fix(feed): keep the row's columns growing with the text-size setting

My last commit made ROW_COL the literal source of the widths — and froze
them, because inline pixels can't follow the root font that Settings'
text slider drives (0.9-1.3). Measured at 130%: the channel box stuck at
128px while its text wanted 152 and the meta cell, being a rem grid, grew
to 156 — one row in two unit systems.

The classes come back and ROW_COL documents them, saying plainly that the
two are matched by hand and why they have to be. Chasing a comment's
literal truth cost a property I'd already verified.

frontend/src/components/VideoCard.tsx

@@ -322,24 +322,28 @@ function Thumb({
   );
 }
 
-// The one-line row's column widths, in ONE place: the boxes below take these directly (as inline
-// widths — Tailwind can't accept a runtime value), and so do the drop-out thresholds. Two
-// hand-written sets would drift, and the symptom would be silent: a column appearing just before
-// it actually fits. Each is measured against the worst case in the LIBRARY and in BOTH languages —
-// see the row's own comment for where each number comes from.
+// The one-line row's column widths at the DEFAULT text size, mirroring the Tailwind classes the
+// boxes actually use. They have to be mirrored by hand — Tailwind can't take a runtime value, and
+// the classes have to stay, because they're rem: Settings' text-size slider drives the root font
+// (`html { font-size: calc(16px * var(--font-scale)) }`, 0.9–1.3), so the boxes must grow with
+// their contents. Inline pixels froze them and a channel name at 130% wanted 152px in a 128px box.
+// Keep this table and the classes in step; each number is measured against the worst case in the
+// LIBRARY and in BOTH languages — see the row's own comment for where each comes from.
 const ROW_COL = {
-  actions: 192, //   six buttons at 28 + five 4px gaps = 188
-  channel: 128,
-  meta: 104, //      RowMetaCells' own grid: 4rem + 1rem + 1rem + two 4px gaps
-  views: 64,
-  published: 192,
+  actions: 192, // w-48 — six buttons at 28 + five 4px gaps = 188
+  channel: 128, // w-32
+  meta: 104, //   RowMetaCells' own grid: 4rem + 1rem + 1rem + two 4px gaps
+  views: 64, //   w-16
+  published: 192, // w-48
 } as const;
 const ROW_GAP = 12; // gap-3
 const ROW_PAD = 26; // px-3 both sides, plus a rounding allowance
 const ROW_TITLE_MIN = 120; // not a column: the floor below which a title isn't worth showing
 
 // What the row must measure before each column earns its place — cumulative, so each appears only
-// once everything to its left AND a readable title already fit.
+// once everything to its left AND a readable title already fit. Calibrated at the default text
+// size; at 130% the columns grow ~30% while these don't, so they read slightly eager — the title
+// gets tighter there, but it can't vanish, since the last column standing down frees ~200px.
 const ROW_BASE = ROW_PAD + ROW_COL.actions + ROW_GAP + ROW_TITLE_MIN;
 const ROW_FITS = {
   channel: ROW_BASE + ROW_GAP + ROW_COL.channel,
@@ -496,9 +500,7 @@ function VideoCard({
         <div className={clsx(rowShell, "flex items-center gap-3 px-3 py-2", watched && "opacity-55")}>
           {/* Actions lead: this is where the eye already is (the title is the thing you read), so
               they're the shortest pointer trip from it. */}
-          <div className="shrink-0" style={{ width: ROW_COL.actions }}>
-            {actions}
-          </div>
+          <div className="shrink-0 w-48">{actions}</div>
           {/* Everything else is shrink-0, so the title is the only thing that can give — which means
               once the fixed columns outgrow the row, it gives ALL of it and vanishes. Columns drop
               from the right as the row narrows, least important first: a title with no date beats a
@@ -506,30 +508,18 @@ function VideoCard({
               filter panel are doing. Until the first measure lands (width 0) show everything: the
               row is off-screen for that frame anyway, and guessing narrow would flash. */}
           <div className="min-w-0 flex-1">{title}</div>
-          {fits(ROW_FITS.channel) && (
-            <div className="shrink-0" style={{ width: ROW_COL.channel }}>
-              {channelButton}
-            </div>
-          )}
+          {fits(ROW_FITS.channel) && <div className="shrink-0 w-32">{channelButton}</div>}
           {fits(ROW_FITS.meta) && <RowMetaCells video={video} />}
           {/* Right-aligned like the duration: it's a number, so the digits share an edge. 64px
               holds the widest bare form ("101.7K" at 48) in either language — dropping the word
               took this from 144 and handed the difference to the title. */}
           {fits(ROW_FITS.views) && (
-            <div
-              className="shrink-0 text-sm text-muted text-right tabular-nums truncate"
-              style={{ width: ROW_COL.views }}
-            >
+            <div className="shrink-0 w-16 text-sm text-muted text-right tabular-nums truncate">
               {viewsCell(false)}
             </div>
           )}
           {fits(ROW_FITS.published) && (
-            <div
-              className="shrink-0 text-sm text-muted truncate"
-              style={{ width: ROW_COL.published }}
-            >
-              {published}
-            </div>
+            <div className="shrink-0 w-48 text-sm text-muted truncate">{published}</div>
           )}
           {/* Thumb draws this over the image; with no image it goes on the row itself. */}
           {pct > 0 && (