chore: record journal

.trellis/workspace/hechang27-sprt/index.md

@@ -8,8 +8,8 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 14
+- **Total Sessions**: 15
-- **Last Active**: 2026-04-02
+- **Last Active**: 2026-04-03
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@@ -19,7 +19,7 @@
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 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~587 | Active |
+| `journal-1.md` | ~659 | Active |
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@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits |
 |---|------|-------|---------|
+| 15 | 2026-04-03 | Rebuild list-table-v2: Scaffold hooks and types | `0f72b83`, `87000d8` |
 | 14 | 2026-04-02 | Fix list-table-v2 fixed column cropping and horizontal scroll | - |
 | 13 | 2026-04-02 | Attempt Pretext row height estimation for el-table-v2 | stashed |
 | 12 | 2026-04-02 | Pretext integration exploration - virtual table issues | `0764ee2` |

.trellis/workspace/hechang27-sprt/journal-1.md

@@ -585,3 +585,75 @@ Fixed list-table-v2 issues:
 ### Next Steps
 
 - None - task complete
+
+
+## Session 15: Rebuild list-table-v2: Scaffold hooks and types
+
+**Date**: 2026-04-03
+**Task**: Rebuild list-table-v2: Scaffold hooks and types
+
+### Summary
+
+Scaffolded list-table-v2 hooks for pretext-based virtualized table. PR1 complete: hooks + types created.
+
+### Main Changes
+
+## What was done
+
+**Research**: Explored pretext-table (ShipItAndPray) and virtual-table (aimerthyr) implementations. pretext-table uses custom prefix-sum virtualizer + pretext text measurement (no TanStack Virtual).
+
+**PRD Created**: Full requirements documented:
+- Custom prefix-sum virtualizer (pretext-table style, lightweight)
+- @chenglou/pretext for text measurement
+- Variance-based flexGrow/flexShrink from sampled data
+- Runtime augmentation for custom cellRenderers
+- Cell renderers return plain VNode or {vnode, minHeight, minWidth}
+
+## PR1: Scaffold ✅ COMPLETE
+
+```
+packages/base/data/list-table-v2/
+├── index.ts                      # Exports all hooks and types
+├── types.ts                      # ListTableColumn<T>, ListTableProps, etc.
+├── measureText.ts                # Cached pretext measurement
+├── usePretextColumnWidths.ts    # Variance-based flex params
+├── usePretextRowHeights.ts       # Pre-computed row heights
+├── useVirtualRows.ts            # Prefix-sum + binary search virtualizer
+└── useRuntimeHeightAugment.ts # ResizeObserver + running average
+```
+
+## Key Design Decisions
+
+1. **prepareWithSegments() caching**: Using prepareWithSegments for everything since it's the superset type that works with both layout() and walkLineRanges(). Cache is LRU-capped at 10,000 entries.
+
+2. **walkLineRanges for shrink-wrap**: Using walkLineRanges with large maxWidth to find widest line — handles embedded \n correctly and avoids binary search.
+
+3. **Variance formula**: varianceScore = min(1, σ / (μ * 0.5)); flexGrow/flexShrink = 0.1 + varianceScore * 1.9
+
+## Remaining PRs
+
+| PR | Goal |
+|----|------|
+| PR2 | Wire hooks into Vue component, flex container, virtual scrolling |
+| PR3 | cellRenderer {vnode, minHeight} return type, ResizeObserver augmentation |
+| PR4 | Fixed columns, pagination, slots, polish |
+
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `0f72b83` | (see git log) |
+| `87000d8` | (see git log) |
+
+### Testing
+
+- [OK] (Add test results)
+
+### Status
+
+[OK] **Completed**
+
+### Next Steps
+
+- None - task complete