feat(docs): add mobile-toc option to docs.yml layout config

[matlegault]

Summary

• Adds an opt-in mobile-toc boolean to the layout section of docs.yml, enabling a sticky collapsible table of contents bar on mobile viewports for guide and overview layout pages.
• Accompanies https://github.com/fern-api/fern-platform/pull/9736

Changes Made

• Added mobile-toc: optional<boolean> to LayoutConfig in the Fern API definition
• Added mobile-toc to the zod schema in DocsYmlSchemas.ts
• Added mobileToc to the API type interface and serialization layer
• Mapped mobileToc in parseDocsConfiguration.ts (defaults to false)
• Updated both JSON schema files with the new field

Test plan

• Verify layout: { mobile-toc: true } in docs.yml is parsed correctly
• Verify the field flows through to the write shape as mobileToc: true
• Verify omitting the field defaults to false

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SDK Generation Benchmark Results

Comparing PR branch against latest nightly baseline on main (2026-04-15T04:55:58Z).

Full benchmark table (click to expand)

Generator	Spec	main (generator)	main (E2E)	PR (generator)	Delta
csharp-sdk	square	93s	137s	95s	+2s (+2.2%)
go-sdk	square	104s	142s	105s	+1s (+1.0%)
java-sdk	square	160s	188s	157s	-3s (-1.9%)
php-sdk	square	85s	116s	87s	+2s (+2.4%)
python-sdk	square	111s	146s	114s	+3s (+2.7%)
ruby-sdk-v2	square	115s	154s	118s	+3s (+2.6%)
rust-sdk	square	99s	92s	94s	-5s (-5.1%)
swift-sdk	square	84s	124s	76s	-8s (-9.5%)
ts-sdk	square	100s	143s	104s	+4s (+4.0%)

main (generator): generator-only time via --skip-scripts (includes Docker image build, container startup, IR parsing, and code generation — this is the same Docker-based flow customers use via fern generate). main (E2E): full customer-observable time including build/test scripts (nightly baseline, informational). Delta is computed against generator-only baseline.
⚠️ = generation exited with a non-zero exit code (timing may not reflect a successful run).
Baseline from nightly runs on main (latest: 2026-04-15T04:55:58Z). Trigger benchmark-baseline to refresh.
Last updated: 2026-04-15 16:30 UTC

[github-actions]

Docs Generation Benchmark Results

Comparing PR branch against main baseline.

Fixture	main	PR	Delta
docs	N/A	312.1s (35 versions)	N/A

Docs generation runs fern generate --docs --preview end-to-end against the benchmark fixture with 35 API versions (each version: markdown processing + OpenAPI-to-IR + FDR upload).
Delta is computed against the nightly baseline on main.
Last updated: 2026-04-15 16:32 UTC