docs(sessions): add captured screenshot for session start dropdown (PR G)

Captures the planned screenshot × 4 languages (4 PNGs):
- session_start_dropdown.png — Launcher's Launch dropdown + Multiple Sessions dialog with the Number of sessions input (FR-2324 / #6045)

Framing note: clicking "Launch Multiple Sessions" opens a dialog (not an inline dropdown input), which is what the doc prose actually describes; filename preserved per the existing doc reference.

Captured at 2× zoom via Portless dev, per-locale via window.switchLanguage().

Author: yomybaby

packages/backend.ai-webui-docs/src/en/images/session_start_dropdown.png

@@ -44,6 +44,6 @@ refer to [Session Scheduling History](#session-scheduling-history).
 The **Launch** button on the session launcher creates one session by default.
 To launch several sessions with the same configuration in one go, click the
 more (`...`) icon next to the **Launch** button to open its dropdown menu and
-select **Launch Multiple Sessions**. See [Confirm and Launch](#confirm-and-launch)
+select **Launch Multiple Sessions**. See [Confirm and Launch](../sessions_all/sessions_all.md#confirm-and-launch)
 for details.
 :::

packages/backend.ai-webui-docs/src/en/session_page/session_page.md

@@ -229,7 +229,7 @@ If you are done with the network setting, click the 'Next' button below, or
 On the last page, users could view information of session(s) to create,
 such as environment itself, allocated resources, mount information,
 environment variables set on the previous pages, preopen ports, etc.,
-Review the settings, users could launch the session by clicking the 'Launch' button.
+Review the settings, then click the 'Launch' button to launch the session.
 Click the 'Edit' button located at the top right of each card to redirect to relevant page.
 
 ![](../images/launch_session_confirm.png)
@@ -242,7 +242,6 @@ the resources shown on the form. The single-click 'Launch' action still starts
 one session by default.
 
 ![](../images/session_start_dropdown.png)
-<!-- TODO: Capture screenshot of the start button dropdown showing "Launch Multiple Sessions" -->
 
 :::note
 Concurrent session launch is capped by the system; if the requested total

packages/backend.ai-webui-docs/src/en/sessions_all/sessions_all.md

@@ -40,5 +40,5 @@ Backend.AI Manager v26.2.0以降では、セッション詳細パネルから各
 セッションランチャーの**ローンチ**ボタンは、既定で 1 つのセッションを作成します。
 同一の設定で複数のセッションを一度に起動するには、**ローンチ**ボタンの隣にある
 その他(`...`)アイコンをクリックしてドロップダウンメニューを開き、**複数セッションを起動**
-を選択します。詳細は[確認と起動](#confirm-and-launch)セクションを参照してください。
+を選択します。詳細は[確認と起動](../sessions_all/sessions_all.md#confirm-and-launch)セクションを参照してください。
 :::

packages/backend.ai-webui-docs/src/ja/images/session_start_dropdown.png

@@ -230,7 +230,6 @@ Backend.AI WebUIで最もよく利用されるページは、「セッション
 「ローンチ」ボタンを単にクリックした場合は、既定で 1 つのセッションのみが起動します。
 
 ![](../images/session_start_dropdown.png)
-<!-- TODO: Capture screenshot of the start button dropdown showing "複数セッションを起動" -->
 
 :::note
 同時セッション起動はシステムによって制限されます。要求された合計が残りのセッション

packages/backend.ai-webui-docs/src/ja/session_page/session_page.md

@@ -38,5 +38,5 @@ Backend.AI Manager v26.2.0부터 세션 상세 정보 패널에서 각 세션의
 :::note
 세션 런처의 **시작** 버튼은 기본적으로 한 개의 세션을 생성합니다. 동일한 설정으로
 여러 세션을 한 번에 시작하려면 시작 버튼의 드롭다운 메뉴를 열고 **복수 세션 동시 시작**
-을 선택합니다. 자세한 내용은 [검토 및 시작](#confirm-and-launch) 섹션을 참고하세요.
+을 선택합니다. 자세한 내용은 [검토 및 시작](../sessions_all/sessions_all.md#confirm-and-launch) 섹션을 참고하세요.
 :::

packages/backend.ai-webui-docs/src/ja/sessions_all/sessions_all.md

@@ -159,7 +159,6 @@ Backend.AI WebUI 에서 가장 많이 방문하게 될 페이지는 세션 페
 값으로 한 개의 세션만 시작됩니다.
 
 ![](../images/session_start_dropdown.png)
-<!-- TODO: Capture screenshot of the start button dropdown showing "복수 세션 동시 시작" -->
 
 :::note
 동시 세션 생성은 시스템 정책에 의해 제한됩니다. 요청한 총 세션 수가 남은 동시 세션