Add context-aware rendering for function call debug contexts
in the bytecode disassembly view. Instructions with invoke,
return, or revert contexts now show colored badges and inline
labels instead of the generic info icon, with colored left
borders to make call boundaries visually scannable.

- Add classifyContext/summarizeContext utils for extracting
  human-readable info from debug context objects
- Replace generic info icon with arrow/return/x badges for
  invoke/return/revert instructions
- Show inline context labels (e.g. "invoke add", "return add")
- Add structured tooltip headers before raw JSON
- CSS for context badges, labels, and row highlighting