Gate Rz Coins on correct-first-try-within-time-limit; match coin-flight animation to it

Credits were previously awarded on any first attempt regardless of
correctness or timing. The award now requires the first-ever attempt
to be correct (record.Attempt.IsCorrect) and submitted before the
adaptive per-question timer expired (new MetTimeLimit request field,
computed client-side from the same elapsed/target comparison that
already drives the visible countdown bar). The coin-flight animation
in question_player.gd now only plays when both conditions are met
(BlockSessionService.submit_core_attempt's existing "mastered" flag
plus met_time_limit), so the effect never promises a coin that isn't
actually earned.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

project.godot

@@ -13,14 +13,13 @@ config_version=5
 config/name="RanaZe: Step 3 Trainer"
 config/version="pre-alpha"
 run/main_scene="res://scenes/main.tscn"
-config/features=PackedStringArray("4.6", "GL Compatibility")
-config/icon="res://assets/branding/ranaze-app-icon.png"
 config/use_custom_user_dir=true
 config/custom_user_dir_name="MedMind"
+config/features=PackedStringArray("4.6", "GL Compatibility")
 boot_splash/bg_color=Color(0.019607844, 0.02745098, 0.05882353, 1)
+boot_splash/stretch_mode=0
 boot_splash/image="res://assets/branding/ranaze-mark.png"
-boot_splash/fullsize=false
-boot_splash/use_filter=true
+config/icon="res://assets/branding/ranaze-app-icon.png"
 
 [autoload]
 
@@ -58,9 +57,9 @@ window/stretch/aspect="expand"
 
 [rendering]
 
+rendering_device/driver.windows="d3d12"
 renderer/rendering_method="gl_compatibility"
 renderer/rendering_method.mobile="gl_compatibility"
-rendering_device/driver.windows="d3d12"
 textures/vram_compression/import_etc2_astc=true
 
 [step3]