fix: pin price column to right edge of row (v0.13.4)

Root cause: .ab-mp-price and .ab-mp-ctx were siblings in .ab-mp-row-meta
with price first. Description text is variable-length, so the meta div
grew/shrank per row, shifting the price left/right.

Fix:
- Move price to last child in .ab-mp-row-meta so its right edge is
  always pinned to the row's fixed right edge
- Add flex-shrink: 0 to .ab-mp-price so it never compresses
- Cap .ab-mp-ctx at max-width 200px with text-overflow: ellipsis
- Swap column header order (Context, then Price) to match new DOM order

assets/css/model-picker.css

@@ -142,7 +142,7 @@
 	color: var(--ab-text-muted, #64748b);
 	font-variant-numeric: tabular-nums;
 	white-space: nowrap;
-	min-width: 90px; text-align: right;
+	min-width: 90px; text-align: right; flex-shrink: 0;
 }
 
 .ab-mp-ctx {
@@ -151,6 +151,7 @@
 	background: var(--ab-bg, #f8fafc);
 	padding: 2px 6px; border-radius: 4px;
 	white-space: nowrap; min-width: 36px; text-align: center;
+	max-width: 200px; overflow: hidden; text-overflow: ellipsis;
 }
 
 /* ── Footer ─────────────────────────────────────────────────────────── */