diff --git a/app/components/Code/Viewer.vue b/app/components/Code/Viewer.vue
index 90bcf0c22..398585bdb 100644
--- a/app/components/Code/Viewer.vue
+++ b/app/components/Code/Viewer.vue
@@ -11,25 +11,59 @@ const emit = defineEmits<{
 
 const codeRef = useTemplateRef('codeRef')
 
-// Generate line numbers array
-const lineNumbers = computed(() => {
-  return Array.from({ length: props.lines }, (_, i) => i + 1)
-})
+const LINE_HEIGHT_PX = 24
+const lineMultipliers = ref<number[]>([])
 
-// Used for CSS calculation of line number column width
-const lineDigits = computed(() => {
-  return String(props.lines).length
-})
+function updateLineMultipliers() {
+  if (!codeRef.value) return
+  const lines = codeRef.value.querySelectorAll<HTMLElement>('code > .line')
+  const result: number[] = Array.from({ length: lines.length })
+  for (let i = 0; i < lines.length; i++)
+    result[i] = Math.max(1, Math.round(lines[i]!.offsetHeight / LINE_HEIGHT_PX))
+  lineMultipliers.value = result
+}
+
+watch(
+  () => props.html,
+  () => nextTick(updateLineMultipliers),
+  { immediate: true },
+)
+useResizeObserver(codeRef, updateLineMultipliers)
+
+const lineDigits = computed(() => String(props.lines).length)
 
-// Check if a line is selected
 function isLineSelected(lineNum: number): boolean {
   if (!props.selectedLines) return false
   return lineNum >= props.selectedLines.start && lineNum <= props.selectedLines.end
 }
 
-// Handle line number click
-function onLineClick(lineNum: number, event: MouseEvent) {
-  emit('lineClick', lineNum, event)
+const lineNumbersHtml = computed(() => {
+  const multipliers = lineMultipliers.value
+  const total = props.lines
+  const parts: string[] = []
+
+  for (let i = 0; i < total; i++) {
+    const num = i + 1
+    const cls = isLineSelected(num)
+      ? 'bg-yellow-500/20 text-fg'
+      : 'text-fg-subtle hover:text-fg-muted'
+    parts.push(
+      `<a id="L${num}" href="#L${num}" tabindex="-1" class="line-number block px-3 py-0 font-mono text-sm leading-6 cursor-pointer transition-colors no-underline ${cls}" data-line="${num}">${num}</a>`,
+    )
+
+    const extra = (multipliers[i] ?? 1) - 1
+    for (let j = 0; j < extra; j++) parts.push('<span class="block px-3 leading-6">\u00a0</span>')
+  }
+
+  return parts.join('')
+})
+
+function onLineNumberClick(event: MouseEvent) {
+  const target = (event.target as HTMLElement).closest<HTMLAnchorElement>('a[data-line]')
+  if (!target) return
+  event.preventDefault()
+  const lineNum = Number(target.dataset.line)
+  if (lineNum) emit('lineClick', lineNum, event)
 }
 
 // Apply highlighting to code lines when selection changes
@@ -86,36 +120,21 @@ watch(
 </script>
 
 <template>
-  <div class="code-viewer flex min-h-full max-w-full">
-    <!-- Line numbers column -->
+  <div class="code-viewer flex min-h-full max-w-full" :style="{ '--line-digits': lineDigits }">
+    <!-- Line numbers column — raw HTML + event delegation to avoid v-for overhead on large files -->
+    <!-- eslint-disable vue/no-v-html -->
     <div
       class="line-numbers shrink-0 bg-bg-subtle border-ie border-solid border-border text-end select-none relative"
-      :style="{ '--line-digits': lineDigits }"
       aria-hidden="true"
-    >
-      <!-- This needs to be a native <a> element, because `LinkBase` (or specifically `NuxtLink`) does not seem to work when trying to prevent default behavior (jumping to the anchor) -->
-      <a
-        v-for="lineNum in lineNumbers"
-        :id="`L${lineNum}`"
-        :key="lineNum"
-        :href="`#L${lineNum}`"
-        tabindex="-1"
-        class="line-number block px-3 py-0 font-mono text-sm leading-6 cursor-pointer transition-colors no-underline"
-        :class="[
-          isLineSelected(lineNum)
-            ? 'bg-yellow-500/20 text-fg'
-            : 'text-fg-subtle hover:text-fg-muted',
-        ]"
-        @click.prevent="onLineClick(lineNum, $event)"
-      >
-        {{ lineNum }}
-      </a>
-    </div>
+      v-html="lineNumbersHtml"
+      @click="onLineNumberClick"
+    />
+    <!-- eslint-enable vue/no-v-html -->
 
