feat: enum/bitfield editing, MCP guard rails, PDB anonymous type inlining

- Enum inline editing: name/value commit handling, auto-sort by value
- Bitfield support in PDB import with proper container nodes
- Per-member hover/selection highlighting (kMemberBit encoding)
- Context menu fixes for enum/bitfield member lines
- MCP pagination (limit/offset), includeMembers param, tree.search tool
- MCP status bar activity indicator for tool calls
- PDB anonymous type inlining: inline <unnamed-tag> types as children
- Skip anonymous pointer targets to prevent root orphans
- Enum import diagnostics for debugging missing enums

tests/test_format.cpp

@@ -29,12 +29,12 @@ private slots:
     }
 
     void testFmtPointer64_null() {
-        QCOMPARE(fmt::fmtPointer64(0), QString("-> NULL"));
+        QCOMPARE(fmt::fmtPointer64(0), QString("0x0"));
     }
 
     void testFmtPointer64_nonNull() {
         QString s = fmt::fmtPointer64(0x400000);
-        QVERIFY(s.startsWith("-> 0x"));
+        QVERIFY(s.startsWith("0x"));
         QVERIFY(s.contains("400000"));
     }