homepage: bento 3-up + 300x600 inline; word-safe excerpt; bigger sponsor logos

- FeaturedBentoFromDb: row below the hero is now a 3-up rail on the left
  with the Blackmagic 300x600 on the right, aligned with the hero's right
  edge. SidebarAdStack skips that 300x600 so the article-feed sidebar
  starts with the 300x250 stack instead.
- cleanExcerpt: render-time word-snap for excerpts that were hard-cut at a
  byte count (Matrox 50-years showed "Since 1976, the co" mid-word). Used
  on the bento hero subhead and the article-feed cards.
- SponsorLogoStrip: now also pulls every tracked_companies.featured=true
  brand (Rode, TBC Consoles, Plura, Autocue, Autoscript, Filmcraft,
  Lectrosonics, Prompter People, SanDisk, Sennheiser), and logos go from
  h-10/h-12 max-w-140 → h-14/h-16 max-w-180 with thicker padding.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/home-page/components/ArticleFeed.tsx

@@ -4,6 +4,7 @@ import AppImage from "@/components/ui/AppImage";
 import SidebarAdStack from "@/components/SidebarAdStack";
 import AdImage from "@/components/AdImage";
 import { rotateAll, type Ad } from "@/lib/ads";
+import { cleanExcerpt } from "@/lib/articles/excerpt";
 import { PersonIcon, ChevronLeftIcon, ChevronRightIcon, SearchIcon, CloseIcon } from "@/components/ui/Icons";
 import StarRating from "@/components/StarRating";
 import Link from "next/link";
@@ -632,7 +633,7 @@ export default function ArticleFeed() {
                         </Link>
                       </h3>
                       <p className="font-body text-[#777] text-sm leading-relaxed line-clamp-2 mb-2 md:mb-2.5 hidden sm:block">
-                        {article?.excerpt}
+                        {cleanExcerpt(article?.excerpt)}
                       </p>
                       <div className="mb-2">
                         <StarRating seed={article?.slug || article?.title || ""} publishedAt={article?.date} size="sm" />
@@ -807,10 +808,11 @@ export default function ArticleFeed() {
           )}
         </div>
 
-        {/* Sidebar — Blackmagic 300x600 fixed at top + every 300x250 banner stacked */}
+        {/* Sidebar — 300x250 banners stacked. The 300x600 is rendered up in
+            FeaturedBento alongside the 3-up rail, so it's skipped here. */}
         <aside aria-label="Advertisements">
           <div className="lg:sticky lg:top-24">
-            <SidebarAdStack />
+            <SidebarAdStack skipTop600 />
           </div>
         </aside>
       </div>