v1.3.0

🎉 GoSlide v1.3.0

What's New

🖼️ Image Placeholder Component

A new placeholder component — a styled dashed-rectangle "image
stand-in" with an icon, title, and optional description. Drop one
wherever a real image will eventually go, then replace it with the
actual asset when ready.

~~~placeholder
hint: K8s cluster architecture
icon: 🗺️
aspect: 16:9
---
Control plane + worker node interaction
~~~

• hint (required) — title text describing what the image will show
• icon (optional) — single emoji cue (📊 charts, 🗺️ diagrams, 📷 photos, 📈 trends, 🖼️ generic)
• aspect (optional) — 16:9 (default), 4:3, 1:1, 3:4, or 9:16
• Body (between --- and closing fence) — optional subtitle

Placeholders work in any layout: as a full-slide cover diagram, inside
an image-left/image-right region, or combined with the new
image-grid below.

🧩 image-grid Layout

A new CSS-grid slide layout that packs multiple cells (placeholders,
real images, charts, or any other component) into 2, 3, or 4 columns.

<!-- layout: image-grid -->
<!-- columns: 2 -->

<!-- cell -->
~~~placeholder
hint: Architecture
icon: 🗺️
~~~

<!-- cell -->
![Dashboard](./dashboard.png)

<!-- cell -->
~~~chart
type: bar
title: Sales
data:
  labels: [Q1, Q2, Q3]
  values: [10, 12, 15]
~~~

<!-- cell -->
~~~placeholder
hint: Trends
icon: 📈
~~~

<!-- cell --> before each item marks a new grid cell; cells can hold
any content.

🤖 Smarter goslide generate

The AI-generation command (Phase 6a) now knows about the new features.
The system prompt has been tightened so LLM output consistently uses the
correct fence and comment syntax:

• All component fences are ~~~ (triple tilde). Triple-backtick blocks
  are plain code and will not render as components.
• Per-slide layout settings use HTML comments
  (<!-- layout: image-grid -->, <!-- columns: 2 -->), never a
  YAML --- block mid-document.
• Explicit "wrong vs right" examples and a new image-grid example in
  the prompt.

On OpenRouter free tier, 5 of 6 models tested after this iteration
produce valid, first-pass-parseable output. See
examples/ai-generated/k8s-visual.md
for a real generation (openai/gpt-oss-20b:free, 13 placeholders + one
4-cell image-grid slide).

✅ Validation

goslide validate / goslide build emit:

• Error placeholder-missing-hint when a placeholder lacks hint
• Warning unknown-aspect when aspect isn't on the whitelist (falls back to 16:9)
• Warning columns-out-of-range when image-grid columns fall outside 2-4
• Warning image-grid-empty when an image-grid layout contains no cells

Compatibility

No breaking changes. v1.2.0 decks work unchanged. The internal region
parser was refactored from a name-keyed map to an ordered slice so that
repeatable markers (<!-- cell -->) produce distinct regions —
transparent to existing layouts (two-column, three-column, etc.) since
none of them used repeated markers.

Full Changelog

See v1.2.0...v1.3.0 for all changes.