Decode JSON Pointer segments and handle numeric path variants for Monaco highlighting

[DevROHIT11]

Motivation

• Improve locating and highlighting nodes in the Monaco editor when selectedNode.id is a JSON Pointer with percent-encoding or RFC6901 escapes (~1, ~0).
• Support ambiguous numeric path segments by trying both string and numeric interpretations so lookups work for both YAML and JSON parsed trees.
• Avoid runtime exceptions when path lookup fails and ensure decorations update when schema format/text changes.

Description

• Add decodePointerSegment to decode percent-encoded pointer segments and unescape ~1 and ~0 sequences.
• Introduce buildPathCandidates to produce candidate path arrays that include both string and numeric versions for numeric segments.
• Use the candidate paths to attempt locating nodes in YAML (parseDocument / getIn) and JSON (parseTree / findNodeAtLocation) and pick the first valid node with a range or offset for highlighting.
• Wrap lookup logic in a try/catch to prevent exceptions from breaking the effect and update effect dependencies to include schemaFormat and schemaText so highlights refresh on format/text changes.

Testing

• Ran the test suite with yarn test and all tests completed successfully.
• Ran the linter with yarn lint and no issues were reported.
• Verified that editor highlighting behavior updates when switching schemaFormat and when schemaText changes via automated test coverage and CI checks.

---

Codex Task