feat: add recent query logging and display in UI

CHANGELOG.md

@@ -3,6 +3,24 @@
 Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 versioning follows [Semantic Versioning](https://semver.org/).
 
+## [0.4.0] — 2026-08-09
+
+"You can now see what the resolver is actually being asked."
+
+### Added
+
+- A live view of the last 200 queries the resolver handled, each marked as
+  blocked, served from cache, or sent upstream, with a filter by name.
+
+### Notes
+
+- The view is held in memory only. It is never written to the log file and is
+  discarded when blocking is switched off, because it records every name looked
+  up on the machine and not only the blocked ones — it exists to answer "what
+  just happened", not to accumulate a browsing history.
+- It costs a fixed 56 KB of memory and roughly 8 ns per query, so it is on by
+  default with nothing to configure.
+
 ## [0.3.0] — 2026-08-09
 
 "It now closes websites, not just programs."
@@ -91,6 +109,7 @@ browser."
 - Runs as a Windows SYSTEM service and requires 64-bit Windows.
 - Configuration is stored in `C:\ProgramData\SysHelper`.
 
+[0.4.0]: https://git.robonen.ru/robonen/syshelper/compare/v0.3.0...v0.4.0
 [0.3.0]: https://git.robonen.ru/robonen/syshelper/compare/v0.2.0...v0.3.0
 [0.2.0]: https://git.robonen.ru/robonen/syshelper/compare/v0.1.1...v0.2.0
 [0.1.1]: https://git.robonen.ru/robonen/syshelper/compare/v0.1.0...v0.1.1