Fix dashboard info-icon rendering and profile <null> display

Info badge: the icon was a PanelContainer using StyleBoxFlat corner
radius to fake a circle, with the radius exceeding half the box size,
causing visible artifacts. Replaced with a custom-drawn Control
(draw_arc) for a clean ring at any size, and added a hover tooltip
explaining what each stat card measures.

Profile: Dictionary.get(key, default) only falls back when the key is
missing, not when it's present with a null value, so a null
displayName rendered as the literal string "<null>" (str(null) in
GDScript) - including pre-filling the edit-profile dialog with it.
Added a shared string_field() helper that treats null the same as
missing, applied everywhere an account/preference string field is
displayed or edited.

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

scripts/ui/dashboard_info_badge.gd

@@ -0,0 +1,13 @@
+extends Control
+
+var ring_color := Color.WHITE
+
+
+func set_ring_color(next_color: Color) -> void:
+	ring_color = next_color
+	queue_redraw()
+
+
+func _draw() -> void:
+	var radius: float = minf(size.x, size.y) * 0.5 - 1.0
+	draw_arc(size * 0.5, radius, 0.0, TAU, 48, ring_color, 1.2, true)

scripts/ui/dashboard_info_badge.gd.uid

@@ -0,0 +1 @@
+uid://cnnscljyarxaa

scripts/ui/dashboard_screen.gd

@@ -5,6 +5,7 @@ const TrendChart := preload("res://scripts/ui/dashboard_chart.gd")
 const ActivityChart := preload("res://scripts/ui/dashboard_activity_chart.gd")
 const DashboardSparkline := preload("res://scripts/ui/dashboard_sparkline.gd")
 const DashboardSegmentBar := preload("res://scripts/ui/dashboard_segment_bar.gd")
+const DashboardInfoBadge := preload("res://scripts/ui/dashboard_info_badge.gd")
 
 var main: Control
 var scroll: ScrollContainer
@@ -82,15 +83,18 @@ func _build() -> void:
 
 	qbank_sparkline = DashboardSparkline.new()
 	qbank_sparkline.custom_minimum_size = Vector2(0, 34)
-	_add_stat_card("qbank", "Question Bank Rating", "book-open", Brand.ROYAL_BLUE, qbank_sparkline)
+	_add_stat_card("qbank", "Question Bank Rating", "book-open", Brand.ROYAL_BLUE, qbank_sparkline,
+		"Your Elo-style rating from Question Bank answers, weighted by each question's difficulty.")
 
 	ccs_sparkline = DashboardSparkline.new()
 	ccs_sparkline.custom_minimum_size = Vector2(0, 34)
-	_add_stat_card("ccs", "CCS Rating", "stethoscope", Brand.SUCCESS, ccs_sparkline)
+	_add_stat_card("ccs", "CCS Rating", "stethoscope", Brand.SUCCESS, ccs_sparkline,
+		"Your Elo-style rating from timed CCS case performance, weighted by each case's difficulty.")
 
 	readiness_segment_bar = DashboardSegmentBar.new()
 	readiness_segment_bar.custom_minimum_size = Vector2(0, 10)
-	_add_stat_card("readiness", "Exam Readiness", "chart-no-axes-column-increasing", Brand.PURPLE, readiness_segment_bar)
+	_add_stat_card("readiness", "Exam Readiness", "chart-no-axes-column-increasing", Brand.PURPLE, readiness_segment_bar,
+		"Predicted pass probability from your most recent completed exam simulation.")
 
 	accuracy_progress_bar = ProgressBar.new()
 	accuracy_progress_bar.show_percentage = false
@@ -98,7 +102,8 @@ func _build() -> void:
 	accuracy_progress_bar.max_value = 100.0
 	accuracy_progress_bar.custom_minimum_size = Vector2(0, 10)
 	_style_progress(accuracy_progress_bar, Brand.AMBER)
-	_add_stat_card("accuracy", "Average Score", "star", Brand.AMBER, accuracy_progress_bar)
+	_add_stat_card("accuracy", "Average Score", "star", Brand.AMBER, accuracy_progress_bar,
+		"Your first-attempt accuracy across your most recent 100 answered questions.")
 
