fix(docs): resolves nested variables fully when show vars is on(4247)

[adwait-bruno]

REF:BRU-4247

On the Collection Docs Overview, a collection variable that points at another variable only resolved one level deep when Show vars was on. Hovering the same variable with Show vars off resolved it all the way The hover card goes through resolveValueDeep, which repeats substitution until nothing changes. Show vars went through resolveVariables, a single String.replace pass — and replace never re-scans the text it just inserted, so it stopped after the first hop.

Fix

Both call sites in useVariableResolver.tsx now use the looping resolver