[yeled]

Summary

• Adds a Rolling Slots setting (rolling_mode custom field / --rolling CLI flag): instead of fixed clock times, the first slot anchors to the current hour and steps forward by 2h on every refresh, so the forecast always shows what's coming up next.
• 1-day range: one continuous 16h rolling window (8 slots). If it spans midnight, the trailing slots stay in the same block rather than splitting into a separate "Tomorrow" section.
• 2-day range: only today rolls (stopping at midnight). Tomorrow isn't a rolling continuation — that would land it on whatever odd hours the rollover happens to hit — so it always shows a fixed 6am/10am/2pm/6pm spread instead.
• Wired through trmnl_report.py (--rolling), weather.cgi (?rolling=1), and the plugin's polling_url/custom fields in src/settings.yml.

Bleed fix surfaced by this work

Rolling mode can produce a day-block with 2 rows of cells alongside a sibling with just 1 row. The templates previously gave every .wc-day an equal flex:1 share regardless of content, so a 2-row block would overflow into its sibling (overlapping text/headers). Fixed by:

• Computing each day's row count server-side (d.rows) and sizing blocks proportionally via a data-rows attribute + CSS in full.liquid, half_vertical.liquid, half_horizontal.liquid.
• Tightening half_vertical's icon size/padding, which was still clipping its bottom row even after the proportional fix (not enough total height for current-weather panel + a 2-row day + a 1-row day).

Test plan

• Verified rolling math directly: correct anchor/window computation, correct midnight-crossing grouping, correct rows-per-day.
• Verified through both --rolling CLI flag and weather.cgi?rolling=1 query param.
• Rendered all 4 layouts (full, half_vertical, half_horizontal, quadrant) for: fixed mode (regression), 1-day rolling with midnight spillover, and 2-day rolling — all clean, no overlap or clipping.
• Confirmed fixed (non-rolling) mode payloads are unchanged.

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