ui(precedents): citation action buttons icon-only

Drop the visible "העתק" / "ערוך" labels and keep just the icon —
matches the editorial/judicial restraint of the surrounding card.
Tooltip + aria-label preserve the affordance for hover and assistive
tech.

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

web-ui/src/app/precedents/[id]/page.tsx

@@ -313,10 +313,10 @@ function CitationBlock({
             type="button"
             onClick={onStartEdit}
             title="ערוך מראה מקום"
-            className="inline-flex items-center gap-1 rounded-md border border-rule bg-surface hover:bg-rule-soft/50 text-ink h-7 px-2 text-[0.72rem]"
+            aria-label="ערוך מראה מקום"
+            className="inline-flex items-center justify-center rounded-md border border-rule bg-surface hover:bg-rule-soft/50 text-ink-muted hover:text-navy h-7 w-7"
           >
             <Pencil className="w-3.5 h-3.5" />
-            ערוך
           </button>
         </div>
       </div>