fix(crown): anchor grid head on scoring watermark + 1h window

[anderdc]

Problem

On the Crown History grid, the striped pending cell would sometimes strand on an interior block — sitting next to already-finalized blue cells — and stay stale across refreshes.

Root cause

The grid is drawn entirely from crown_holders, which the validator now writes directly up through crown_holders_max_block (#390 in allways). But the grid anchored its head — window snap, the "AS OF #…" label, and the pending-cell marker — on halt.asOfBlock, i.e. MAX(block_number) FROM contract_events (the event-indexer head).

Those two heads advance on independent pipelines. contract_events only ticks on commitments/swaps, while the validator keeps scoring every block. On a quiet network the crown watermark runs ahead of asOfBlock, so isCurrent = b === asOfBlock lands the stripe on a block that's already finalized (blue cells exist past it), and it doesn't move until a new on-chain event bumps asOfBlock.

Fix

Anchor the head on the crown data's own watermark via useScoringState().lastScoredBlock (= crown_holders_max_block), +1 for the live tip. The pending cell now always sits exactly one block past the last finalized data — it can never strand among finalized cells.

Also: 1h scoring cadence (300 blocks)

The validator's SCORING_WINDOW_BLOCKS is now 300 (~1h), not 600. Mirrored here:

• SCORING_WINDOW_BLOCKS 600 → 300; RANGE_BLOCKS rebased on it (chips stay honest: 1h=300, 2h=600, 4h=1200)
• the "scoring window" snap/label/window-pan behavior moved from the 2h chip to the 1h chip (one round = 300 blocks)
• default crown range 2h → 1h (both pages); detail-page crownPan default 600 → 300
• ScoreFactorsStrip copy "2-hour" → "1-hour"

Docs counterpart: entrius/allways-docs-ui#51.

Notes / to confirm

• Custom-range cap mirrors SCORING_WINDOW_BLOCKS, so the max custom window is now 300 blocks (was 600). Faithful to the prior "caps at one scoring window" intent — flag if it should be decoupled.
• The "AS OF #" counter + pending cell now advance in ~1h steps (one per scoring round) rather than ticking on every contract event — correct, since the marker and the grid data now share one clock. The live /crown widget still updates every forward step.

tsc -b and eslint pass.