fix: escape propagation from RuiMenu and first-segment focus on an empty picker

[kelsos]

Two fixes found while wiring RuiDateTimePicker into an editor in rotki/rotki.

1. RuiMenu swallowed Escape even while closed

The root wrapper and the teleported popover both bound @keydown.esc.stop. withKeys only runs the handler for Escape, but when it did run, .stop fired regardless of whether the menu was open, so an ancestor listener never saw the key: not on the first press, not on any later one.

onLeave already calls stopPropagation itself, and only when the menu is open, so the fix is to pass it the event and drop .stop. Escape is swallowed while the menu is open (it closes the menu) and forwarded while it is closed.

Measured before the fix, with a keydown listener on an ancestor of the menu:

key	menu	ancestor saw it (before)	(after)
Escape	closed	no	yes
Escape	open	no	no
any other	open	yes	yes

2. Focusing an empty picker put the caret after the format tokens

An untouched field holds no value: the tokens are shown through the placeholder, and formattedDisplay only expands them into the value once the field is focused. That value write lands after handleFocus has run its setSelectionRange, and writing an input's value drops the selection, so the caret ended up at the end (position 16 of DD/MM/YYYY HH:mm) instead of on DD.

A filled field was never affected: it already selects the first segment (0-2). Now an empty one re-selects the first segment once the tokens are actually in the field, so both start in the same place.

Testing

• RuiMenu.spec.ts: escape forwarded while closed, swallowed while open, other keys always forwarded.
• RuiDateTimePicker.spec.ts: first segment highlighted on autofocus, for a filled and for an empty field. The empty-field test fails on main (expected 16 to be +0).
• Full suite: pnpm run test:run (1351 passing), pnpm run typecheck, pnpm run lint with no new warnings.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.05%. Comparing base (63521f3) to head (06a4375).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
+ Coverage   87.03%   87.05%   +0.02%     
==========================================
  Files         159      159              
  Lines        6307     6311       +4     
  Branches     1939     1940       +1     
==========================================
+ Hits         5489     5494       +5     
+ Misses        818      817       -1     

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