 	analytics_grid = GridContainer.new()
 	analytics_grid.columns = 2
@@ -415,28 +420,23 @@ func _render_recent(items: Array) -> void:
 		recent_list.add_child(row)
 
 
-func _info_badge(dark: bool) -> Control:
-	var badge := PanelContainer.new()
-	badge.custom_minimum_size = Vector2(15, 15)
+func _info_badge(dark: bool, tooltip: String) -> Control:
+	var badge := DashboardInfoBadge.new()
+	badge.custom_minimum_size = Vector2(16, 16)
 	badge.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
-	var box := StyleBoxFlat.new()
-	box.bg_color = Color.TRANSPARENT
-	box.border_color = Brand.muted_color(dark)
-	box.set_border_width_all(1)
-	box.set_corner_radius_all(8)
-	box.content_margin_left = 0
-	box.content_margin_right = 0
-	box.content_margin_top = 0
-	box.content_margin_bottom = 0
-	badge.add_theme_stylebox_override("panel", box)
+	badge.mouse_filter = Control.MOUSE_FILTER_STOP
+	badge.tooltip_text = tooltip
+	badge.set_ring_color(Brand.muted_color(dark))
 	var glyph := _label("i", 10, Brand.muted_color(dark), true)
+	glyph.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
 	glyph.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
 	glyph.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
+	glyph.mouse_filter = Control.MOUSE_FILTER_IGNORE
 	badge.add_child(glyph)
 	return badge
 
 
-func _add_stat_card(key: String, title: String, icon_name: String, accent: Color, bottom_visual: Control) -> void:
+func _add_stat_card(key: String, title: String, icon_name: String, accent: Color, bottom_visual: Control, info_tooltip: String) -> void:
 	var dark := UIThemeService.is_dark_mode()
 	var card_content := VBoxContainer.new()
 	card_content.custom_minimum_size = Vector2(220, 0)
@@ -461,7 +461,7 @@ func _add_stat_card(key: String, title: String, icon_name: String, accent: Color
 	title_label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
 	title_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
 	header.add_child(title_label)
-	header.add_child(_info_badge(dark))
+	header.add_child(_info_badge(dark, info_tooltip))
 
 	var value := _label("--", 28, Brand.text_color(dark), true)
 	card_content.add_child(value)

