Add autocomplete keymap

[shenawy29]

Demo:

2026-03-22.02-01-14.mp4

Changes:

This adds a new keymap in index.jsx and modifies contextAwareHinter.jsx to return all hints in a context aware manner. This simulates other editors like VSCode.

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines

[release-com]

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