Frontend uudelleenrakennettu: Astro-komponentit, Wasm pääsäikeessä, ei Workeria

Vanha frontend siirretty temp/. Uusi rakenne:
- StatusBar.astro, Terminal.astro, Editor.astro, Guide.astro
- global.css erillinen
- Wasm pääsäikeessä (ei Worker — yksinkertainen, debugattava)
- Tab-completion, dropdown, projektikortti, Monaco, GUIDE.md
- Ei tokenisointia eikä koodilaboratoriota

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

network-poc/frontend/node_modules/prismjs/plugins/toolbar/prism-toolbar.css

@@ -0,0 +1,65 @@
+div.code-toolbar {
+	position: relative;
+}
+
+div.code-toolbar > .toolbar {
+	position: absolute;
+	z-index: 10;
+	top: .3em;
+	right: .2em;
+	transition: opacity 0.3s ease-in-out;
+	opacity: 0;
+}
+
+div.code-toolbar:hover > .toolbar {
+	opacity: 1;
+}
+
+/* Separate line b/c rules are thrown out if selector is invalid.
+   IE11 and old Edge versions don't support :focus-within. */
+div.code-toolbar:focus-within > .toolbar {
+	opacity: 1;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item {
+	display: inline-block;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > a {
+	cursor: pointer;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > button {
+	background: none;
+	border: 0;
+	color: inherit;
+	font: inherit;
+	line-height: normal;
+	overflow: visible;
+	padding: 0;
+	-webkit-user-select: none; /* for button */
+	-moz-user-select: none;
+	-ms-user-select: none;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > a,
+div.code-toolbar > .toolbar > .toolbar-item > button,
+div.code-toolbar > .toolbar > .toolbar-item > span {
+	color: #bbb;
+	font-size: .8em;
+	padding: 0 .5em;
+	background: #f5f2f0;
+	background: rgba(224, 224, 224, 0.2);
+	box-shadow: 0 2px 0 0 rgba(0,0,0,0.2);
+	border-radius: .5em;
+}
+
+div.code-toolbar > .toolbar > .toolbar-item > a:hover,
+div.code-toolbar > .toolbar > .toolbar-item > a:focus,
+div.code-toolbar > .toolbar > .toolbar-item > button:hover,
+div.code-toolbar > .toolbar > .toolbar-item > button:focus,
+div.code-toolbar > .toolbar > .toolbar-item > span:hover,
+div.code-toolbar > .toolbar > .toolbar-item > span:focus {
+	color: inherit;
+	text-decoration: none;
+}