feat(chat): welcome screen primitive (0.0.15)

[blove]

What

Phase 3 of the chat pipeline redesign (spec: docs/superpowers/specs/2026-05-02-chat-pipeline-redesign-design.md).

Adds a dedicated <chat-welcome> primitive that owns the empty-state UX. Replaces the inline placeholder previously embedded in the chat scroll container.

Behavior

• Renders centered greeting + projected input + optional suggestion rows
• Visible when agent.messages() is empty AND welcomeDisabled=false AND thread isn't loading
• Hides smoothly once a turn happens; conversation layout takes over

Differentiators

• Two-line greeting (h1 + subtitle paragraph)
• Beacon dot above the title with a 2s pulse animation
• <chat-welcome-suggestion> helper for vertical action rows
• 200ms fade-in on mount

API additions

• New input on <chat>: welcomeDisabled (boolean, default false)
• New computed: showWelcome (driven by welcomeDisabled + agent.isThreadLoading() + agent.messages().length)
• New components: ChatWelcomeComponent, ChatWelcomeSuggestionComponent (both exported from public-api)

Versions

• @ngaf/chat: 0.0.14 → 0.0.15

Testing

• nx test chat: PASS (full suite)
• nx build chat: clean
• 5 new specs:
  • chat-welcome.component (3 tests: default greeting, beacon, slot anchors)
  • chat-welcome-suggestion.component (2 tests: label render, click emit)
  • chat.component (3 new welcome-branch tests: empty / non-empty / disabled)

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 2, 2026 7:03pm