feat(toolbar): add font family combobox

[caio-pizzol]

Adds an editable font family combobox to the built-in toolbar so users can type a font name, accept autocomplete with Tab or Enter, and move through the flow from font family to font size back into the editor.

Also fixes the editor input path used after toolbar-preserved selections. When typing over a visually preserved selection, SuperDoc now uses the preserved selection once, keeps ProseMirror native inline mark inheritance, and clears the preserved selection so replacement text keeps the chosen font and size without materializing style-derived marks.

Custom UI support is updated too: font-size picker options are now available through ui.fonts.getSizeOptions(), state.fonts.sizeOptions, and useSuperDocFontSizeOptions(). Docs and the configurable-toolbar example show the recommended path: use command state for current values, ui.toolbar.execute(...) for interactive toolbar mutations, and editor.doc.format.apply(...) for explicit target edits.

Commit structure:

• feat(toolbar): add font family combobox
• fix(editor): preserve formatting when typing over toolbar selection
• feat(ui): expose font size options

Review:

• Combobox replaces only font family. Other toolbar dropdowns stay on the shared dropdown.
• Editor fix is split into its own commit and only touches editable.js plus tests.
• Font-size options reuse the headless toolbar defaults. There is no third hand-maintained size list.
• Local unit tests were not run per repo rule. CI should run the new unit and behavior specs.

Verified:

• pnpm check:types
• pnpm check:public:superdoc
• pnpm --prefix apps/docs run check:imports
• pnpm --prefix apps/docs run test:examples
• pnpm --filter @superdoc-examples/custom-ui-configurable-toolbar build
• git diff --check
• node --check for the edited editor files
• Browser repro for font family to font size to editor typing flow
• Browser regression check for style-only replacement not gaining direct textStyle marks

[github-actions]

Agent docs audit

Found deterministic findings on 2 changed agent-doc item(s).

apps/docs/AGENTS.md (211 lines)

• over nested-warn (211 > 200)
• 5 broken path ref(s)
• 3 unresolved command(s)

Broken path refs:

• icon="/path/to/icon.svg"
• packages/superdoc/src/core/SuperDoc.js
• packages/superdoc/src/core/types/index.js
• superdoc/ui
• superdoc/ui/react

Unresolved pnpm commands (advisory):

• pnpm check:icons
• pnpm check:imports
• pnpm test:examples

tests/behavior/AGENTS.md (267 lines)

• over nested-warn (267 > 200)

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Deterministic L1 only: no AI, no Bash, no secrets. Semantic L2/L3 audit runs weekly on main. Policy: agent-docs-policy.md.

[chatgpt-codex-connector]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

📖 Docs preview: https://superdoc-caio-pizzol-font-family-combobox.mintlify.app

[linear-code]

SD-3411

SD-3410