[BHP1-1611] Shade result tables per direction

[rjsheperd]

Purpose

• Shade each direction's outputs independently — a filter range no longer strikes Backing/Flanking cells against the Heading scale.
• Extract the range math into a pure behave.results.shading core and a single :worksheet/shade-set sub, replacing the logic duplicated across the matrix / results tables.
• Parameterize shading by output scope to shade one direction at a time.
• Round comparisons to the result-table formatter's significant digits, to make values and shading filters agree.

Related Issues

Closes BHP1-1611

Submission Checklist

• Included Jira issue in the PR title (e.g. BHP1-### <title>)
• Code passes linter rules (clj-kondo --lint components/**/src bases/**/src projects/**/src)
• Feature(s) work when compiled (clojure -M:compile-cljs)

Testing

1. Open a worksheet with a directional output (e.g. Surface rate of spread) and multiple directions enabled (Heading, Backing, Flanking).
2. Enable a table shading filter with that fits Heading Rate of Spread' values.
3. Confirm only out-of-range cells within each direction are shaded — Backing and Flanking shade against their own values, not the Heading range.
4. Switch between the matrix views (1, 2, and 3 multi-valued inputs) and the flat results table; shading stays consistent and the flat table matches the Heading matrix.
5. Toggle the filter off and confirm shading clears everywhere.
6. Run CLJS tests: shading_test.cljs, `results_table_test.cljs~, worksheet_subs_test.cljs.

[Kcheung42]

Looks good! great work! Thanks for the tests