SPEC v0.4: M2a and M2b decisions, handoff to the real state

Records the decisions proposed in the M2a (fdf2093) and M2b (fad6fc9)
reports: D-005 OpenAPI equality normalisations and CommonRules, D-006
bp_sum_not_10000 token, D-007 per-crate no-unwrap deny, D-010 Roborazzi,
D-011 IncompleteCustomRangeException, D-012 Room 3 with M2b's entities and
1.json as a contract file, D-013 JDK 25 Robolectric flags, D-014
failOnNoDiscoveredTests (D-008, D-009 unused). Clarifications in §6, §8.2,
§8.6, §9.6, §10.3, §10.4, §11, §14.2, §14.3, §14.5, §14.7, §14.8 and
AC-11.7. PLAN-M5 builds on the existing entities; v0.4 readings added to
PLAN-M3, M5, M7b to M7f. HANDOFF rewritten: next free D-040, spec v0.5,
server schema 2, Room schema 2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

PLAN-M7e.md

@@ -30,6 +30,7 @@ Build `:feature:analytics`: the analytics screen with range, granularity, measur
 - Charts: stacked bars per bucket coloured by group with legend; category breakdown and account breakdown as horizontal bars sorted descending with amount and percent; range total above the charts; settlements never count (AC-14.6). Charts are `:core:design` components (M6).
 - Every bucket appears, empty ones as zero; percentages rounded half-up to one decimal and may not sum to 100 (AC-14.7, AC-14.10). Values come computed from the repository.
 - Tapping a bar or a breakdown row opens S-12 with the expenses behind that number; title names the filter ("Mat & hushåll, oktober 2026") (AC-14.8, §13.3 S-12).
+- `DrillDownState.title` is a `String` of unlocalised parts; S-12 formats its visible title itself from the arguments it passed to `drillDown` (the category or account, with default category names from resources, and the bucket key through `DateFormatter`) (§14.2.4, v0.4). `AnalyticsState` has no error field: the custom-range editor never applies a range with a missing start or end (the repository would treat a missing date as today) (§14.2.4, §14.5.4).
 - Archived accounts and categories are included; deleted expenses excluded (AC-14.9).
 
 ## 4. Owned paths