[daggerok]

What changed

Same port as Neos daggerok/Neos#71 (shared blocks watchlist-key.tsx, closed-badge.tsx, closed.css, ported with securities.ts of workspace ui-std):

• Watchlist rows merge by security: CUSIP, ISIN, FIGI or SEDOL (recognized by format and check digit, whatever column holds them; a US or Canadian ISIN also gives its CUSIP), else by ticker and name. A ticker alone never merges anything
• Ticker and name join one security published with different identifier kinds only when none of the groups with that ticker and name disagree on a CUSIP, ISIN or SEDOL; debt rows (bond asset class, coupon or maturity) never meet the issuer stock
• The Ticker column still shows the ticker; Copy Tickers copies each real ticker once, never a CUSIP or name stand-in
• Closed funds (status: closed, closedDate, closedSource in index.json) keep their row with a Closed <date> badge that links the closing notice; the Fund Name filter (closed, !closed) and the search find them
• The page loader reads holdings published as header+array rows too, not only objects

Why

ETF-C3: different securities with one ticker became one Watchlist row (ACA of Arcosa and Credit Agricole before the ticker fix, T on Treasuries and AT&T). Q21: closed funds were not visible as closed

How it was checked

• bun test: 45 pass, 0 fail
• bun run build, bun build --target=bun src/main.tsx --outfile=/dev/null, git diff --check
• tc/check.sh: 48 lines, same as on main, nothing new
• Browser (headless, silent) on dist: brand-uitest-spdr.ts 44 passed, columns-uitest.ts 19, categories-uitest.ts 19, clear-uitest.ts 19, security-uitest.ts 20, all 0 failed; console errors: none