feat: Make research log accessible from UI

[pmilano1]

Problem

The research log (search_attempts table) captures valuable information about what sources have been searched for each person, but this data is nearly invisible in the UI:

1. Research Queue page - Only shows a count (searchedCount) which isn't actionable
2. Sources column is noise - Showing recommended sources per row is redundant and clutters the view
3. No way to see search history - Users can't easily see what's already been tried
4. Person page - No research history visible at all

Current State

| Priority | Gap Type | Person | Location | Target | Sources (useless) | Searched (just a number) |

The previous_searches data exists in GraphQL but isn't surfaced meaningfully.

Proposed Solutions

1. Expandable Row Detail (Research Queue)

Click a row → expands to show search history inline

| ▶ | 85 | End of Line | John Smith (1850-1920) | Italy | Parents 1820-1850 |

↓ clicks ↓

| ▼ | 85 | End of Line | John Smith (1850-1920) | Italy | Parents 1820-1850 |
|   └─ Search History                                                        |
|      ✗ Antenati - NO_MATCH - "Searched Genoa 1820-1850" - Dec 25           |
|      ✗ FamilySearch - NO_MATCH - "No results for surname" - Dec 24         |
|      ⏳ WikiTree - not searched                                             |
|      ⏳ Geneanet - not searched                                             |
|      [+ Log Search Attempt]                                                 |

Benefits:

• See exactly what's been tried at a glance
• Know which sources remain to search
• Log new attempts without leaving the page

2. Replace Sources Column with Search Progress

Instead of listing source names, show actionable status:

Before (useless)	After (useful)
Antenati, FS, WT	2/5 searched with color indicator
or empty	🔴 Not started / 🟡 In progress / 🟢 Exhausted

3. Person Page: Research History Section

Add a collapsible section on the person page (maybe in ResearchPanel sidebar or main content):

📋 Research History
─────────────────────────────
Gap: Missing Parents
  • Antenati - No match (Dec 25, 2024)
    "Searched Genoa births 1820-1850, no records for Milanese"
  • FamilySearch - No match (Dec 24, 2024)  
    "Checked Italy collection, surname not found"

Gap: Missing Birth Date
  • (no searches yet)

[View All] [+ Log Search]

4. Quick Filters by Search Status

Add filter options to Research Queue:

• Never searched - prioritize untouched tasks
• Partially searched - some sources tried
• All searched, no match - might need different approach
• Has possible matches - needs human review

5. Source-Aware Progress (Advanced)

Cross-reference previous_searches with sources to show:

Sources for this task:
  ✓ Antenati (searched Dec 25 - no match)
  ✓ FamilySearch (searched Dec 24 - no match)  
  ○ WikiTree (not searched - API available)
  ○ Geneanet (not searched - requires login)

Implementation Notes

• previous_searches already exists on ResearchTask type
• Data is fetched but only length is used currently
• Could add search_status computed field: NOT_STARTED | IN_PROGRESS | EXHAUSTED | HAS_LEADS
• Consider caching/batching if expanding all rows

Priority

Medium - improves research workflow efficiency significantly, especially for AI agent collaboration where knowing what's been tried is critical.