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

src/app.h

@@ -174,6 +174,9 @@ public:
     void startPoolMining(int threads);
     void stopPoolMining();
 
+    // Mine-when-idle state query
+    bool isIdleMiningActive() const { return idle_mining_active_; }
+
     // Peers
     const std::vector<PeerInfo>& getPeers() const { return state_.peers; }
     const std::vector<BannedPeer>& getBannedPeers() const { return state_.bannedPeers; }
@@ -264,6 +267,8 @@ public:
 
     // Logo texture accessor (wallet branding icon)
     ImTextureID getLogoTexture() const { return logo_tex_; }
+    int getLogoWidth() const { return logo_w_; }
+    int getLogoHeight() const { return logo_h_; }
 
     // Coin logo texture accessor (DragonX currency icon for balance tab)
     ImTextureID getCoinLogoTexture() const { return coin_logo_tex_; }
@@ -564,6 +569,9 @@ private:
     // Auto-lock on idle
     std::chrono::steady_clock::time_point last_interaction_ = std::chrono::steady_clock::now();
 
+    // Mine-when-idle: auto-start/stop mining based on system idle state
+    bool idle_mining_active_ = false;  // true when mining was auto-started by idle detection
+
     // Private methods - rendering
     void renderStatusBar();
     void renderAboutDialog();
@@ -582,6 +590,7 @@ private:
     void tryConnect();
     void onConnected();
     void onDisconnected(const std::string& reason);
+    void applyDefaultBanlist();
 
     // Private methods - data refresh
     void refreshData();
@@ -590,6 +599,7 @@ private:
     void refreshPrice();
     void refreshWalletEncryptionState();
     void checkAutoLock();
+    void checkIdleMining();
 };
 
 } // namespace dragonx