Fix for modals not reacting to the Esc key & for file input field not gaining focus

[Oaphi]

closes #1611

2 fixes:

• modals now react to the Esc key being presses as expected (they should close);
• file input field is now focused when the image upload modal is opened;

ssr-2025-08-09_00.11.13.mp4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.78%. Comparing base (2ae9944) to head (cdde07b).
⚠️ Report is 22 commits behind head on develop.

Additional details and impacted files

Components	Coverage Δ
controllers	69.86% <ø> (ø)
helpers	81.82% <ø> (ø)
jobs	60.00% <ø> (ø)
models	86.12% <ø> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[cellio]

On a post draft, I tested the image and link buttons. The image file has focus (so you don't need the mouse), and escape closes both modals. If you didn't mean to close a link modal, I see that your previous typing is still there if you choose it again, and only on that post (other posts start fresh) -- all expected behavior.

I'm not sure what other modals are affected. I didn't observe any differences with close or flag operations. I suppose "modal" means "thing that seems to pop over your screen and take control"? I can't think of others of those off hand; happy to test if someone reminds me where.