fix(dashboard): humanize achievement-name fallback when string resource is missing

QC sweep caught the Latest Achievement card showing raw resource keys to users: 'achievement_sessions_total_1_title' instead of 'Sessions Total 1'. The catalog auto-generates ~200 achievement ids in :stats-api/AchievementCatalog and references string resources by name (e.g. 'achievement__title'), but the localized titles are not yet authored. resolveStringResource used to leak the raw key as the visible label.

Smallest improvement that helps users: when getIdentifier returns 0, strip the 'achievement_' prefix and '_title' / '_desc' / '_description' suffix, then title-case the remaining tokens. Users now see 'Sessions Total 1' / 'Total Distance 5000' / 'Active Days 7' instead of the resource key. Proper localized titles remain a separate follow-up.

Tests: 10 cases covering prefix/suffix stripping, single-word ids, consecutive underscores, suffix-in-the-middle, empty input, and the degenerate 'achievement_title' case. Verified on emulator after triggering an end-of-session AchievementWorker: card text changed from 'achievement_sessions_total_1_title' to 'Sessions Total 1'.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: adsamcik

dashboard/src/main/java/com/adsamcik/tracker/dashboard/ui/compose/cards/IdleContent.kt

@@ -24,6 +24,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
+import androidx.annotation.VisibleForTesting
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import com.adsamcik.tracker.dashboard.R
@@ -270,6 +271,29 @@ private fun LatestAchievementCard(state: DashboardUiState, modifier: Modifier =
 private fun resolveStringResource(name: String): String {
 	val context = LocalContext.current
 	val resId = remember(name, context) { context.resources.getIdentifier(name, "string", context.packageName) }
-	return if (resId != 0) stringResource(resId) else name
+	return if (resId != 0) {
+		stringResource(resId)
+	} else {
+		// No string resource defined for this achievement id yet (the catalog
+		// auto-generates ~200 ids; localized titles are still being authored).
+		// Show a readable humanized fallback instead of leaking the raw key
+		// like "achievement_sessions_total_1_title" to the user.
+		humanizeResourceKey(name)
+	}
+}
+
+@VisibleForTesting
+internal fun humanizeResourceKey(name: String): String {
+	val core = name
+		.removePrefix("achievement_")
+		.removeSuffix("_title")
+		.removeSuffix("_desc")
+		.removeSuffix("_description")
+	if (core.isBlank()) return name
+	return core.split('_')
+		.filter { it.isNotEmpty() }
+		.joinToString(" ") { token ->
+			token.replaceFirstChar { ch -> if (ch.isLowerCase()) ch.titlecase() else ch.toString() }
+		}
 }
 

dashboard/src/test/java/com/adsamcik/tracker/dashboard/ui/compose/cards/HumanizeResourceKeyTest.kt

@@ -0,0 +1,63 @@
+package com.adsamcik.tracker.dashboard.ui.compose.cards
+
+import io.kotest.matchers.shouldBe
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+
+@DisplayName("humanizeResourceKey - achievement title fallback when no string resource exists")
+class HumanizeResourceKeyTest {
+
+	@Test
+	fun `strips achievement_ prefix and _title suffix and title-cases tokens`() {
+		humanizeResourceKey("achievement_sessions_total_1_title") shouldBe "Sessions Total 1"
+	}
+
+	@Test
+	fun `also handles _desc suffix`() {
+		humanizeResourceKey("achievement_total_distance_5000_desc") shouldBe "Total Distance 5000"
+	}
+
+	@Test
+	fun `also handles _description suffix`() {
+		humanizeResourceKey("achievement_active_days_7_description") shouldBe "Active Days 7"
+	}
+
+	@Test
+	fun `unrelated keys still get title-cased (no false stripping)`() {
+		humanizeResourceKey("some_other_key") shouldBe "Some Other Key"
+	}
+
+	@Test
+	fun `keys without achievement prefix still get title-cased`() {
+		humanizeResourceKey("max_session_duration_3600000_title") shouldBe "Max Session Duration 3600000"
+	}
+
+	@Test
+	fun `empty string returns empty string`() {
+		humanizeResourceKey("") shouldBe ""
+	}
+
+	@Test
+	fun `degenerate key with only prefix gets title-cased remainder`() {
+		// "achievement_title" -> strip "achievement_" -> "title" -> "Title".
+		// Suffix-strip only matches "_title" (with separator), so "title"
+		// alone survives the strip pass and becomes a single capitalized word.
+		humanizeResourceKey("achievement_title") shouldBe "Title"
+	}
+
+	@Test
+	fun `consecutive underscores are collapsed`() {
+		humanizeResourceKey("achievement_a__b_title") shouldBe "A B"
+	}
+
+	@Test
+	fun `single-word id is title-cased`() {
+		humanizeResourceKey("achievement_walker_title") shouldBe "Walker"
+	}
+
+	@Test
+	fun `does not double-strip suffix that appears in the middle`() {
+		// "title" inside the body should not be touched -- only suffix.
+		humanizeResourceKey("achievement_title_holder_title") shouldBe "Title Holder"
+	}
+}