Trim input helper aria-describedby whitespace

[jasperan]

Summary

Fixes #59 by trimming the aria-describedby value after appending input helper ids.

Problem

ojinputtext could leave leading or trailing whitespace in aria-describedby while appending helper ids. The issue report tied that malformed attribute value to jQuery validation failures after repeated date interactions.

Reproduction

Trigger the _AppendInputHelper() path on ojInputText and inspect the resulting aria-describedby value.

On the unfixed build, the helper path could produce " helper-id" instead of "helper-id".

Changes

• trim the concatenated aria-describedby string before writing it back
• apply the change in the debug, debug_esm, and minified bundles

Verification

• reproduced the helper path in a jsdom-backed local check and confirmed the resulting attribute is now helper-id
• confirmed package smoke still passes with npm pack --dry-run

Scope / Caveats

• this patch normalizes helper-id whitespace only
• it does not attempt to deduplicate repeated helper ids