Add mine-when-idle, default banlist, and console parsing improvements

Mine-when-idle:
- Auto-start/stop mining based on system idle time detection
- Platform::getSystemIdleSeconds() via XScreenSaver (Linux) / GetLastInputInfo (Win)
- Settings: mine_when_idle toggle + configurable delay (30s–10m)
- Settings page UI with checkbox and delay combo

Console tab:
- Shell-like argument parsing with quote and JSON bracket support
- Pass JSON objects/arrays directly as RPC params
- Fix selection indices when lines are evicted from buffer

Connection & status bar:
- Reduce RPC connect timeout to 1s for localhost fast-fail
- Fast retry timer on daemon startup and external daemon detection
- Show pool mining hashrate in status bar; sidebar badge reflects pool state

UI polish:
- Add logo to About card in settings; expose logo dimensions on App
- Header title offset-y support; adjust content-area margins
- Fix banned peers row cursor position (rawRowPosB.x)

Branding:
- Update copyright to "DragonX Developers" in RC and About section
- Replace logo/icon assets with updated versions

Misc:
- setup.sh: checkout dragonx branch before pulling
- Remove stale prebuilt-binaries/xmrig/.gitkeep

setup.sh

@@ -416,8 +416,8 @@ clone_dragonx_if_needed() {
         git clone https://git.dragonx.is/DragonX/dragonx.git "$DRAGONX_SRC"
     else
         ok "dragonx source already present"
-        info "Pulling latest dragonx..."
-        (cd "$DRAGONX_SRC" && git pull --ff-only 2>/dev/null || true)
+        info "Switching to dragonx branch and pulling latest..."
+        (cd "$DRAGONX_SRC" && git checkout dragonx 2>/dev/null && git pull --ff-only 2>/dev/null || true)
     fi
 }