✨(front) add video conference link generation in event modal

Implement the visio conference feature in the event modal:
- Add NEXT_PUBLIC_VISIO_BASE_URL env var for configurable base URL
- Create generateVisioRoomId() utility (xxx-xxxx-xxx format, a-z)
- Refactor VideoConferenceSection: button to create, link + remove
  when URL exists
- Hide visio pill when env var is not configured (feature flag)
- Add removeVisio i18n key in EN/FR/NL

The visio URL is stored via the standard ICS URL property, which
is already wired through useEventForm.toIcsEvent() and CalDavService.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/frontend/apps/calendars/.env

@@ -1 +1,2 @@
 NEXT_PUBLIC_API_ORIGIN=
+NEXT_PUBLIC_VISIO_BASE_URL=https://visio.suite.anct.gouv.fr

src/frontend/apps/calendars/.env.development

@@ -1 +1,2 @@
 NEXT_PUBLIC_API_ORIGIN=http://localhost:8921
+NEXT_PUBLIC_VISIO_BASE_URL=https://visio.suite.anct.gouv.fr

src/frontend/apps/calendars/src/features/calendar/components/scheduler/EventModal.tsx

@@ -119,13 +119,19 @@ export const EventModal = ({
     }
   };
 
+  const visioBaseUrl = process.env.NEXT_PUBLIC_VISIO_BASE_URL;
+
   const pills = useMemo(
     () => [
-      {
-        id: "videoConference" as const,
-        icon: "videocam",
-        label: t("calendar.event.sections.addVideoConference"),
-      },
+      ...(visioBaseUrl
+        ? [
+            {
+              id: "videoConference" as const,
+              icon: "videocam",
+              label: t("calendar.event.sections.addVideoConference"),
+            },
+          ]
+        : []),
       {
         id: "location" as const,
         icon: "place",
@@ -147,7 +153,7 @@ export const EventModal = ({
         label: t("calendar.event.attendees"),
       },
     ],
-    [t],
+    [t, visioBaseUrl],
   );
 
   return (

src/frontend/apps/calendars/src/features/calendar/components/scheduler/event-modal-sections/VideoConferenceSection.tsx

@@ -1,7 +1,7 @@
-import { useState } from "react";
 import { useTranslation } from "react-i18next";
 import { Button } from "@gouvfr-lasuite/cunningham-react";
 import { SectionRow } from "./SectionRow";
+import { generateVisioRoomId } from "./generateVisioRoomId";
 
 interface VideoConferenceSectionProps {
   url: string;
@@ -19,14 +19,12 @@ export const VideoConferenceSection = ({
   onToggle,
 }: VideoConferenceSectionProps) => {
   const { t } = useTranslation();
-  const [isCreating, setIsCreating] = useState(false);
 
   const handleCreateVisio = () => {
-    // Inert for now - will integrate with La Suite API in the future
-    setIsCreating(true);
-    setTimeout(() => {
-      setIsCreating(false);
-    }, 500);
+    const baseUrl = process.env.NEXT_PUBLIC_VISIO_BASE_URL;
+    if (!baseUrl) return;
+    const roomId = generateVisioRoomId();
+    onChange(`${baseUrl}/${roomId}`);
   };
 
   const handleRemove = () => {
@@ -42,15 +40,35 @@ export const VideoConferenceSection = ({
       isExpanded={isExpanded}
       onToggle={onToggle}
     >
-      <Button
-        size="small"
-        color="neutral"
-        variant="tertiary"
-        onClick={handleCreateVisio}
-        disabled={isCreating}
-      >
-        {t("calendar.event.sections.createVisio")}
-      </Button>
+      {url ? (
+        <div style={{ display: "flex", alignItems: "center", gap: "8px" }}>
+          <a
+            href={url}
+            target="_blank"
+            rel="noopener noreferrer"
+            style={{ wordBreak: "break-all" }}
+          >
+            {url}
+          </a>
+          <Button
+            size="small"
+            color="neutral"
+            variant="tertiary"
+            icon={<span className="material-icons">close</span>}
+            onClick={handleRemove}
+            aria-label={t("calendar.event.sections.removeVisio")}
+          />
+        </div>
+      ) : (
+        <Button
+          size="small"
+          color="neutral"
+          variant="tertiary"
+          onClick={handleCreateVisio}
+        >
+          {t("calendar.event.sections.createVisio")}
+        </Button>
+      )}
     </SectionRow>
   );
 };

src/frontend/apps/calendars/src/features/calendar/components/scheduler/event-modal-sections/generateVisioRoomId.ts

@@ -0,0 +1,7 @@
+const randomLetters = (n: number): string =>
+  Array.from({ length: n }, () =>
+    String.fromCharCode(97 + Math.floor(Math.random() * 26)),
+  ).join("");
+
+export const generateVisioRoomId = (): string =>
+  `${randomLetters(3)}-${randomLetters(4)}-${randomLetters(3)}`;

src/frontend/apps/calendars/src/features/i18n/translations.json

@@ -137,6 +137,7 @@
             "addLocation": "Add location",
             "addVideoConference": "Visio",
             "createVisio": "Add video conference",
+            "removeVisio": "Remove video conference",
             "videoLink": "Video conference link",
             "addAttendees": "Add participants",
             "addDescription": "Add description",
@@ -747,6 +748,7 @@
             "addLocation": "Ajouter un lieu",
             "addVideoConference": "Visio",
             "createVisio": "Ajouter une visioconférence",
+            "removeVisio": "Supprimer la visioconférence",
             "videoLink": "Lien de visioconférence",
             "addAttendees": "Ajouter des participants",
             "addDescription": "Ajouter une description",
@@ -1104,6 +1106,7 @@
             "addLocation": "Locatie toevoegen",
             "addVideoConference": "Visio",
             "createVisio": "Add video conference",
+            "removeVisio": "Videoconferentie verwijderen",
             "videoLink": "Videoconferentie link",
             "addAttendees": "Deelnemers toevoegen",
             "addDescription": "Beschrijving toevoegen",