refactor(audit): batch 3 — decompose App::update() + collapse acrylic fork

Three P1 structural refactors from the audit; no behavior change.

1. Extract the ~180-line daemon-stdout rescan/witness parser out of the
   ~790-line App::update() into a pure, static, unit-testable
   NetworkRefreshService::parseDaemonRescanOutput() returning a
   DaemonRescanScan result struct (sits next to the existing static parse*
   siblings). The scanning half moved verbatim; App::update() keeps the
   state-application half, now reading scan.* fields. Adds
   testParseDaemonRescanOutput() covering all six daemon signals + edge
   cases against fixture log snippets — previously untestable without a
   live daemon.

2. Extract the ~95-line global keyboard-shortcut block (Ctrl+, / theme
   cycle / F5 / low-spec / effects / gradient / wizard) out of
   App::update() into App::handleGlobalShortcuts().

3. Collapse the ImGuiAcrylic frontend fork: the GLAD and DX11 namespaces
   were ~375 lines of semantically-identical code (the frontend makes zero
   direct GL/DX calls — all backend work delegates to AcrylicMaterial, which
   has a backend per API). Extended the single frontend's guard to
   #if defined(DRAGONX_HAS_GLAD) || defined(DRAGONX_USE_DX11) and deleted the
   DX11 duplicate, leaving the no-backend stub. Kills the Windows/DX11 drift
   hazard (acrylic frontend changes now made once).

Verified: full-node + Lite build clean; ctest 1/1 (incl. the new parser
tests); source-hygiene clean; and the collapsed acrylic path was
compile-verified under DX11 via the mingw-w64 Windows cross-build
(ObsidianDragon.exe links).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app.h

@@ -443,6 +443,9 @@ private:
     friend class AppDaemonLifecycleRuntime;
     friend class AppDaemonLifecycleTaskContext;
 
+    // Global keyboard-shortcut handling, dispatched once per frame from update().
+    void handleGlobalShortcuts();
+
     bool sendStopCommandSafely(rpc::RPCClient& client, const char* context);
     void maybeFinishTransactionSendProgress();
     void upsertPendingSendTransaction(const std::string& opid,