vignettes: tighten prose, drop redundant figures, fold tmax/tmin + annual snow into faceted panels

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Summary

Tighten both regional vignettes (kootenay-lake, peace-fwcp) in parallel: plainer language for new readers, fewer redundant figures, tighter prose.

Plain-language reworks

• "Snowpack is the hinge of BC hydrology" → mechanism-first opener: "In BC, most of the year's runoff starts as winter snow. The snowpack stores it, then releases it as meltwater across spring and summer."
• Trends section preamble: define "anomaly" up front, name the two trend windows in plain English.
• Recent Decade vs Pre-Warming preamble: two-p-value explanation tightened; intro and p-value discussion split for readability.
• Daytime Highs preamble: drop "three figures below" lead-in (now one figure).
• Snow background bias notes: 4 paragraphs of methods → 1 paragraph that says the model misses absolute mm but trends are credible.
• Annual snowpack signals intro: 4-metric literature scaffolding → 3-bullet plain-language list (Peak SWE, DOY-50, snowfall fraction).
• Interpretation closer (salmonid framing): single tightened paragraph leading with the citations, then three bold knock-on effects.

Figure cuts and amalgamations

• Cut plot-tmean — the per-ecoregion facet-tmean covers it.
• Combine plot-tmax + plot-tmin → one 2-panel faceted plot-tmaxmin chunk.
• Cut plot-dtr — asymmetry numbers already in prose.
• Cut snow-rate-peak — not load-bearing in narrative.
• Combine snow-swe-max + snow-doy-50 + snow-fraction → one 3-panel faceted snow-annual chunk with scales = "free_y".

Net change per vignette: −5 standalone figure chunks, +2 faceted chunks → 3 fewer figures, same coverage.

Bibliography

• Drop kouki_etal2023Evaluationsnow (Northern-Hemisphere cell-mean bias background, no longer cited).
• Drop yue_wang2002Applicabilityprewhitening (Mann-Kendall pre-whitening methods note, no longer cited).
• 17 → 15 entries; bib union matches used keys exactly.

Test plan

• Both vignettes parse via knitr::purl() + parse().
• Both vignettes render cleanly via rmarkdown::render() with devtools::load_all().
• New faceted figures inspected visually: strip titles, axis labels (incl. ° degree symbol), legend ("Trend window — 1951-2025 / 1981-2025"), and free y-scales all read clean.
• Bib union matches used citation keys exactly (15/15).
• pkgdown CI builds clean on merge.

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