scripts/ui/progress_profile.gd

@@ -258,19 +258,19 @@ func _render() -> void:
 		return
 	var account: Dictionary = AccountProfileService.account
 	var prefs: Dictionary = AccountProfileService.preferences
-	var username := str(account.get("username", AuthState.username))
-	var display_name := str(account.get("displayName", "")).strip_edges()
+	var username := string_field(account, "username", AuthState.username)
+	var display_name := string_field(account, "displayName").strip_edges()
 	profile_name.text = username if display_name.is_empty() else display_name
-	var email := str(account.get("email", "")).strip_edges()
+	var email := string_field(account, "email").strip_edges()
 	profile_identity.text = "@%s" % username if email.is_empty() else "@%s  |  %s" % [username, email]
-	var role := str(account.get("role", AuthState.role)).capitalize()
-	var created := _date_only(str(account.get("createdUtc", "")))
+	var role := string_field(account, "role", AuthState.role).capitalize()
+	var created := _date_only(string_field(account, "createdUtc"))
 	profile_meta.text = role if created.is_empty() else "%s  |  Member since %s" % [role, created]
 	_render_connected_accounts(account.get("connectedProviders", []), account.get("availableProviders", []))
-	(identity_values["exam"] as Label).text = _date_only(str(prefs.get("targetExamDate", "")), "Not scheduled")
-	(identity_values["stage"] as Label).text = _friendly(str(prefs.get("preparationStage", "pre_dedicated")))
+	(identity_values["exam"] as Label).text = _date_only(string_field(prefs, "targetExamDate"), "Not scheduled")
+	(identity_values["stage"] as Label).text = _friendly(string_field(prefs, "preparationStage", "pre_dedicated"))
 	(identity_values["goal"] as Label).text = "%d hours / week" % int(prefs.get("weeklyGoalHours", 10))
-	(identity_values["mode"] as Label).text = _friendly(str(prefs.get("preferredStudyMode", "mixed")))
+	(identity_values["mode"] as Label).text = _friendly(string_field(prefs, "preferredStudyMode", "mixed"))
 	var data: Dictionary = DashboardService.data
 	_set_metric("qbank", str(int(data.get("questionBankRating", QuestionBankService.overall_elo))))
 	_set_metric("ccs", str(int(data.get("ccsRating", CCSService.rating.get("elo", 1000)))))
@@ -353,7 +353,7 @@ func _render_outcome() -> void:
 		outcome_delete.visible = false
 		return
 	outcome_score.value = int(outcome.get("officialScore", 200))
-	outcome_date.text = _date_only(str(outcome.get("examDate", "")))
+	outcome_date.text = _date_only(string_field(outcome, "examDate"))
 	outcome_consent.button_pressed = true
 	outcome_status.text = "Saved score %d for %s." % [int(outcome_score.value), outcome_date.text]
 	outcome_delete.visible = true
@@ -363,12 +363,12 @@ func _open_profile_editor() -> void:
 	var dialog := _dialog("Edit profile")
 	var display := LineEdit.new()
 	display.placeholder_text = "Display name"
-	display.text = str(AccountProfileService.account.get("displayName", ""))
+	display.text = string_field(AccountProfileService.account, "displayName")
 	_style_field(display)
 	dialog.add_field(display)
 	var email := LineEdit.new()
 	email.placeholder_text = "Email address"
-	email.text = str(AccountProfileService.account.get("email", ""))
+	email.text = string_field(AccountProfileService.account, "email")
 	_style_field(email)
 	dialog.add_field(email)
 	dialog.confirmed.connect(func(): AccountProfileService.update_account(display.text, email.text))
@@ -381,18 +381,18 @@ func _open_study_editor() -> void:
 	var dialog := _dialog("Edit study identity")
 	var exam := LineEdit.new()
 	exam.placeholder_text = "Target exam date: YYYY-MM-DD"
-	exam.text = _date_only(str(prefs.get("targetExamDate", "")))
+	exam.text = _date_only(string_field(prefs, "targetExamDate"))
 	_style_field(exam)
 	dialog.add_field(exam)
 	var stage := OptionButton.new()
-	_add_options(stage, [["Pre-dedicated", "pre_dedicated"], ["Dedicated", "dedicated"], ["Final review", "final_review"]], str(prefs.get("preparationStage", "pre_dedicated")))
+	_add_options(stage, [["Pre-dedicated", "pre_dedicated"], ["Dedicated", "dedicated"], ["Final review", "final_review"]], string_field(prefs, "preparationStage", "pre_dedicated"))
 	dialog.add_field(stage)
 	var goal := OptionButton.new()
 	for hours in [5, 10, 15, 20, 25]: goal.add_item("%d hours per week" % hours, hours)
 	_select_id(goal, int(prefs.get("weeklyGoalHours", 10)))
 	dialog.add_field(goal)
 	var mode := OptionButton.new()
-	_add_options(mode, [["Mixed", "mixed"], ["Question Bank", "question_bank"], ["CCS", "ccs"], ["Exam simulation", "exam_simulation"]], str(prefs.get("preferredStudyMode", "mixed")))
+	_add_options(mode, [["Mixed", "mixed"], ["Question Bank", "question_bank"], ["CCS", "ccs"], ["Exam simulation", "exam_simulation"]], string_field(prefs, "preferredStudyMode", "mixed"))
 	dialog.add_field(mode)
 	dialog.confirmed.connect(func():
 		AccountProfileService.update_preferences(exam.text, str(stage.get_item_metadata(stage.selected)), goal.get_selected_id(), str(mode.get_item_metadata(mode.selected))))
@@ -603,8 +603,13 @@ func _clear(container: Container) -> void:
 		child.free()
 
 
+static func string_field(source: Dictionary, key: String, fallback: String = "") -> String:
+	var value = source.get(key)
+	return fallback if value == null else str(value)
+
+
 func _date_only(value: String, fallback: String = "") -> String:
-	if value.is_empty() or value == "<null>": return fallback
+	if value.is_empty(): return fallback
 	return value.left(10)