feat: type hints green [bracketed] notation, workspace cleanup, unique naming

- Type inference hints now show value-first with bracketed type in comment
  green: "0x7ff718570000 [ptr64]", "6, 16 [int32_t×2]"
- Raise hint threshold to strong-only (score >= 75%)
- Remove Bool inference, widen Int16 range to ±16384
- Workspace: remove dead WorkspaceProxy, fix null deref, debounce search,
  cache icons, add pinning support
- Unique naming: UnnamedClass0/UnnamedEnum1 with global counter
- Footer buttons: +10h +100h +1000h replacing +1024
- MCP: project lifecycle API, snapshot provider fix

src/format.cpp

@@ -661,8 +661,10 @@ QString validateValue(NodeKind kind, const QString& text) {
         QString digits = hasHexPrefix ? s.mid(2) : s;
 
         if (hasHexPrefix || isHexKind) {
-            // Hex mode: only 0-9, a-f, A-F
+            // Hex mode: only 0-9, a-f, A-F (spaces allowed for multi-byte hex kinds)
+            bool isMultiByteHex = (kind >= NodeKind::Hex16 && kind <= NodeKind::Hex64);
             for (QChar c : digits) {
+                if (c == ' ' && isMultiByteHex) continue;
                 if (!c.isDigit() && !(c >= 'a' && c <= 'f') && !(c >= 'A' && c <= 'F'))
                     return QStringLiteral("invalid hex '%1'").arg(c);
             }