chore(task): archive 04-08-fix-table-v2-flex-columns

.trellis/tasks/archive/2026-04/04-08-fix-table-v2-flex-columns/check.jsonl

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+{"file": ".claude/commands/trellis/finish-work.md", "reason": "Finish work checklist"}
+{"file": ".claude/commands/trellis/check.md", "reason": "Code quality check spec"}
+{"file": ".trellis/spec/packages-base/index.md", "reason": "Review package-level export conventions for ListTableV2 changes."}
+{"file": ".trellis/spec/frontend/component-guidelines.md", "reason": "Verify column flex behavior still matches table-v2 guidance."}
+{"file": ".trellis/spec/frontend/quality-guidelines.md", "reason": "Run the expected package build/lint checks for the fix."}
+{"file": ".trellis/spec/guides/code-reuse-thinking-guide.md", "reason": "Confirm no duplicate width logic was introduced."}

.trellis/tasks/archive/2026-04/04-08-fix-table-v2-flex-columns/debug.jsonl

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+{"file": ".claude/commands/trellis/check.md", "reason": "Code quality check spec"}

.trellis/tasks/archive/2026-04/04-08-fix-table-v2-flex-columns/implement.jsonl

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+{"file": ".trellis/workflow.md", "reason": "Project workflow and conventions"}
+{"file": ".trellis/spec/frontend/index.md", "reason": "Frontend development guide"}
+{"file": ".trellis/spec/packages-base/index.md", "reason": "Base component export and package conventions for ListTableV2."}
+{"file": ".trellis/spec/frontend/quality-guidelines.md", "reason": "Build/test expectations for package changes and example verification."}
+{"file": ".trellis/spec/frontend/component-guidelines.md", "reason": "Element Plus table-v2 and column flex distribution guidance."}
+{"file": ".trellis/spec/guides/code-reuse-thinking-guide.md", "reason": "Reuse existing column width logic instead of adding a parallel mechanism."}

.trellis/tasks/archive/2026-04/04-08-fix-table-v2-flex-columns/observations.md

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+# Observations
+
+## Exported Component Path
+
+- The live `ListTableV2` used by the examples page is exported from [packages/base/index.ts](../../../../packages/base/index.ts) via `./data/list-table-v2/list-table-v2.vue`.
+- Earlier styling work had touched a different file, `packages/base/data/list-table-v2.vue`, which is not the component currently exported to the examples app.
+
+## Section 8 Fixed Row Height Behavior
+
+- Section 8 of the demo page uses plain columns without explicit widths.
+- In the exported component, fixed row height mode had not originally changed the width path directly, but row-height handling and width/render behavior were easy to confuse because the exported implementation diverged from the older wrapper file.
+
+## Wrapping Logic
+
+- There is no explicit semantic classifier for “wrappable” vs “unwrappable” values.
+- For normal body cells, width estimation uses shrink-wrap text measurement, which is effectively an unwrapped width preference.
+- For normal body cells, row-height estimation uses wrapped text measurement at the current column width.
+- Rendered body cells are wrappable by default through CSS:
+  - `white-space: normal`
+  - `word-break: break-word`
+- Header text is explicitly non-wrapping through CSS:
+  - `white-space: nowrap`
+- Custom renderer / slot cells are not text-measured with pretext; they use fallback height behavior instead.
+
+## Minimum Width Logic
+
+- If a column has explicit `width`, runtime style sets:
+  - `width = explicitWidth`
+  - `minWidth = explicitWidth`
+  - `maxWidth = explicitWidth`
+- If a column has explicit `minWidth`, that value becomes the computed `minWidth`.
+- Otherwise, automatic `minWidth` is derived from measured text statistics:
+  - measure shrink-wrap width of header text
+  - measure shrink-wrap width of sampled cell text
+  - compute `mean` and `variance`
+  - set `minWidth = max(mean - 2 * sqrt(variance), MIN_BASE_WIDTH) + CELL_PADDING`
+- This means auto `minWidth` is a statistical lower bound, not the width of the longest value.
+- If computed config is unavailable, the runtime fallback path uses `col.minWidth ?? 120` with a floor of `50px`.
+
+## Timestamp Width Bug Root Cause
+
+- Timestamp columns were rendered using formatted values, but width estimation had been measuring raw values.
+- Example:
+  - rendered timestamp looked like `2026-04-08 12:34:56`
+  - width estimation measured the raw Unix value like `1712579696`
+- This mismatch caused timestamp columns to be under-sized relative to their actual displayed content.
+- The discrepancy between section 1 and section 4 timestamp-related widths came from the width hook deriving stats from sampled measured values, combined with the mismatch between raw and formatted text.
+
+## Fix Applied During This Session
+
+- `usePretextColumnWidths` now accepts `formatCellValue` so width estimation uses the same displayed text as the rendered cell.
+- The exported `ListTableV2` passes its `formatCellValue` implementation into the width hook.
+- Scoped lint passed on the touched table-v2 files after this change.

.trellis/tasks/archive/2026-04/04-08-fix-table-v2-flex-columns/prd.md

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+# Fix table-v2 default flex columns in fixed row height mode
+
+## Goal
+Ensure `ListTableV2` keeps default columns flex-sized in fixed row height mode so columns expand to fill available width unless an explicit fixed width is configured.
+
+## Requirements
+- Preserve default flex sizing for non-fixed columns with no explicit `width`.
+- Do not let fixed row height mode remove or bypass the flex sizing contract.
+- Keep explicit column widths authoritative when a width is configured.
+- Verify the section 8 demo case reflects the expected cell/header flex behavior.
+
+## Acceptance Criteria
+- [ ] In section 8 of the demo page, default columns expose flex sizing behavior and fill remaining width.
+- [ ] Columns with explicit widths still use their fixed width behavior.
+- [ ] Fixed row height mode does not change default column sizing semantics.
+
+## Technical Notes
+- Primary component is expected to be under `packages/base/data/list-table-v2.vue`.
+- Check whether `el-table-v2` column construction and the cell/header CSS/render path diverge in fixed-height mode.
+- Reuse existing column width logic rather than introducing a parallel sizing mechanism.

.trellis/tasks/archive/2026-04/04-08-fix-table-v2-flex-columns/task.json

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+{
+  "id": "fix-table-v2-flex-columns",
+  "name": "fix-table-v2-flex-columns",
+  "title": "Fix table-v2 default flex columns in fixed row height mode",
+  "description": "",
+  "status": "completed",
+  "dev_type": "frontend",
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "hechang27-sprt",
+  "assignee": "hechang27-sprt",
+  "createdAt": "2026-04-08",
+  "completedAt": "2026-04-08",
+  "branch": null,
+  "base_branch": "dev",
+  "worktree_path": null,
+  "current_phase": 0,
+  "next_action": [
+    {
+      "phase": 1,
+      "action": "implement"
+    },
+    {
+      "phase": 2,
+      "action": "check"
+    },
+    {
+      "phase": 3,
+      "action": "finish"
+    },
+    {
+      "phase": 4,
+      "action": "create-pr"
+    }
+  ],
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}