test+style: tighten 6b upkeep/decay tests + resx period consistency (6b review)

- EmbeddedItemDatabaseTests: Assert.Single on WoodenDoor upkeep entry with ItemId/QuantityMin/QuantityMax
- DecayFormatterTests: add DecayLine_ShowsDashAndHpWhenNoDecaySeconds fact; assert HP(250) in variant test
- Strings.resx + Strings.fr.resx: append period to help.slash.decay and help.slash.upkeep values

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: HandyS11

src/RustPlusBot.Localization/Strings.fr.resx

@@ -415,7 +415,7 @@
     <value>Afficher le coût de recherche (ferraille) d'un objet</value>
   </data>
   <data name="help.slash.decay" xml:space="preserve">
-    <value>Affiche le temps de dégradation d'un objet</value>
+    <value>Affiche le temps de dégradation d'un objet.</value>
   </data>
   <data name="help.slash.help" xml:space="preserve">
     <value>Afficher ce message d'aide.</value>
@@ -436,7 +436,7 @@
     <value>Afficher le coût de recherche (ferraille) d'un objet.</value>
   </data>
   <data name="help.slash.upkeep" xml:space="preserve">
-    <value>Affiche le coût d'entretien d'un bloc de construction</value>
+    <value>Affiche le coût d'entretien d'un bloc de construction.</value>
   </data>
   <data name="help.slash.uptime" xml:space="preserve">
     <value>Afficher la disponibilité du bot.</value>

src/RustPlusBot.Localization/Strings.resx

@@ -415,7 +415,7 @@
     <value>Show an item's research scrap cost</value>
   </data>
   <data name="help.slash.decay" xml:space="preserve">
-    <value>Show an item's decay time</value>
+    <value>Show an item's decay time.</value>
   </data>
   <data name="help.slash.help" xml:space="preserve">
     <value>Show this help message.</value>
@@ -436,7 +436,7 @@
     <value>Show an item's research scrap cost.</value>
   </data>
   <data name="help.slash.upkeep" xml:space="preserve">
-    <value>Show a building block's upkeep cost</value>
+    <value>Show a building block's upkeep cost.</value>
   </data>
   <data name="help.slash.uptime" xml:space="preserve">
     <value>Show the bot's uptime.</value>

tests/RustPlusBot.Features.Commands.Tests/Formatting/DecayFormatterTests.cs

@@ -24,5 +24,16 @@ public void DecayLine_ShowsVariantsWhenPresent()
         var line = DecayLine.Format(item);
         Assert.Contains("outside", line, StringComparison.Ordinal);
         Assert.Contains("inside", line, StringComparison.Ordinal);
+        Assert.Contains("250", line, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void DecayLine_ShowsDashAndHpWhenNoDecaySeconds()
+    {
+        var item = new ItemRecord(1, "Thing", 1, null, null, null, null,
+            new DecayInfo(null, null, null, null, 100), null);
+        var line = DecayLine.Format(item);
+        Assert.Contains("—", line, StringComparison.Ordinal);
+        Assert.Contains("100", line, StringComparison.Ordinal);
     }
 }

tests/RustPlusBot.Features.ItemData.Tests/EmbeddedItemDatabaseTests.cs

@@ -72,7 +72,10 @@ public void GetById_WoodenDoor_HasUpkeep()
         var rec = _db.GetById(1729120840);
         Assert.NotNull(rec);
         Assert.NotNull(rec!.Upkeep);
-        Assert.NotEmpty(rec.Upkeep!.Entries);
+        var entry = Assert.Single(rec.Upkeep!.Entries);
+        Assert.Equal(-151838493, entry.ItemId);
+        Assert.Equal(30, entry.QuantityMin);
+        Assert.Equal(100, entry.QuantityMax);
     }
 
     [Fact]