docs: fix session recap image path

[nielskaspers]

Fixes #24809.

The docs site is served with baseUrl: "/docs/", so an image src that starts with /img/... points to the wrong absolute path in production.

This updates the Sessions doc to resolve the static asset via useBaseUrl("/img/docs/session-recap.svg"), so the image loads correctly under /docs/.

[alt-glitch]

Duplicate of #24824, which also fixes #24809 with the more idiomatic useBaseUrl() Docusaurus approach. This PR hardcodes /docs/ prefix instead, which is brittle. Note: this PR additionally fixes cli-layout.svg in cli.md which #24824 does not cover — that fix could be cherry-picked into #24824.

[teknium1]

Thanks for the docs fix — this is already implemented on current main, so this PR is now safe to close as covered.

Evidence from this automated hermes-sweeper review:

• website/docs/user-guide/sessions.md:7 on current main imports useBaseUrl from @docusaurus/useBaseUrl.
• website/docs/user-guide/sessions.md:149 on current main renders the recap image with src={useBaseUrl('/img/docs/session-recap.svg')}.
• The implementing commit is 6891e05e78b67beac3ef4f2f5acbdbd24f4e9e7b (docs: fix session recap image baseUrl), which is contained in tag v2026.6.5.

The related report #24809 is also closed, and the useful prior discussion about duplicate fixes was accounted for.