Whitelist: replace "in superblock" count with project-by-project "active" count

[jamescowens]

Summary

• The summary header reads Whitelisted Projects: N (M in superblock), where M is sb.total_projects straight from the superblock contract. That count includes manually-greylisted projects whose scraper-converged stats still landed in the superblock with Mag=0, so the headline overstates how many projects are actually earning rewards. On the live data today the cell reads 16 (15 in superblock) while only 11 projects are accruing.
• Replace the parenthetical with a project-by-project active count → 16 (11 active).
• The new count filters on projectStatus(p).cssClass === "status-active", which already maps both "Active" (with in_superblock=true) and "Active by Greylist Override" to status-active, and routes "Active" + in_superblock=false to status-excluded. So one filter pass picks up exactly the active-and-in-superblock projects.

Why it can't just be in_superblock − greylisted − excluded

The greylisted set and the excluded-by-scrapers set overlap. A manually-greylisted project whose stats host is also unreachable (e.g. SiDock@home on mainnet today — site hard-down, picked up by convergencereport's excluded_projects) is both greylisted and excluded by scrapers. Set arithmetic on the aggregate counts double-counts that project; the only correct computation is project-by-project.

Test plan

• Local preview at http://jco-linux.jcowens.net:81/whitelist.htm shows Whitelisted Projects 16 (11 active) on current mainnet data (11 Active by Greylist Override, 4 manually-greylisted-but-in-superblock, 1 manually-greylisted-and-unreachable).
• Greylisted-row badges still red, excluded-row badges still yellow, active-row badges still green (no regression from Whitelist: color and sort "Active by Greylist Override" as active #451).
• Spot-check after merge that the live site headline matches the table contents.

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