ui: core primitives + state panels

[EhabY]

Tracked in DEVEX-618 · Project: Workspaces webview + UI library

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Many small, independent components. Line count adds up but each is simple and story-heavy (mostly boilerplate).

Scope

Primitives:

• IconButton, Icon (codicon wrapper, adds @vscode/codicons asset dep), Spinner, ProgressBar, SearchInput, StatusPill

State panels:

• WelcomePanel, EmptyState, ErrorState, Skeleton (optional first-load placeholder)

Open question (resolve during implementation)

WelcomePanel vs reusing the native VS Code viewsWelcome contribution for the unauthenticated state — if native is kept, drop WelcomePanel from scope.

Acceptance

• Stories for every component and notable states (hover/active/disabled/indeterminate)
• No new runtime deps beyond @vscode/codicons

[linear-code]

ENG-3047

[EhabY]

This GitHub issue tracks DEVEX-618. The auto-created ENG-3047 has been canceled as a duplicate.

Project: Workspaces webview + UI library

[EhabY]

Consolidation update:

• The Linear-GitHub sync auto-created ENG-3047 from this issue and bi-directionally links them (closing one closes the other).
• ENG-3047 is marked as a sync stub — do not track work there.
• The canonical tracker is DEVEX-618, which ENG-3047 is related to.
• Project: Workspaces webview + UI library