feat: scanner panel with signature/value search, rescan, address delegate

- Signature mode (IDA-style patterns with wildcards) and value mode (typed exact match)
- Async scan engine with progress, cancel support
- Re-scan updates all results with unified progress (single-pass read + table build)
- Previous value column appears after first re-scan
- WinDbg backtick address format with dimmed leading zeros (AddressDelegate)
- Inline editing: address expressions navigate, value edits write to provider
- Right-click context menu: Copy Address, Copy Value, Go to Address
- Auto-sized columns, themed buttons with icons, dynamic combo width
- 49 UI tests covering scan, rescan, editing, theming, progress completion

src/resources.qrc

@@ -57,5 +57,8 @@
         <file alias="remote.svg">vsicons/remote.svg</file>
         <file alias="plug.svg">vsicons/plug.svg</file>
         <file alias="clear-all.svg">vsicons/clear-all.svg</file>
+        <file alias="search.svg">vsicons/search.svg</file>
+        <file alias="regex.svg">vsicons/regex.svg</file>
+        <file alias="refresh.svg">vsicons/refresh.svg</file>
     </qresource>
 </RCC>