Fix GitHub preview repo selection and Three.js bar tooltip vertical alignment (#39)

* fix: repair portfolio preview repos and threejs bar tooltip positioning

Agent-Logs-Url: https://github.com/amide-init/gitfolio/sessions/b6cd410b-3698-4194-9ac2-b3a24a558618

Co-authored-by: amide-init <31934584+amide-init@users.noreply.github.com>

* refactor: name threejs bar tooltip offset constant

Agent-Logs-Url: https://github.com/amide-init/gitfolio/sessions/b6cd410b-3698-4194-9ac2-b3a24a558618

Co-authored-by: amide-init <31934584+amide-init@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: amide-init <31934584+amide-init@users.noreply.github.com>

Author: Copilot

src/components/PortfolioPreviewModal.tsx

@@ -270,7 +270,7 @@ type Props = {
   onClose: () => void
 }
 
-export function PortfolioPreviewModal({ user, repos: _, allRepos, onClose }: Props) {
+export function PortfolioPreviewModal({ user, repos, allRepos, onClose }: Props) {
   // Lock body scroll
   useEffect(() => {
     const prev = document.body.style.overflow
@@ -283,7 +283,7 @@ export function PortfolioPreviewModal({ user, repos: _, allRepos, onClose }: Pro
 
   const hero     = buildHero(user, allRepos)
   const snapshot = buildSnapshot(user, allRepos)
-  const repos    = buildRepos(allRepos)
+  const previewRepos = buildRepos(repos.length > 0 ? repos : allRepos)
   const stats    = buildStats(user, allRepos)
 
   return createPortal(
@@ -328,7 +328,7 @@ export function PortfolioPreviewModal({ user, repos: _, allRepos, onClose }: Pro
         <GitHubSection
           title="GitHub"
           body={`${user.name || user.login}'s public repositories on GitHub.`}
-          repos={repos}
+          repos={previewRepos}
         />
         <StatsSection stats={stats} />
 

src/templates/threejs/ThreeBarChart.tsx

@@ -14,6 +14,7 @@ interface ThreeBarChartProps {
 }
 
 const EASE_DURATION = 1100 // ms
+const TOOLTIP_TOP_OFFSET = 0.1
 
 function easeOutCubic(t: number) {
   return 1 - Math.pow(1 - t, 3)
@@ -158,7 +159,7 @@ export default function ThreeBarChart({
       if (hoveredIdx >= 0) {
         const d = data[hoveredIdx]
         const pos3 = bars[hoveredIdx].mesh.position.clone()
-        pos3.y = bars[hoveredIdx].mesh.scale.y * bars[hoveredIdx].targetH
+        pos3.y = bars[hoveredIdx].mesh.scale.y + TOOLTIP_TOP_OFFSET
         const projected = pos3.clone().project(camera)
         setTooltip({
           x: ((projected.x + 1) / 2) * w,