Restore vertical scroll + line-based markdown; swipe on bottom bar; bump to 3.3

The horizontal paging ScrollView squished the markdown text and the TabView
broke navigation. Revert to the plain vertical ScrollView + switch (always
rendered correctly). Swipe-to-change now lives on the bottom tab bar itself
(simultaneous DragGesture), so tapping tabs still works. Rewrite MarkdownText
line-based: each source line renders on its own line (AttributedString
collapses single newlines into spaces), with heading/bullet/code handling.
Bump to 3.3.

GiteaPR/Detail/Tabs.swift

@@ -167,6 +167,11 @@ struct OverviewTab: View {
 
 /// A Text view that renders a markdown string, falling back to plain text if
 /// the markdown can't be parsed.
+///
+/// Line-based: each source line renders on its own line (AttributedString
+/// collapses single newlines into spaces, which squishes PR bodies that use
+/// one-line-per-key formatting). Handles headings, bullets, and code fences;
+/// inline formatting (bold, italic, links, inline code) via AttributedString.
 struct MarkdownText: View {
     let markdown: String
 
@@ -175,12 +180,55 @@ struct MarkdownText: View {
     }
 
     var body: some View {
-        if let attributed = try? AttributedString(markdown: markdown) {
+        VStack(alignment: .leading, spacing: 6) {
+            let lines = markdown.components(separatedBy: "\n")
+            var inCodeBlock = false
+            ForEach(Array(lines.enumerated()), id: \.offset) { _, line in
+                if line.hasPrefix("```") {
+                    inCodeBlock.toggle()
+                } else if inCodeBlock {
+                    Text(line)
+                        .font(.caption.monospaced())
+                        .frame(maxWidth: .infinity, alignment: .leading)
+                        .padding(4)
+                        .background(Color(.secondarySystemBackground))
+                } else if line.hasPrefix("# ") || line.hasPrefix("## ") || line.hasPrefix("### ") {
+                    heading(line)
+                } else if line.hasPrefix("- ") || line.hasPrefix("* ") {
+                    bullet(line)
+                } else if line.trimmingCharacters(in: .whitespaces).isEmpty {
+                    Spacer(minLength: 4)
+                } else {
+                    inline(line)
+                }
+            }
+        }
+        .frame(maxWidth: .infinity, alignment: .leading)
+    }
+
+    private func heading(_ line: String) -> some View {
+        let level = line.prefix(while: { $0 == "#" }).count
+        let text = line.dropFirst(level).trimmingCharacters(in: .whitespaces)
+        return Text(text)
+            .font(level == 1 ? .title2.bold() : level == 2 ? .title3.bold() : .headline)
+            .frame(maxWidth: .infinity, alignment: .leading)
+    }
+
+    private func bullet(_ line: String) -> some View {
+        HStack(alignment: .top, spacing: 6) {
+            Text("•")
+            inline(String(line.dropFirst(2)))
+        }
+        .frame(maxWidth: .infinity, alignment: .leading)
+    }
+
+    private func inline(_ text: String) -> some View {
+        if let attributed = try? AttributedString(markdown: text) {
             Text(attributed)
                 .font(.callout)
                 .frame(maxWidth: .infinity, alignment: .leading)
         } else {
-            Text(markdown)
+            Text(text)
                 .font(.callout)
                 .frame(maxWidth: .infinity, alignment: .leading)
         }