v1.2.0: UX audit — security fixes, accessibility, and polish

Security (P0):
- Fix sidebar remaining interactive behind lock screen
- Extend auto-lock idle detection to include active widget interactions
- Distinguish missing PIN vault from wrong PIN; auto-switch to passphrase

Blocking UX (P1):
- Add 15s timeout for encryption state check to prevent indefinite loading
- Show restart reason in loading overlay after wallet encryption
- Add Force Quit button on shutdown screen after 10s
- Warn user if embedded daemon fails to start during wizard completion

Polish (P2):
- Use configured explorer URL in Receive tab instead of hardcoded URL
- Increase request memo buffer from 256 to 512 bytes to match Send tab
- Extend notification duration to 5s for critical operations (tx sent,
  wallet encrypted, key import, backup, export)
- Add Reduce Motion accessibility setting (disables page fade + balance lerp)
- Show estimated remaining time during mining thread benchmark
- Add staleness indicator to market price data (warning after 5 min)

New i18n keys: incorrect_pin, incorrect_passphrase, pin_not_set,
restarting_after_encryption, force_quit, reduce_motion, tt_reduce_motion,
ago, wizard_daemon_start_failed

src/config/version.h

@@ -7,10 +7,10 @@
 // !! DO NOT EDIT version.h — it is generated from version.h.in by CMake.
 // !! Change the version in CMakeLists.txt: project(... VERSION x.y.z ...)
 
-#define DRAGONX_VERSION "1.1.2"
+#define DRAGONX_VERSION "1.2.0"
 #define DRAGONX_VERSION_MAJOR 1
-#define DRAGONX_VERSION_MINOR 1
-#define DRAGONX_VERSION_PATCH 2
+#define DRAGONX_VERSION_MINOR 2
+#define DRAGONX_VERSION_PATCH 0
 
 #define DRAGONX_APP_NAME "ObsidianDragon"
 #define DRAGONX_ORG_NAME "Hush"