feat: add Report/About/Changelog buttons to Support ribbon group

- REPORT opens GitHub new-issue page
- ABOUT opens a dialog window with version, OS and arch info + Copy Info button
- CHANGELOG opens GitHub releases page
- Fix Windows build: add windows-sys as target-specific dependency for PRINT command

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/icons/report.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+  <!-- Bug body (oval) -->
+  <ellipse cx="12" cy="13" rx="5" ry="6"/>
+  <!-- Head -->
+  <circle cx="12" cy="6" r="2.2"/>
+  <!-- Antennae -->
+  <line x1="10.5" y1="4.2" x2="8" y2="2"/>
+  <line x1="13.5" y1="4.2" x2="16" y2="2"/>
+  <!-- Left legs -->
+  <line x1="7" y1="10" x2="4" y2="9"/>
+  <line x1="7" y1="13" x2="4" y2="13"/>
+  <line x1="7" y1="16" x2="4" y2="17"/>
+  <!-- Right legs -->
+  <line x1="17" y1="10" x2="20" y2="9"/>
+  <line x1="17" y1="13" x2="20" y2="13"/>
+  <line x1="17" y1="16" x2="20" y2="17"/>
+</svg>