Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

packages/plugins/embeds/src/schemas.ts

@@ -0,0 +1,162 @@
+/**
+ * Block schemas for embed types
+ *
+ * These define the Portable Text block structure for each embed type.
+ * The schemas match the props expected by astro-embed components.
+ */
+
+import { z } from "astro/zod";
+
+/** Matches http(s) scheme at start of URL */
+const HTTP_SCHEME_RE = /^https?:\/\//i;
+
+/** Validates that a URL string uses http or https scheme. Rejects javascript:/data: URI XSS vectors. */
+const httpUrl = z
+	.string()
+	.url()
+	.refine((url) => HTTP_SCHEME_RE.test(url), "URL must use http or https");
+
+/**
+ * YouTube embed block
+ * @see https://astro-embed.netlify.app/components/youtube/
+ */
+export const youtubeBlockSchema = z.object({
+	_type: z.literal("youtube"),
+	_key: z.string(),
+	/** YouTube video ID or URL */
+	id: z.string(),
+	/** Custom poster image URL */
+	poster: httpUrl.optional(),
+	/** Poster quality when using default YouTube thumbnail */
+	posterQuality: z.enum(["max", "high", "default", "low"]).optional(),
+	/** YouTube player parameters (e.g., "start=57&end=75") */
+	params: z.string().optional(),
+	/** Accessible label for the play button */
+	playlabel: z.string().optional(),
+	/** Visible title overlay */
+	title: z.string().optional(),
+});
+
+export type YouTubeBlock = z.infer<typeof youtubeBlockSchema>;
+
+/**
+ * Vimeo embed block
+ * @see https://astro-embed.netlify.app/components/vimeo/
+ */
+export const vimeoBlockSchema = z.object({
+	_type: z.literal("vimeo"),
+	_key: z.string(),
+	/** Vimeo video ID or URL */
+	id: z.string(),
+	/** Custom poster image URL */
+	poster: httpUrl.optional(),
+	/** Poster quality */
+	posterQuality: z.enum(["max", "high", "default", "low"]).optional(),
+	/** Vimeo player parameters */
+	params: z.string().optional(),
+	/** Accessible label for the play button */
+	playlabel: z.string().optional(),
+});
+
+export type VimeoBlock = z.infer<typeof vimeoBlockSchema>;
+
+/**
+ * Twitter/X tweet embed block
+ * @see https://astro-embed.netlify.app/components/twitter/
+ */
+export const tweetBlockSchema = z.object({
+	_type: z.literal("tweet"),
+	_key: z.string(),
+	/** Tweet URL or ID */
+	id: z.string(),
+	/** Color theme */
+	theme: z.enum(["light", "dark"]).optional(),
+});
+
+export type TweetBlock = z.infer<typeof tweetBlockSchema>;
+
+/**
+ * Bluesky post embed block
+ * @see https://astro-embed.netlify.app/components/bluesky/
+ */
+export const blueskyBlockSchema = z.object({
+	_type: z.literal("bluesky"),
+	_key: z.string(),
+	/** Bluesky post URL or AT URI */
+	id: z.string(),
+});
+
+export type BlueskyBlock = z.infer<typeof blueskyBlockSchema>;
+
+/**
+ * Mastodon post embed block
+ * @see https://astro-embed.netlify.app/components/mastodon/
+ */
+export const mastodonBlockSchema = z.object({
+	_type: z.literal("mastodon"),
+	_key: z.string(),
+	/** Mastodon post URL */
+	id: z.string(),
+});
+
+export type MastodonBlock = z.infer<typeof mastodonBlockSchema>;
+
+/**
+ * Link preview / Open Graph embed block
+ * @see https://astro-embed.netlify.app/components/link-preview/
+ */
+export const linkPreviewBlockSchema = z.object({
+	_type: z.literal("linkPreview"),
+	_key: z.string(),
+	/** URL to fetch Open Graph data from */
+	id: httpUrl,
+	/** Hide media (image/video) even if present in OG data */
+	hideMedia: z.boolean().optional(),
+});
+
+export type LinkPreviewBlock = z.infer<typeof linkPreviewBlockSchema>;
+
+/**
+ * GitHub Gist embed block
+ * @see https://astro-embed.netlify.app/components/gist/
+ */
+export const gistBlockSchema = z.object({
+	_type: z.literal("gist"),
+	_key: z.string(),
+	/** Gist URL */
+	id: httpUrl,
+	/** Specific file to show (case-sensitive) */
+	file: z.string().optional(),
+});
+
+export type GistBlock = z.infer<typeof gistBlockSchema>;
+
+/**
+ * Union of all embed block types
+ */
+export const embedBlockSchema = z.discriminatedUnion("_type", [
+	youtubeBlockSchema,
+	vimeoBlockSchema,
+	tweetBlockSchema,
+	blueskyBlockSchema,
+	mastodonBlockSchema,
+	linkPreviewBlockSchema,
+	gistBlockSchema,
+]);
+
+export type EmbedBlock = z.infer<typeof embedBlockSchema>;
+
+/**
+ * Block type names for use in plugin registration
+ */
+export const EMBED_BLOCK_TYPES = [
+	"youtube",
+	"vimeo",
+	"tweet",
+	"bluesky",
+	"mastodon",
+	"linkPreview",
+	"gist",
+] as const;
+
+export type EmbedBlockType = (typeof EMBED_BLOCK_TYPES)[number];