improvement(ui): consolidate fade-only overflow

[waleedlatif1]

Summary

• standardize shared read-only labels on fade-only overflow with full-value tooltips
• consolidate chips, selectors, menus, breadcrumbs, previews, and workflow rendering behind shared overflow primitives
• document the canonical rule and explicit technical, editable, grid, and rich-content exceptions

Type of Change

• Bug fix

Testing

• bun run lint
• bun run check:audits
• bun run type-check
• bun run test
• bun run apps/sim/scripts/check-block-registry.ts origin/staging

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated (UTC)
docs	Building	Preview	Aug 28, 2026 8:18pm

[waleedlatif1]

@cubic review

[cubic-dev-ai]

@cubic review

@waleedlatif1 I have started the AI code review. It will take a few minutes to complete.

[greptile-apps]

Greptile Summary

The PR standardizes single-line, read-only labels on shared fade-only overflow behavior and full-value tooltips.

• Adds reusable clipping and menu-label primitives to @sim/emcn.
• Moves combobox, chip, menu, breadcrumb, preview, and workspace labels onto the shared behavior.
• Updates workflow-renderer labels while preserving ellipsis for code-preview content.
• Documents editable, technical, grid, and rich-content exceptions and expands regression tests.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failures identified.

The shared primitives preserve clipping, conditional full-value tooltips, rich-content fallbacks, and existing code-preview truncation, while the updated callers consistently supply the required plain labels.

Important Files Changed

Filename	Overview
packages/emcn/src/components/overflow-text/overflow-text.tsx	Centralizes hard clipping and conditional edge fading while extending keyboard tooltip targeting to menu items.
packages/emcn/src/components/dropdown-menu/dropdown-menu.tsx	Introduces a canonical menu-item label and preserves Radix asChild composition while normalizing plain-text children.
packages/emcn/src/components/combobox/combobox.tsx	Moves non-editable visual overlays onto the shared overflow primitive while retaining the interactive layer’s tooltip.
packages/emcn/src/components/chip-dropdown/chip-dropdown.tsx	Applies shared fade-only rendering to plain trigger and option labels with a hard-clipped fallback for rich content.
packages/emcn/src/components/chip-select/chip-select.tsx	Consolidates trigger and menu option overflow handling without changing selection behavior.
packages/workflow-renderer/src/lib/overflow-span.tsx	Routes ordinary renderer labels through shared fade-only overflow while preserving truncation for code previews.
packages/workflow-renderer/src/workflow-block/sub-block-row-view.tsx	Removes duplicated truncation classes now owned by the renderer’s shared overflow wrapper.

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