chore: restructure llm plugin to be more coherent & fix various bugs in llm ui

Plugins/ZShell/Llm/clipboard.cpp

@@ -0,0 +1,61 @@
+#include "clipboard.hpp"
+
+#include <QDebug>
+#include <QClipboard>
+#include <QDateTime>
+#include <QDir>
+#include <QGuiApplication>
+#include <QImage>
+#include <QMimeData>
+#include <QUrl>
+
+namespace ZShell::llm::clipboard {
+
+bool hasAttachment() {
+	QClipboard* clipboard = QGuiApplication::clipboard();
+	if (!clipboard) return false;
+	const QMimeData* data = clipboard->mimeData();
+	if (!data) return false;
+	if (data->hasImage()) return true;
+	for (const QUrl& url : data->urls())
+		if (url.isLocalFile()) return true;
+	return false;
+}
+
+QStringList attachmentPaths(QString& error) {
+	error.clear();
+	QClipboard* clipboard = QGuiApplication::clipboard();
+	const QMimeData* data = clipboard ? clipboard->mimeData() : nullptr;
+	if (!data) {
+		qWarning() << "clipboard: no clipboard data";
+		return {};
+	}
+
+	QStringList paths;
+	if (data->hasImage()) {
+		const QImage image = clipboard->image();
+		if (image.isNull()) {
+			error = QStringLiteral("Clipboard image could not be decoded");
+			return {};
+		}
+		const QString tempPath =
+			QDir::tempPath() + QStringLiteral("/zshell-pasted-image-%1.png")
+								   .arg(QDateTime::currentMSecsSinceEpoch());
+		if (!image.save(tempPath)) {
+			error = QStringLiteral("Could not save the pasted image");
+			return {};
+		}
+		paths.append(tempPath);
+	} else if (data->hasUrls()) {
+		for (const QUrl& url : data->urls())
+			if (url.isLocalFile()) paths.append(url.toLocalFile());
+	}
+
+	if (paths.isEmpty() && (data->hasImage() || data->hasUrls()))
+		error = QStringLiteral(
+			"Nothing usable on the clipboard (expected an image "
+			"or copied files)");
+	return paths;
+}
+
+} // namespace ZShell::llm::clipboard