feat: Sentry User Feedback in backoffice (#178) (#180)

* feat: add Sentry User Feedback widget to backoffice (#178)

Install @sentry/browser via AssetMapper and initialize the feedback
integration on all backoffice pages. The CDN loader script is moved to
an overridable block so backoffice pages use the npm SDK without
double-initialising Sentry.

Sentry is initialised only when a DSN is configured (SENTRY_DSN env
var). When a user is logged in their email is pre-filled in the feedback
form via Sentry.setUser(); both name and email remain optional so
anonymous submissions are supported by simply leaving those fields empty.

* feat: add Spotlight sidecar for local Sentry development testing

Add the Spotlight container to compose.override.yaml so the feedback
widget and error events can be inspected locally without sending anything
to Sentry. The JS SDK switches to spotlight mode automatically when no
SENTRY_DSN is configured.

* feat: route PHP Sentry events to Spotlight in dev

Add a when@dev block to sentry.yaml that initialises the PHP Sentry SDK
with a placeholder DSN and forwards all events to the Spotlight sidecar
over the internal Docker network (http://spotlight:8969/stream).

The JS SDK already uses localhost:8969 via spotlight:true when no real
SENTRY_DSN is set, which is correct since the browser cannot reach the
internal Docker hostname.

* fix: use spotlight_url to route PHP dev errors to Spotlight sidecar

* fix: manually mount Sentry feedback widget to work around v10 setupOnce guard

Sentry v10's setupOnce() is skipped when the integration name is already
in the module-level guard array, so autoInject never mounts the widget.
Switching to autoInject: false and calling createWidget() directly is
reliable and confirmed working in the browser.

Also use the tunnel option to forward JS events to the local Spotlight
sidecar when no real DSN is configured, and enable SentryBundle in dev
so PHP errors are also routed to Spotlight.

config/bundles.php

@@ -30,7 +30,7 @@ return [
     TwigExtraBundle::class => ['all' => true],
     DoctrineFixturesBundle::class => ['dev' => true, 'test' => true],
     SymfonyCastsVerifyEmailBundle::class => ['all' => true],
-    SentryBundle::class => ['prod' => true],
+    SentryBundle::class => ['dev' => true, 'prod' => true],
     SymfonycastsSassBundle::class => ['all' => true],
     StimulusBundle::class => ['all' => true],
     TurboBundle::class => ['all' => true],