test: refresh card fixtures from live captures; fix(cli): empty Properties block for {}

[dsociative]

Why

The card fixtures were hand-trimmed subsets of July captures (9–39 of the ~90 keys a card carries; external_links absent everywhere) and had been enriched by hand with a child card, a file and a blocker that no longer existed on the test account. Tests could only prove that the models parse what we thought the API returns.

What

• card_get_full.json (both crates), mcp_card_full.json, card_get_no_properties.json, card_with_tags.json, card_with_checklists.json, cards_list.json (both crates) are now full live captures of the dstest fixture card 67089469 (GET /cards/{id}) and of GET /cards?space_id=810671, sanitized: emails → <user>@example.com, avatar data URLs → null, inbound email keys zeroed, share ids null.
• Hand overlays remain only for what the test tariff cannot produce — relations (children), blocking (blockers/blocked) and custom properties — plus the CLI two-item checklist and two-tag scenarios.
• The dstest fixture card is now frozen (permanent attachment probe-attach.txt = file 62769658, permanent external link); a separate card is the playground for mutating smoke tests.
• Test expectations follow the data: new attachment id/uuid, five real cards in the list (one title with an emoji and Cyrillic — the table copes), and a corrected assumption: list cards do carry members, tags and checklists (the old test asserted they don't).

Bug found by the realistic fixtures

Kaiten returns "properties": {} for a card without custom properties; card view printed an empty Properties: block with {} under it (reproduced live on dstest). The hand-made fixture said null and hid it. Fixed in the first commit (fix(cli): …), verified RED → GREEN in isolation; the MCP projection already treated {} as "none".

No public API change; fix → 0.5.1.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.70%. Comparing base (fc76f09) to head (27a562f).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   86.69%   86.70%           
=======================================
  Files          33       33           
  Lines        4894     4897    +3     
=======================================
+ Hits         4243     4246    +3     
  Misses        651      651           

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