docs(automation-testing): add device-only view page (KOB-54076)

[tiffany-kobiton]

Summary

New public docs page for the Device-only view feature (release 4.27), plus a companion cross-reference from the mixed-session page.

• Adds docs/modules/automation-testing/pages/device-only-view.adoc
• Inserts nav entry directly after start-a-mixed-session.adoc
• Adds a bottom `See also` section to start-a-mixed-session.adoc linking to the new page

Scope

Documents what actually shipped in KOB-52769 (Phase 1 device-only view):

• URL-param activation (`?view=device-only` on live device launch URLs)
• Strict-equality param matching
• Device coverage (Android/iOS, phones/tablets, portrait/landscape)
• Live-session-only scope (no historical playback)
• Floating exit button with Appium-aware tooltip
• Canvas touch/swipe forwarding (per KOB-53093 revision)
• Session recording behavior (unchanged, remains mixed-session)

Deliberately excluded per shipped scope:

• MCP fields `liveViewUrl` / `deviceOnlyViewUrl` on `getSession` / `getSessionArtifacts` — scope-reduced per KOB-52769 QA sign-off; `kobiton/api#5017` was closed. The automate skill constructs the URL from `deviceId` client-side.
• Canvas capture MCP tool (`getUserInputEvents`) — covered by separate docs ticket KOB-54072 / KOB-53093.

Source

• Jira: KOB-54076 (docs ticket)
• Feature story: KOB-52769
• Canvas capture (separate docs ticket): KOB-53093
• Confluence draft: https://kobiton.atlassian.net/wiki/spaces/KOBITON/pages/4984701063

Test plan

• Confirm nav ordering renders correctly (new bullet directly after Start a mixed session)
• Confirm the See also xref renders on the mixed-session page
• SME check: URL placeholder syntax (`` / ``) matches Kobiton customer-docs convention
• Follow-on ticket to consider: once KOB-54072 (canvas capture doc) lands, add a xref from the Canvas input section here

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