anthonypdawson / vector-inspector / 27908335070

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feat: persist content column overrides across sessions

User-reported issue: manually configured content columns reset to
auto-detected values after restarting Vector Inspector.

**Changes:**
- Store content column overrides in SettingsService
- Key format: "content_column_overrides.{provider_type}"
- Load persisted overrides on connection init
- Only persist manually-set columns (not auto-detected)
- Persist immediately when set_content_column() is called

**Behavior:**
- Auto-detected columns: ephemeral (not saved)
- Manual overrides: persist across app restarts
- Per-provider storage: pgvector overrides separate from lancedb, etc.

**Tests:**
- test_content_column_persists_across_instances
- test_auto_detected_columns_not_persisted
- test_override_replaces_auto_detected

Addresses Phase 3 improvement from ChatGPT review on PR #39.

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