Restructure dashboard sharing page to include export and embed info

[florent-leborgne]

Closes #5590

Summary

The Share dashboards page only covered link sharing and NDJSON export. Users couldn't find information about PDF/PNG export, embedding, or CSV download — all of which existed only on the general Reporting and sharing page without clear cross-referencing.

Changes

explore-analyze/dashboards/sharing.md (main change):

• Renamed the page from "Sharing dashboards" to "Share and export dashboards"
• Added a table-of-contents-style intro listing all available options
• Restructured into clear, self-contained sections:
  1. Manage access permissions — existing content, kept with snippet include
  2. Share with a link — now self-contained with time range options (relative vs absolute), tips, and anonymous access info (previously users had to navigate to the reporting page)
  3. Embed in a webpage (serverless: unavailable) — new section with step-by-step instructions and embed options (Top menu, Query, Time filter, Filter bar); includes a TODO placeholder for a screenshot
  4. Export as PDF or PNG (serverless: unavailable) — new section covering PDF/PNG report generation, print format option, and scheduling; links to the reporting page for advanced configuration and limitations
  5. Download visualization data as CSV — new section explaining how to download Lens visualization data as CSV
  6. Export dashboard configuration — renamed from "Export dashboards" for clarity; same NDJSON content
• Each section includes correct applies_to availability markers (serverless unavailable for embed, PDF, PNG)
• Updated frontmatter: added navigation_title, updated description

explore-analyze/report-and-share.md:

• Added cross-reference to the dashboard sharing page from the "Export as a file" section
• Added cross-reference to the dashboard embed instructions from the "Embed code" bullet

explore-analyze/dashboards.md:

• Updated the link text and description to match the new page title

Verified against the Kibana codebase

All UI labels, options, and behavior were verified against the Kibana source:

• Share dialog tabs: Link and Embed (from share_tabs.tsx)
• Embed checkboxes and defaults (from show_share_modal.tsx and _dashboard_app_strings.ts)
• Export options: PDF with "Print format" switch, PNG (from pdf_export_config.tsx, share_options_utils.ts)
• CSV download from Lens (from csv_download_provider.tsx)
• Serverless restrictions: embed filtered out in share_menu_registry.ts, PDF/PNG disabled by default in config_schema.ts

Test plan

• Preview the restructured sharing page and verify it reads well
• Verify all internal links resolve correctly
• Verify the cross-references from report-and-share.md work
• Confirm applies_to markers render correctly for serverless vs stack
• Add screenshot for the embed tab (marked as TODO)

Made with Cursor

[github-actions]

Vale Linting Results

Summary: 2 suggestions found

💡 Suggestions (2)

File	Line	Rule	Message
explore-analyze/dashboards/sharing.md	93	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
explore-analyze/dashboards/sharing.md	132	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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[github-actions]

🔍 Preview links for changed docs

• explore-analyze/dashboards.md
• explore-analyze/dashboards/sharing.md
• explore-analyze/report-and-share.md