feat(view): multi-select items and copy as a Markdown list (0.3.1)

[mabry1985]

Multi-select + Copy as Markdown

Select rows with the checkboxes (or select-all for the visible rows), then Copy as Markdown or ⌘C. One line per item:

- Reikland Reavers Human Team — Blood Bowl 2016 Split — $57.69
- Loose dice — —

Selection is kept by id across filters and tabs, so a list can span lots. Clipboard falls back to execCommand("copy") and then to a dialog with the text pre-selected when the iframe is denied clipboard access.

Node harness pins the format; 123 tests. Smoke-tested locally with a stubbed clipboard (button and shortcut paths).

🤖 Generated with Claude Code

https://claude.ai/code/session_011UQ33xXfygwEkzbbJx3YwZ

[protoreview]

QA panel review — WARN

code-review-structural · head ac542f4d728e · formal

Low-risk change overall. The single confirmed finding is a minor correctness issue: state.itemsById is populated in loadCore() but never pruned, so a server-side delete leaves a stale object that can leak into markdown output via selectedItems(). The verifier confirmed the finding and noted that .filter(Boolean) does not protect against this (the stale value is a truthy object, not undefined). No panel disagreement — the finding was flagged by both correctness and removed-behavior angles and confirmed on verification. No coverage gaps; the structural pass completed and the diff is small enough that one file carries the full risk surface.

Findings

	Severity	Location	Finding	Verified
🟡	minor	view.py:192	state.itemsById is only ever populated (add/update) and never pruned, so after an item is deleted from the server its stale object remains in the map and is in…	confirmed

findings JSON (machine-readable)

[
  {
    "file": "view.py",
    "line": 192,
    "severity": "minor",
    "category": "correctness",
    "claim": "state.itemsById is only ever populated (add/update) and never pruned, so after an item is deleted from the server its stale object remains in the map and is included in the Markdown copy if its ID is still in state.selected (flagged by both correctness and removed-behavior review).",
    "evidence": "for (const it of state.items) state.itemsById[it.id] = it;",
    "verdict": "confirmed",
    "note": "Verified in the full PR diff: itemsById is populated in loadCore() but never pruned (no delete/reset anywhere in the diff). selectedItems() uses .filter(Boolean) which does NOT protect against this \u2014 the stale entry is a truthy object, not undefined. Consequence (stale item in markdown) follows directly."
  }
]