feat(create): rebuild /create as a consolidated builder studio

[mehdibha]

Fresh, clean rebuild of the /create builder that consolidates the best ideas from the bake-off experiments (#282–#296, #212). Draft — built step by step: this first step lands the app shell; the panels are intentionally empty and get filled in subsequent commits so the work stays clean.

This step — shell + header + empty panels

• /create is now its own focused workspace. The global site <Header> is suppressed on /create only (every other route keeps it) — www/src/routes/_app/route.tsx.
• New app-shell header (modules/create/studio/header.tsx): visually continuous with the site bar (same --header-height, theme toggle, GitHub), but the marketing nav + "Search docs" are gone. The wordmark is a wayfinding menu (Home, Docs, Components, Charts, Presets) so the "customize here → see it on real components there" loop stays one click away without nav-link clutter. The ⌘K command / undo / share / export controls join this bar as the panels that back them land.
• Empty placeholder panels — customize-panel.tsx (controls) and stage.tsx (live preview) — clean empty states for now.
• Preset state plumbing (useDesignSystem, localStorage persistence) is preserved so the design-system loop keeps working as panels come online.
• Removes the old customizer-panel.tsx (replaced).

Design decisions (from the just-finished bake-off review)

• Drop the docs search bar in the builder (it searched docs); ⌘K will be repurposed to the builder command palette.
• Don't fully strip wayfinding — keep a one-click path back to Docs/Components via the logo menu (the preset re-themes those pages).

Next steps

Fill the panels one at a time: color → foundations → components on the left, live preview + toolbar on the right; then the header's builder-action cluster.

pnpm typecheck + pnpm check green.

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Project	Deployment	Actions	Updated (UTC)
dotui	Ready	Preview, Comment	Jun 28, 2026 2:45am