fix(amsat): align the status grid to UTC calendar days, one stripe per slot

Two defects in our own AMSAT page, both found by auditing the change that exposed
them.

The day columns claimed to be dates but were a rolling window anchored on the
fetch time. Fetching at 06:07 UTC put 17.9 hours of yesterday into the cell
labelled today; measured against a live amsat.org page of 1021 reports, 73% of
them landed in the wrong day column and none matched the official cell. Days are
now UTC calendar days and slots are fixed UTC bands - slot 0 is 22:00-24:00, slot
11 is 00:00-02:00 - so a cell's contents match its label whenever it is fetched.

The day cell painted one colour for the whole day, taken from the first slot that
had a report, so a satellite that worked all morning and failed all afternoon
looked identical to one that worked once - the reported symptom. It now draws one
stripe per two-hour slot in the same 64x28 dp footprint. Twelve stripes are about
5 dp each, roughly 15 px at 440 dpi, and runs of the same status merge visually,
so a day reads as a few blocks rather than twelve lines. Every density from ldpi
up allocates all twelve without dropping one, and the 4 dp corner radius leaves
95% of the end stripes visible. The report count text is gone; tapping a day
still lists every report from it, which was already the richer view.

buildStatuses and ApiReport are internal rather than private so the grid contract
can be tested. AmSatSlotBuildTest drives it directly: fetchStatus cannot be
tested here because the parsing around it uses Android's JSONObject, a JVM stub
that makes every call return null - eight of nine tests written against it failed
for that reason before being rewritten.

Also corrects three KDoc comments claiming 5 days when the code builds 3, and
records in AGENTS.md that the status colours are ARGB literals in core:data,
duplicated in MainTheme, which anything needing themeable or colour-blind-safe
colours has to fix first.

feature/status/src/main/java/com/rtbishop/look4sat/feature/status/SatStatusScreen.kt

@@ -9,6 +9,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
@@ -48,7 +49,6 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.rtbishop.look4sat.core.domain.model.SatDay
 import com.rtbishop.look4sat.core.domain.model.SatReport
-import com.rtbishop.look4sat.core.domain.model.SatSlot
 import com.rtbishop.look4sat.core.domain.model.SatStatus
 import com.rtbishop.look4sat.core.domain.repository.IContainerProvider
 import com.rtbishop.look4sat.core.presentation.InfoDialog
@@ -235,7 +235,6 @@ private fun HeaderRow(statuses: List<SatStatus>) {
 /** Satellite row: name takes remaining width; day tiles are fixed-width (tablet-safe). */
 @Composable
 private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
-    val noReportGray = 0xFFC0C0C0L
     Row(
         modifier = Modifier.fillMaxWidth().padding(vertical = 2.dp),
         verticalAlignment = Alignment.CenterVertically
@@ -248,9 +247,8 @@ private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
             modifier = Modifier.weight(1f).padding(end = 4.dp)
         )
         status.days.forEach { day ->
-            val slot = day.slots.firstOrNull { it.statusColor != noReportGray } ?: day.slots.first()
             DayCell(
-                slot = slot,
+                day = day,
                 modifier = Modifier.width(TILE_WIDTH).padding(horizontal = 2.dp),
                 onClick = { onClickDay(day) }
             )
@@ -258,20 +256,35 @@ private fun StatusRow(status: SatStatus, onClickDay: (SatDay) -> Unit) {
     }
 }
 
-/** Day block: newest reported status among the day's 12 slots; gray when none. */
+/**
+ * One day as a stripe per two-hour slot.
+ *
+ * Showing a single colour per day hid the shape of the day: a satellite that worked all
+ * morning and failed all afternoon looked identical to one that worked once. At 64 dp
+ * across, twelve stripes are about 5 dp each - roughly 15 px on a 440 dpi screen - and
+ * runs of the same status merge visually, so a typical day reads as a few blocks rather
+ * than twelve thin lines.
+ *
+ * Stripes run newest-first, left to right, matching both the slot order the repository
+ * produces and the day columns in the header. Time therefore flows right to left within
+ * a cell, which is the opposite of the usual convention but consistent with the rest of
+ * the grid.
+ */
 @Composable
-private fun DayCell(slot: SatSlot, modifier: Modifier, onClick: () -> Unit) {
-    val color = Color(slot.statusColor)
-    Box(
+private fun DayCell(day: SatDay, modifier: Modifier, onClick: () -> Unit) {
+    Row(
         modifier = modifier
             .height(28.dp)
             .clip(RoundedCornerShape(4.dp))
-            .background(color)
-            .clickable(onClick = onClick),
-        contentAlignment = Alignment.Center
+            .clickable(onClick = onClick)
     ) {
-        if (slot.count > 0) {
-            Text(text = slot.count.toString(), fontSize = 13.sp, fontWeight = FontWeight.Bold, color = Color.White)
+        day.slots.forEach { slot ->
+            Box(
+                modifier = Modifier
+                    .weight(1f)
+                    .fillMaxHeight()
+                    .background(Color(slot.statusColor))
+            )
         }
     }
 }