fix(timeline): explicit Norwegian date format recognition in prompt

Add DD.MM.YY, D.M., diary-line format instructions so the model doesn't
skip short Norwegian dates like 18.09.25 or 6.1. Two-digit years always
treated as 20YY. Lines starting with date+colon are always events.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/LegalTools.php

@@ -308,8 +308,21 @@ PROMPT;
 Build a chronological timeline from the pasted text in {$locale}.
 
 Extract ALL dates, deadlines, milestones, and temporal references.{$focusInstruction}
+
+IMPORTANT — Norwegian date formats to recognise:
+- DD.MM.YY  (e.g. 18.09.25 = 2025-09-18, 09.04.25 = 2025-04-09)
+- D.M.YY    (e.g. 6.1.25 = 2025-01-06)
+- DD.MM.    (e.g. 18.09. — day and month without year; infer year from surrounding context)
+- D.M.      (e.g. 6.1. — day and month only)
+- DD.MM.YYYY (e.g. 18.09.2025)
+- Two-digit years: always interpret as 20YY (25 → 2025, 24 → 2024).
+- Diary / log format: lines that begin with a date followed by a colon or space are ALWAYS events.
+  Example: "18.09.25: Samtale med Davids lærer" → date 2025-09-18, event "Samtale med Davids lærer".
+  Example: "6.1. Samtaler med David"             → date unknown-year-01-06, event "Samtaler med David".
+- Do NOT skip a line just because the year is ambiguous — record what you can and set confidence accordingly.
+
 For each temporal reference provide:
-- "date": ISO 8601 date (YYYY-MM-DD) if determinable, otherwise a human-readable description
+- "date": ISO 8601 date (YYYY-MM-DD) if determinable, otherwise a human-readable description such as "06 Jan (year unknown)"
 - "date_type": one of  absolute | relative | recurring | conditional | period
 - "actor": person, institution, or party involved — or "unknown"
 - "event": concise description of what happened or is due