fix(spot): spot the references worth chasing, not the derived ones

The comment came out "SSB WAC EU WAZ 15 WPX HA5" — the QSO's materialised
award_refs hold both kinds, and I took them all. Those four are what every
reader of the spot derives from the callsign in their head. They spent the
whole 30-character comment saying nothing and buried SOTA HA/KM-018, the one
reference anyone would have acted on.

Computed awards are now filtered out with the same rule the QSO editor uses
(isComputedAwardField), which is why they are the ones it lists on the left
and not in its read-only panel. The field map moves from a ref to state as
well: a ref left the first spot of a session computing before GetAwardDefs
had answered.

Also opens 0.25.2, since 0.25.1 shipped before the spot work, and sets the
default mode list to SSB, CW, FT8, FT4, FT2, RTTY, PSK31, FM. AM and
DIGITALVOICE stay in the catalogue but are no longer selected on a fresh
install. FT2 joins the digital family everywhere its siblings are listed —
report list, RST defaults, Flex power class — so it gets dB reports rather
than the 59 an unknown mode falls back to.

frontend/src/components/SettingsModal.tsx

@@ -109,6 +109,7 @@ const MODE_CATALOG: Array<{ name: string; sent: string; rcvd: string }> = [
   { name: 'DIGITALVOICE', sent: '59',  rcvd: '59'  },
   { name: 'FT8',          sent: '-10', rcvd: '-10' },
   { name: 'FT4',          sent: '-10', rcvd: '-10' },
+  { name: 'FT2',          sent: '-10', rcvd: '-10' },
   { name: 'JS8',          sent: '-10', rcvd: '-10' },
   { name: 'MSK144',       sent: '+00', rcvd: '+00' },
   { name: 'JT65',         sent: '-15', rcvd: '-15' },