fix: inline editor arrow key interactions (edit & enter states)

[AyushAgrawal-A2]

closes #1961

Mode indicator: (for testing, will change) Insert Cell Ref Mode: White Icon

Navigate Text Mode: Black Icon

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Name	Status	Preview	Updated (UTC)
quadratic	❌ Failed (Inspect)		Nov 21, 2024 5:05pm

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.82%. Comparing base (51156b2) to head (5378d8b). Report is 43 commits behind head on qa.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## qa #1972 +/- ## ========================================== - Coverage 93.06% 90.82% -2.24% ========================================== Files 215 260 +45 Lines 54353 57549 +3196 ========================================== + Hits 50581 52271 +1690 - Misses 3772 5278 +1506 ```

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[AyushAgrawal-A2]

Can we provide some spacing/padding around the icon? For example, this this screenshot, the icon size is 15x15px (instead of 20x20). Gives it a little more space to breathe.

@jimniels done