Fix yield divisors and cold-cache UX in macro tab

All four treasury yield symbols return values already in percent;
the old /10 and /100 divisors were displaying ~0.04–0.46% instead
of the correct 3–5% range. Also rename ambiguous `l` variable and
add a spinner for the cold-cache load.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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