Milestone 8 UX: folder tree workflows, about dialog, and app icon polish

src/about_dialog.cpp

@@ -0,0 +1,92 @@
+#include "about_dialog.h"
+
+#include <QApplication>
+#include <QCoreApplication>
+#include <QDialogButtonBox>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QTextBrowser>
+#include <QVBoxLayout>
+
+AboutDialog::AboutDialog(QWidget* parent) : QDialog(parent)
+{
+    setWindowTitle(QStringLiteral("About OrbitHub"));
+    setWindowIcon(QApplication::windowIcon());
+    resize(760, 560);
+
+    auto* layout = new QVBoxLayout(this);
+    layout->setContentsMargins(16, 16, 16, 16);
+    layout->setSpacing(12);
+
+    auto* headerRow = new QHBoxLayout();
+    headerRow->setSpacing(12);
+
+    auto* iconLabel = new QLabel(this);
+    iconLabel->setFixedSize(80, 80);
+    iconLabel->setPixmap(QApplication::windowIcon().pixmap(80, 80));
+    iconLabel->setAlignment(Qt::AlignCenter);
+
+    auto* titleColumn = new QVBoxLayout();
+    titleColumn->setSpacing(4);
+
+    auto* title = new QLabel(QStringLiteral("<h1 style='margin:0'>OrbitHub</h1>"), this);
+    auto* subtitle = new QLabel(
+        QStringLiteral("Unified remote session manager for SSH, RDP, and VNC workflows."),
+        this);
+    subtitle->setWordWrap(true);
+    subtitle->setStyleSheet(QStringLiteral("color: palette(mid);"));
+
+    const QString version = QCoreApplication::applicationVersion().trimmed().isEmpty()
+        ? QStringLiteral("Development build")
+        : QCoreApplication::applicationVersion().trimmed();
+    auto* buildLine = new QLabel(
+        QStringLiteral("Version: %1 | Qt runtime linked dynamically").arg(version),
+        this);
+    buildLine->setStyleSheet(QStringLiteral("color: palette(mid);"));
+
+    titleColumn->addWidget(title);
+    titleColumn->addWidget(subtitle);
+    titleColumn->addWidget(buildLine);
+    titleColumn->addStretch();
+
+    headerRow->addWidget(iconLabel, 0, Qt::AlignTop);
+    headerRow->addLayout(titleColumn, 1);
+
+    auto* browser = new QTextBrowser(this);
+    browser->setOpenExternalLinks(true);
+    browser->setStyleSheet(QStringLiteral(
+        "QTextBrowser { border: 1px solid palette(midlight); border-radius: 8px; padding: 8px; }"));
+    browser->setHtml(QStringLiteral(R"(
+<h3 style="margin-top:0">Third-Party Libraries</h3>
+<p>OrbitHub uses the following external libraries:</p>
+<table cellspacing="0" cellpadding="6" border="1" style="border-collapse:collapse; width:100%;">
+  <tr><th align="left">Library</th><th align="left">License</th><th align="left">Upstream</th></tr>
+  <tr><td>Qt 6 (Widgets / SQL)</td><td>LGPLv3 / GPLv3 / Commercial</td><td><a href="https://www.qt.io/licensing">qt.io/licensing</a></td></tr>
+  <tr><td>KodoTerm</td><td>MIT</td><td><a href="https://github.com/diegoiast/KodoTerm">github.com/diegoiast/KodoTerm</a></td></tr>
+  <tr><td>libvterm</td><td>MIT</td><td><a href="https://github.com/neovim/libvterm">github.com/neovim/libvterm</a></td></tr>
+  <tr><td>FreeRDP / WinPR</td><td>Apache License 2.0</td><td><a href="https://github.com/FreeRDP/FreeRDP">github.com/FreeRDP/FreeRDP</a></td></tr>
+</table>
+
+<h3>License Links</h3>
+<ul>
+  <li><a href="https://www.gnu.org/licenses/lgpl-3.0.html">GNU LGPLv3 (gnu.org)</a></li>
+  <li><a href="https://opensource.org/licenses/MIT">MIT License (opensource.org)</a></li>
+  <li><a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License 2.0 (apache.org)</a></li>
+</ul>
+
+<h3>License Files In This Repository</h3>
+<ul>
+  <li><code>third_party/KodoTerm/LICENSE</code></li>
+  <li><code>third_party/FreeRDP/LICENSE</code></li>
+  <li><code>LICENSE</code> (project license)</li>
+</ul>
+)"));
+
+    auto* buttons = new QDialogButtonBox(QDialogButtonBox::Close, this);
+    connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::reject);
+    connect(buttons, &QDialogButtonBox::accepted, this, &QDialog::accept);
+
+    layout->addLayout(headerRow);
+    layout->addWidget(browser, 1);
+    layout->addWidget(buttons);
+}