. The index was a bounded loop
counter over a fixed array, but shifting a per-plugin copy of the
schedule gives the same backoff without the pattern. No behaviour
change: test/js/unit/test_update_all.js (21) and
test/web_interface/test_update_all_plugins.py (7) pass unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

web_interface/blueprints/api_v3/plugins.py

@@ -943,6 +943,19 @@ def update_plugin():
                 )
             data = {'plugin_id': plugin_id}
 
+        # /plugins/installed lists installed Starlark apps as virtual
+        # 'starlark:<app_id>' entries. They are not plugin directories, so the
+        # store manager can only fail to find them -- which used to surface as
+        # a 500 "plugin not found" for an app that is installed and working.
+        raw_id = data.get('plugin_id')
+        if isinstance(raw_id, str) and raw_id.startswith('starlark:'):
+            return error_response(
+                ErrorCode.INVALID_INPUT,
+                f'{raw_id} is a Starlark app, not a plugin; Starlark apps are '
+                'not updated through the plugin updater',
+                status_code=400
+            )
+
         if not api_v3.plugin_store_manager:
             return error_response(
                 ErrorCode.SYSTEM_ERROR,