Merge branch 'bottom-strip-shell' into bottom-strip-100vh

Pages that hardcoded `100vh` minus a guess at what sits above them came out
taller than the pane they live in, which showed up as scroll that should not
be there. They now take what the layout gives them.

Most of the `100vh` in the app turned out to be harmless, either absorbed by
flex-shrink or by a pane that scrolls anyway, and is left alone. Only the ones
with a real symptom are changed here.

Alert rules and triggered alerts also needed the AlertList tabs chain to hand
height down, since that page uses antd Tabs directly rather than RouteTab.

frontend/src/container/Home/Home.styles.scss

@@ -1,7 +1,6 @@
 .home-container {
 	display: flex;
 	flex-direction: column;
-	min-height: 100vh;
 	overflow-y: auto;
 	height: 100%;
 	width: 100%;

frontend/src/container/Licenses/Licenses.styles.scss

@@ -1,7 +1,4 @@
 .licenses-page {
-	max-height: 100vh;
-	overflow: hidden;
-
 	.licenses-page-header {
 		border-bottom: 1px solid var(--l1-border);
 		background: var(--l1-background);
@@ -32,7 +29,6 @@
 
 		.licenses-page-content {
 			flex: 1;
-			height: calc(100vh - 48px);
 			background: var(--l1-background);
 			padding: 10px 8px;
 			overflow-y: auto;

frontend/src/container/ListAlertRules/ListAlertRules.module.scss

@@ -2,7 +2,7 @@
 	display: flex;
 	flex-direction: column;
 	gap: 1rem;
-	height: calc(100vh - 62px);
+	flex: 1;
 	min-height: 400px;
 }
 

frontend/src/container/TriggeredAlerts/TriggeredAlerts.module.scss

@@ -2,7 +2,7 @@
 	display: flex;
 	flex-direction: column;
 	gap: 1rem;
-	height: calc(100vh - 62px);
+	flex: 1;
 	min-height: 400px;
 	padding-top: var(--spacing-8);
 }

frontend/src/container/Version/Version.styles.scss

@@ -1,7 +1,4 @@
 .version-container {
-	max-height: 100vh;
-	overflow: hidden;
-
 	.version-page-header {
 		border-bottom: 1px solid var(--l1-border);
 		background: var(--l1-background);

frontend/src/pages/AlertList/AlertList.styles.scss

@@ -1,4 +1,29 @@
 .alerts-container {
+	// Hands the page height down to the active tab so its content can bound itself
+	// instead of guessing with 100vh. Child combinators only, nested Tabs
+	// (Configuration) must not be caught.
+	flex: 1;
+	min-height: 0;
+
+	> .ant-tabs-content-holder {
+		display: flex;
+		flex-direction: column;
+
+		> .ant-tabs-content {
+			flex: 1;
+			min-height: 0;
+			display: flex;
+			flex-direction: column;
+
+			> .ant-tabs-tabpane-active {
+				flex: 1;
+				min-height: 0;
+				display: flex;
+				flex-direction: column;
+			}
+		}
+	}
+
 	.top-level-tab.periscope-tab {
 		padding: 2px 0;
 	}
@@ -40,5 +65,9 @@
 
 	.alert-rules-container {
 		margin-top: 10px;
+		flex: 1;
+		min-height: 0;
+		display: flex;
+		flex-direction: column;
 	}
 }

frontend/src/pages/Support/Support.styles.scss

@@ -1,7 +1,4 @@
 .support-page-container {
-	max-height: 100vh;
-	overflow: hidden;
-
 	.support-page-header {
 		border-bottom: 1px solid var(--l1-border);
 		background: var(--l1-background);

frontend/src/pages/TraceDetailsV3/TraceDetailsV3.module.scss

@@ -1,5 +1,6 @@
 .root {
-	height: calc(100vh);
+	flex: 1;
+	min-height: 0;
 	display: flex;
 	flex-direction: column;
 }

frontend/src/pages/TracesFunnelDetails/TracesFunnelDetails.styles.scss

@@ -1,13 +1,24 @@
 .traces-funnel-details {
 	display: flex;
-	// 45px -> height of the tab bar
-	height: calc(100vh - 45px);
+	height: 100%;
 
 	&__steps-config {
 		flex-shrink: 0;
 		width: 600px;
 		border-right: 1px solid var(--l1-border);
+		// Positioning context for the absolute .steps-footer.
 		position: relative;
+		display: flex;
+		flex-direction: column;
+
+		// Scoped here so the modal usage of FunnelConfiguration on trace details
+		// stays in normal flow.
+		.funnel-configuration {
+			flex: 1;
+			min-height: 0;
+			display: flex;
+			flex-direction: column;
+		}
 	}
 	&__steps-results {
 		width: 100%;

frontend/src/pages/TracesFunnelDetails/components/FunnelConfiguration/FunnelConfiguration.styles.scss

@@ -4,14 +4,17 @@
 		flex-direction: column;
 		justify-content: flex-start;
 		&.funnel-details-page {
-			height: calc(
-				100vh - 170px
-			); // 64px bottom bar + 61px configuration header + 45px page navbar
+			flex: 1;
+			min-height: 0;
+			// .steps-footer is absolute against the config column, so its 64px is
+			// reserved rather than laid out.
+			margin-bottom: 64px;
 			overflow: auto;
 		}
 	}
 
 	&__header {
+		flex-shrink: 0;
 		display: flex;
 		align-items: center;
 		justify-content: space-between;