fix(design): clamp the gauge once so needle and readout agree

The needle angle clamped to 0-100 while the readout rendered the raw value, so a gauge fed 150 pinned the needle at +60 degrees under a "150%" label. A shared gallery-widget--clamp-value now feeds both halves.

Two hygiene fixes ride along. The module requires cl-lib explicitly instead of leaning on svg.el's transitive require. The token-file load resolves its directory through gallery-widget--source-dir, which falls back to default-directory when the form is re-evaluated outside a load and outside a file buffer (both location variables are nil there and file-name-directory errored).

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