achannarasappa / ticker / 27910707964

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Feat/minor currency support (#372)

* fix: differentiate minor currencies (GBp) from major (GBP)

Yahoo Finance denominates some securities in a currency's minor unit
(e.g. GBp/pence) rather than its major unit (GBP/pounds). Ticker
previously uppercased the currency code, collapsing GBp into GBP and
treating pence-denominated prices as pounds, inflating Value, Cost, and
Change figures by 100x.

Preserve the case of the Yahoo currency code so GBp survives, and
synthesize a minor-currency conversion rate by scaling the major rate by
10^-n (n = minor unit). The Yahoo pair API force-uppercases symbols, so
the pence rate is derived from the major rate rather than fetched.

Also validate that the configured display currency is a blank or 3-char
uppercase ISO 4217 major code.

Fixes #282

* build: upgrade to go 1.26.4 to resolve stdlib vulnerabilities

govulncheck flagged four Go standard library vulnerabilities affecting
the codebase (GO-2026-5039, GO-2026-5037, GO-2026-4971, GO-2026-4918),
fixed in go 1.26.3/1.26.4. Bump the go directive and pinned CI Go
versions to 1.26.4.

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