[Kanti]

Selecting a component opens its Docs overview with shared documentation and variant previews. Outside Production, the documentation uses the same persistent editor as the variant inspector's Documentation tab, with Save, Reset, source mode, the text-style dropdown and highlighted code blocks. It inherits #62's two-row formatting toolbar with PhpStorm-style heading names, checked style previews and a grouped Lists menu, Reset fallback after editor initialization failure, one private root package for build tooling and tests in Playwright/src/ and Tests/browser/, TYPO3-style Node/browser runner conventions, and automatic bundle reproducibility checks. Production displays rendered documentation without loading the editor.

This is the alternative to #49, stacked on #62 (the alternative to #44). The original #44 → #49 stack remains available for comparison.

• Clicking a component-tree folder selects its first descendant component and opens that component's Docs overview, including nested folders and components without fixture variants.
• Empty documentation can be created directly in the overview, including components without fixture variants. Opening the view does not create a file.
• Save/Reset, toolbar Ctrl/Cmd+S, revision conflicts and unsaved-change protection use the existing documentation workflow. The Overview exposes the assigned live-reload URI to the existing shared EventSource watcher. External documentation changes refresh clean documents; fixture changes refresh every preview while unsaved documentation stays intact. Pending documentation changes are fetched after Reset makes the editor clean.
• Long documentation starts collapsed with a fade and expands on focus for editing, including when a short document grows beyond the collapse limit. Its actions remain outside the collapsed content.
• The overview imports and renders the content-navigation toggle only on TYPO3 14+, matching the inspector's version guard.
• Overview variant-title links select their variant through the existing tree navigation and TYPO3 content container, preserving site and language. Filtered-out variants clear the active search through TYPO3 Tree's existing resetFilter() API and synchronize the toolbar input after navigation approval. The navigation waits for TYPO3 13's asynchronous reload even though its reset API returns no promise. Cancelling an Overview link leaves the filter, visible nodes, selection and saved state untouched; ordinary tree-click cancellation still restores the previous selection. State is persisted only after approval. Discard approval covers the ensuing iframe unload so one click produces one navigation and one confirmation.
• The sticky Reset/Save/source-toggle row uses the overview's opaque theme background and sticks at the viewport top, without the inspector tab-header offset.
• The overview and inspector share typography, link and inline-code colors, list markers and language highlighting. Fluid code blocks inherit [FEATURE] Add a documentation editor to the Documentation tab #62's dedicated tokenizer and match the PHP inspector's tokens and theme colors; HTML/XML remains a separate language.
• Variant previews retain fixture declaration order, lazy loading, resizing and site/language context. The preview view and Docs frames use the requested light/dark conic background, with Docs frame padding clamp(0.7rem, 1.5vw, 1rem). Transparent Docs iframe canvases show one continuous grid across the frame and its padding. Live Controls beneath the first preview affect only that preview; variant titles open their inspectors.

Related: #24. Merge #62 before retargeting this PR to main.

• Overview browser and JavaScript regression tests live in Tests/browser/, and the overview template is Overview.fluid.html. Contributor documentation and AGENTS.md inherit [FEATURE] Add a documentation editor to the Documentation tab #62's explicit test-placement and public-package rules.