     <!-- Code content -->
-    <div class="code-content flex-1 overflow-x-auto min-w-0">
+    <div class="code-content">
       <!-- eslint-disable vue/no-v-html -- HTML is generated server-side by Shiki -->
-      <div ref="codeRef" class="code-lines min-w-full w-fit" v-html="html" />
+      <div ref="codeRef" class="code-lines" v-html="html" />
       <!-- eslint-enable vue/no-v-html -->
     </div>
   </div>
@@ -124,46 +143,56 @@ watch(
 <style scoped>
 .code-viewer {
   font-size: 14px;
+  /* 1ch per digit + 1.5rem (px-3 * 2) padding */
+  --line-numbers-width: calc(var(--line-digits) * 1ch + 1.5rem);
 }
 
 .line-numbers {
-  /* 1ch per digit + 1.5rem (px-3 * 2) padding */
-  min-width: calc(var(--line-digits) * 1ch + 1.5rem);
+  min-width: var(--line-numbers-width);
+}
+
+.code-content {
+  flex: 1;
+  min-width: 0;
+  max-width: calc(100% - var(--line-numbers-width));
 }
 
-.code-content :deep(pre) {
+.code-content:deep(pre) {
   margin: 0;
   padding: 0;
   background: transparent !important;
   overflow: visible;
+  max-width: 100%;
 }
 
-.code-content :deep(code) {
+.code-content:deep(code) {
   display: block;
   padding: 0 1rem;
   background: transparent !important;
+  max-width: 100%;
 }
 
-.code-content :deep(.line) {
-  display: block;
+.code-content:deep(.line) {
+  display: flex;
+  flex-wrap: wrap;
   /* Ensure consistent height matching line numbers */
-  line-height: 24px;
-  min-height: 24px;
-  max-height: 24px;
-  white-space: pre;
+  line-height: calc(v-bind(LINE_HEIGHT_PX) * 1px);
+  min-height: calc(v-bind(LINE_HEIGHT_PX) * 1px);
+  white-space: pre-wrap;
   overflow: hidden;
   transition: background-color 0.1s;
+  max-width: 100%;
 }
 
 /* Highlighted lines in code content - extend full width with negative margin */
-.code-content :deep(.line.highlighted) {
+.code-content:deep(.line.highlighted) {
   @apply bg-yellow-500/20;
   margin: 0 -1rem;
   padding: 0 1rem;
 }
 
 /* Clickable import links */
-.code-content :deep(.import-link) {
+.code-content:deep(.import-link) {
   color: inherit;
   text-decoration: underline;
   text-decoration-style: dotted;
@@ -175,7 +204,7 @@ watch(
   cursor: pointer;
 }
 
-.code-content :deep(.import-link:hover) {
+.code-content:deep(.import-link:hover) {
   text-decoration-style: solid;
   text-decoration-color: #9ecbff; /* syntax.str - light blue */
 }
diff --git a/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue b/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue
index 343ec2531..5d3fb67dd 100644
--- a/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue
+++ b/app/pages/package-code/[[org]]/[packageName]/v/[version]/[...filePath].vue
@@ -347,10 +347,10 @@ defineOgImageComponent('Default', {
     </div>
 
     <!-- Main content: file tree + file viewer -->
-    <div v-else-if="fileTree" class="flex flex-1" dir="ltr">
+    <div v-else-if="fileTree" class="main-content flex flex-1" dir="ltr">
       <!-- File tree sidebar - sticky with internal scroll -->
       <aside
-        class="w-64 lg:w-72 border-ie border-border shrink-0 hidden md:block bg-bg-subtle sticky top-25 self-start h-[calc(100vh-7rem)] overflow-y-auto"
+        class="file-tree border-ie border-border shrink-0 hidden md:block bg-bg-subtle sticky top-25 self-start h-[calc(100vh-7rem)] overflow-y-auto"
       >
         <CodeFileTree
           :tree="fileTree.tree"
@@ -361,7 +361,7 @@ defineOgImageComponent('Default', {
       </aside>
 
