Add SoB + LFX selections, close /join with a two-futures band, and stop the desk from cloning its remit onto every hover card

[bhumindeshpande8-spec]

Wall is no longer GSoC-only

First non-GSoC entries in SELECTIONS: one Summer of Bitcoin row, one LFX row. Same
tuple shape and rules as the GSoC arrays.

Vivek Singh Solanki appears twice on purpose (GSoC + LFX) — the wall lists selections,
not people, and everything counting people dedupes by name. He's also a different
person from the "Vivek Singh" in SoB. Both noted in source.

Hardcoded "fifteen" removed from prose comments across CommunityBanner,
ContribWall, Hall, Terminal, club.ts — the count moves as names come in.
Comments only.

New ProgrammeInfo.ours

The "Who from SST has done it" row stays derived from SELECTIONS for selective
programmes — that's what keeps this page and the Hall of Fame in agreement. But GSSoC
and Hacktoberfest are participation programmes, so the honest answer is a count plus
whoever stood out, which no Selection row can express without inventing a selection.
Optional prose field, rendered above the derived names so neither can silently hide
the other.

/join closing band

Contrasts "if you close this tab" against "if you hit the button". Deliberately not a
NextAction — no link at all, because an exit under a half-filled form loses the
application. On the page rather than in ApplyForm, where it read as a third
disclaimer.

Desk hover cards

The desk was pushing its remit onto all four members, so four faces popped the same
paragraph. remit override prop removed with its only caller; the remit still appears
once in the stacked list below, where it's read aloud. That exposed a latent bug —
three of four members carry only a name, and an empty .person-tip renders as a small
dark rectangle on hover. Node now skips the bubble when there's nothing to say.

Review notes

• Person counts unchanged; check NumbersStrip dedupes with the duplicated name present.
• New entries have no proof url, same as all existing ones — still the open gap.
• text-* on .label is a no-op (declared after @tailwind utilities), so the band's
  asymmetry rides on body copy and the accent rule.