Avoid rerendering suggested SSH host rows

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What Changed

• Replaced the per-row inline onConnect wrapper for discovered SSH hosts with the stable connect handler.
• Added an explicit memo comparator for DesktopSshHostRow so unchanged discovered host rows are compared by displayed target fields and connection state instead of relying only on object identity.

Why

React Doctor flagged DesktopSshHostRow as a memoized component receiving an inline function prop, which forced every suggested SSH host row to redraw on unrelated parent updates. React Scan confirmed the static suggested host rows rerendered on every Host/Alias keystroke in the Add Environment SSH dialog. Passing a stable handler and comparing row props by value lets these rows skip unrelated parent renders.

UI Changes

React Scan recordings captured during local validation:

• Before: connections_ssh_rows_react_scan_before.mp4 shows devbox/staging/builder rows flashing on each Host/Alias keystroke.
• After: connections_ssh_rows_react_scan_after.mp4 shows only parent/dialog containers flashing; individual suggested host rows no longer flash.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Validation:

• react-doctor --project @t3tools/web --category performance --verbose --json rerun: web performance diagnostics dropped from 134 to 133; warnings dropped from 61 to 60. Remaining failures are pre-existing unrelated diagnostics.
• vp check passed with existing warnings.
• vp run typecheck passed.

  

Note

Avoid rerendering DesktopSshHostRow when props are unchanged

Wraps DesktopSshHostRow in React.memo with a custom comparator (areDesktopSshHostRowPropsEqual) that skips re-renders unless connectingHostAlias, onConnect, or any of target.alias/hostname/username/port/source change. Also replaces the inline arrow function passed as onConnect with a stable handleConnectSshHost reference so the comparator can short-circuit on reference equality.

^{Macroscope summarized 0bab680.}