       <!-- File content / Directory listing - sticky with internal scroll on desktop -->
-      <div class="flex-1 min-w-0 self-start">
+      <div class="file-viewer flex-1 min-w-0 self-start">
         <div
           class="sticky z-10 top-25 bg-bg border-b border-border px-4 py-2 flex items-center justify-between gap-2 text-nowrap overflow-x-auto max-w-full"
         >
@@ -584,3 +584,21 @@ defineOgImageComponent('Default', {
     </ClientOnly>
   </main>
 </template>
+
+<style scoped>
+.main-content {
+  --sidebar-space: calc(var(--spacing) * 64);
+}
+@screen lg {
+  .main-content {
+    --sidebar-space: calc(var(--spacing) * 72);
+  }
+}
+
+.file-tree {
+  width: var(--sidebar-space);
+}
+.file-viewer {
+  width: calc(100% - var(--sidebar-space));
+}
+</style>
diff --git a/app/utils/chart-data-buckets.ts b/app/utils/chart-data-buckets.ts
index 1165c4541..1cc4a4330 100644
--- a/app/utils/chart-data-buckets.ts
+++ b/app/utils/chart-data-buckets.ts
@@ -34,17 +34,13 @@ export function buildWeeklyEvolution(
   if (sorted.length === 0) return []
 
   const rangeStartDate = parseIsoDate(rangeStartIso)
+  const rangeEndDate = parseIsoDate(rangeEndIso)
 
-  // Align from last day with actual data (npm has 1-2 day delay, today is incomplete)
-  const lastNonZero = sorted.findLast(d => d.value > 0)
-  const pickerEnd = parseIsoDate(rangeEndIso)
-  const effectiveEnd = lastNonZero ? parseIsoDate(lastNonZero.day) : pickerEnd
-  const rangeEndDate = effectiveEnd.getTime() < pickerEnd.getTime() ? effectiveEnd : pickerEnd
-
-  // Group into 7-day buckets from END backwards
   const buckets = new Map<number, number>()
+
   for (const item of sorted) {
-    const offset = Math.floor((rangeEndDate.getTime() - parseIsoDate(item.day).getTime()) / DAY_MS)
+    const itemDate = parseIsoDate(item.day)
+    const offset = Math.floor((rangeEndDate.getTime() - itemDate.getTime()) / DAY_MS)
     if (offset < 0) continue
     const idx = Math.floor(offset / 7)
     buckets.set(idx, (buckets.get(idx) ?? 0) + item.value)
diff --git a/test/unit/app/utils/chart-data-buckets.spec.ts b/test/unit/app/utils/chart-data-buckets.spec.ts
index 8538f1813..141a9688c 100644
--- a/test/unit/app/utils/chart-data-buckets.spec.ts
+++ b/test/unit/app/utils/chart-data-buckets.spec.ts
@@ -84,7 +84,7 @@ describe('buildWeeklyEvolution', () => {
     expect(result[1]!.weekEnd).toBe('2025-03-10')
   })
 
-  it('aligns from last non-zero data day, ignoring trailing zeros', () => {
+  it('always aligns from rangeEnd, even with trailing zeros', () => {
     const daily = [
       { day: '2025-03-01', value: 10 },
       { day: '2025-03-02', value: 10 },
@@ -99,10 +99,14 @@ describe('buildWeeklyEvolution', () => {
 
     const result = buildWeeklyEvolution(daily, '2025-03-01', '2025-03-09')
 
-    expect(result).toHaveLength(1)
-    expect(result[0]!.value).toBe(70)
+    // Bucket 0: 03-03..03-09 = 50, Bucket 1: 03-01..03-02 (partial, scaled)
+    expect(result).toHaveLength(2)
     expect(result[0]!.weekStart).toBe('2025-03-01')
-    expect(result[0]!.weekEnd).toBe('2025-03-07')
+    expect(result[0]!.weekEnd).toBe('2025-03-02')
+    expect(result[0]!.value).toBe(Math.round((20 * 7) / 2))
+    expect(result[1]!.weekStart).toBe('2025-03-03')
+    expect(result[1]!.weekEnd).toBe('2025-03-09')
+    expect(result[1]!.value).toBe(50)
   })
 
   it('returns empty array for empty input', () => {