C14.14: export HTML, HTML and folder, PDF (MuPDF story in the PDF worker) and plain text; print; rich copy

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/ely-mark/Cargo.toml

@@ -12,14 +12,17 @@ embed-resource.workspace = true
 
 [dependencies]
 anyhow.workspace = true
+base64.workspace = true
 ely-files.workspace = true
 ely-gpui-component.workspace = true
 ely-office.workspace = true
+ely-pdf-engine.workspace = true
 ely-platform.workspace = true
 ely-ui.workspace = true
 gpui.workspace = true
 log.workspace = true
 futures.workspace = true
+markdown = "=1.0.0"
 jiff.workspace = true
 notify.workspace = true
 serde.workspace = true
@@ -29,7 +32,6 @@ serde_json.workspace = true
 workspace = true
 
 [dev-dependencies]
-markdown = "=1.0.0"
 ely-gpui-component = { workspace = true, features = ["test-support"] }
 ely-ui = { workspace = true, features = ["test-support"] }
 gpui = { workspace = true, features = ["test-support"] }