feat(layout): widen current pane to 50% — PANE_RATIO 2:5:3

Change the parent|current|preview split from 1:2:2 (20/40/40) to
2:5:3 (20/50/30) so the focused list gets more room. 2-pane tabs
now give current the combined 80%. Updates ratio comments and the
PaneRow test expectations.

src/components/PaneRow.tsx

@@ -1,15 +1,15 @@
 /**
  * PaneRow — the shared parent | current | preview 3-pane layout primitive.
  *
- * Implements yazi's `mgr.ratio = [1, 2, 2]` contract: three columns grow at
- * 1/5 : 2/5 : 2/5 of the row width via Yoga `flexGrow`, so every list tab
- * renders an identical, layout-stable shell. Columns use `flexBasis={0}` so
- * the ratio is exact regardless of content width — a column's content can
- * never stretch its slot.
+ * Implements yazi's `mgr.ratio` contract: three columns grow at
+ * 20% : 50% : 30% (PANE_RATIO 2:5:3) of the row width via Yoga `flexGrow`,
+ * so every list tab renders an identical, layout-stable shell. Columns use
+ * `flexBasis={0}` so the ratio is exact regardless of content width — a
+ * column's content can never stretch its slot.
  *
  * Column semantics (per the yazi depth model):
  *   parent  — the previous-depth list. Renders a muted `—` placeholder and
- *             KEEPS its 1/5 slot when blank (never collapses to width 0).
+ *             KEEPS its 20% slot when blank (never collapses to width 0).
  *             Borderless (no left/right/top/bottom edge). Carries the single
  *             header row: the CURRENT column's title renders top-left in the
  *             parent's slot (the panes above current/preview were removed).
@@ -184,7 +184,7 @@ export function PaneRow(props: PaneRowProps) {
 
 	return (
 		<box flexDirection="row" flexGrow={1} width="100%" height="100%">
-			{/* ── parent (1/5) — previous-depth list; title row top-left ───────── */}
+			{/* ── parent (20%) — previous-depth list; title row top-left ────────── */}
 			<Pane
 				grow={PANE_RATIO.parent}
 				label={currentLabel}
@@ -200,7 +200,7 @@ export function PaneRow(props: PaneRowProps) {
 				border={["left", "right"]}
 				scrollFocused={() => focused()}
 			/>
-			{/* ── preview (2/5) — hovered-item detail; no border, no header ────── */}
+			{/* ── preview (30%) — hovered-item detail; no border, no header ────── */}
 			<Show when={panes() === 3}>
 				<Pane
 					grow={PANE_RATIO.preview}

src/context/navigation-store.ts

@@ -13,7 +13,7 @@
  *
  *        parent  |  current  |  preview
  *
- * Layout ratios (1/5 : 2/5 : 2/5 in the final remake) live in
+ * Layout ratios (20% : 50% : 30% — PANE_RATIO 2:5:3) live in
  * `@/utils/navigation` (PANE_RATIO). This module owns only the *focusable*
  * nav model — which column is focused and where its list cursor lives. The
  * parent/preview columns are always derived, never focused.

src/utils/navigation.ts

@@ -57,13 +57,13 @@ export function rootFrameFor(
 // terminal size — more robust than fixed percentages and exactly mirrors
 // yazi's `mgr.ratio` config. Set a slot's ratio to 0 to hide it (2-pane tabs).
 //
-// Current ratios: parent : current : preview = 1 : 2 : 2, i.e. 1/5 : 2/5 : 2/5
-// (20% / 40% / 40% of the row width). 2-pane tabs drop the preview slot and
-// give `current` the combined 4/5.
+// Current ratios: parent : current : preview = 2 : 5 : 3, i.e. 20% / 50% / 30%
+// of the row width (2 : 5 : 3 of 10). 2-pane tabs drop the preview slot and
+// give `current` the combined 8/10 (80%).
 export const PANE_RATIO = {
-	parent: 1,
-	current: 2,
-	preview: 2,
+	parent: 2,
+	current: 5,
+	preview: 3,
 } as const;
 
 // Number of *focusable* content panes per tab. The three visible columns