Add Cinematic guided simple builder, presets, and conditional UI for simple/advanced modes

[a5sh]

Motivation

• Provide a lightweight, guided onboarding flow for the simple builder mode so users can quickly pick a starting point and apply presets without opening the full advanced editor.
• Ship a set of reusable simple presets and tutorial steps to drive the guided flow and keep the live canvas in-sync with selections.
• Ensure the editor chrome (sidebars, mobile dock, zoom overlay) behaves correctly when in simple mode by hiding advanced panels and adjusting layout calculations.

Description

• Added a new CinematicTutorialBuilder React component at src/components/builder/simple/CinematicTutorialBuilder.tsx which implements a multi-step guided UI that updates the live PosterConfig and exposes onExport and onSwitchAdvanced hooks.
• Introduced preset definitions in src/components/builder/simple/presets.ts and guided flow configuration in src/components/builder/simple/tutorialSteps.ts used by the tutorial to apply configuration changes.
• Integrated the tutorial into the main layout by importing CinematicTutorialBuilder, adding renderSimpleBuilder, and rendering it over the canvas when builderMode === 'simple' and not fullscreen.
• Updated layout logic to conditionally render left/right sidebars, mobile panel, and MobileDock only when builderMode === 'advanced', and adjusted ZoomOverlay's rightSidebarWidth calculation to account for the mode.

Testing

• Ran TypeScript type-check with tsc --noEmit which completed successfully.
• Ran linting with eslint . which reported no new errors.
• Executed the test suite with yarn test and yarn build which both completed without failures.

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Codex Task

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	posterium-frontend	7c0c8dd	Commit Preview URL Branch Preview URL	May 15 2026, 02:02 PM