fix: Tier-2 mediums — input trims, confirmations, amount normalization

More robustness fixes from the audit (the import-key pattern, lower severity):

- Trim pasted input before use/validation: network add-server URL/label,
  lite-wallet key import (+ block empty), validate-address, address-book entry.
- Confirmations for destructive/irreversible actions:
  - Address-book Delete now needs a confirming second click (no undo).
  - Console `stop` needs a confirming second `stop` (it shuts down the node).
  - Wizard "Skip" encryption needs a confirming second click (keys stored
    unencrypted).
- Send amount: normalize to 8dp (satoshi precision) on both the DRGX and USD
  inputs so digits past 8dp aren't silently dropped between the preview/review
  and what's actually sent.

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

src/app_wizard.cpp

@@ -1356,16 +1356,24 @@ void App::renderFirstRunWizard() {
                 ImGui::SetCursorScreenPos(ImVec2(bx + encBtnW + 12.0f * dp, cy));
                 ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 8.0f * dp);
                 if (ui::material::TactileButton("Skip##enc", ImVec2(skipW2, btnH2))) {
-                    wizard_phase_ = WizardPhase::Done;
-                    settings_->setWizardCompleted(true);
-                    settings_->save();
-                    if (!isEmbeddedDaemonRunning() && isUsingEmbeddedDaemon()) {
-                        if (!startEmbeddedDaemon()) {
-                            ui::Notifications::instance().warning(
-                                TR("wizard_daemon_start_failed"));
+                    static bool s_skipEncConfirm = false;
+                    if (!s_skipEncConfirm) {
+                        // Skipping stores private keys UNENCRYPTED — require a confirming second click.
+                        s_skipEncConfirm = true;
+                        encrypt_status_ = "Continue WITHOUT encryption? Keys will be stored unencrypted — click Skip again to confirm.";
+                    } else {
+                        s_skipEncConfirm = false;
+                        wizard_phase_ = WizardPhase::Done;
+                        settings_->setWizardCompleted(true);
+                        settings_->save();
+                        if (!isEmbeddedDaemonRunning() && isUsingEmbeddedDaemon()) {
+                            if (!startEmbeddedDaemon()) {
+                                ui::Notifications::instance().warning(
+                                    TR("wizard_daemon_start_failed"));
+                            }
                         }
+                        tryConnect();
                     }
-                    tryConnect();
                 }
                 ImGui::PopStyleVar();
                 cy += btnH2;