fix(statistics): align geographic grouping and show missing-parent entries

[stef-k]

Location summaries counted bare names while details grouped by parents, and Timeline hid groups with missing parents. Use one database-side normalization/grouping definition across summary and detail statistics, show missing-parent sections, and select one settlement representative deterministically when timestamps tie.

Trim only outer ASCII whitespace and apply the single approved read-time correction from East Macedonia and Thrace to Eastern Macedonia and Thrace under exact country Greece. Preserve original records, API shapes, date semantics, search/edit behavior and #572 mappings. No migrations, data rewrite, new identity infrastructure or provider contact. Closes #573.

Validation:

• Independent review READY FOR PR at 4356848, no reachable blockers across all ten files.
• Fresh reviewer selection: 35 service/controller tests with PostgreSQL enabled, zero skips; 2 production-renderer client tests. Both complete Timeline callers bundle successfully in memory.
• Retained behavioral red demonstrates summary/grouping mismatch and hidden-parent rendering. Retained 109-test compatibility and other selections overlap; totals are not additive.
• PostgreSQL proof verifies unchanged stored scalar values, user/date membership, ordered averages and tied representative selection. Parameterized queries, C collation and ordinal output tie-breakers inspected.
• Code Guard complete-branch REVIEW only: cohesive aggregation/rendering, existing Timeline callables and allowances, historical changelog. No FAIL/INCOMPLETE or policy/baseline changes. Whitespace passed.

Limits: local generated dist bundles are stale and are not current-head evidence. Fresh bundling and inspected Release/publish/static-serving conventions cover integration; no published/browser observation or screenshot is available. No full-suite-green claim. Statistics still represent recorded parent-scoped labels, not universal geographic identity; same-named settlements under identical parents remain indistinguishable and other aliases can still split entities.

Merge gate: successful GitHub Actions test on the exact current PR head.