Timeline: group same-date/actor events, clean badges, Bedrock routing

- renderTimeline(): group consecutive same-date+actor events into one card
  with a bullet list; single events keep their current layout
- Date format: YYYY-MM-DD → "1 Jun 2023" (3-letter month, international)
- Time shown in header when available
- Remove date_type badge; confidence badge replaced by amber ⚠ flag on
  low-confidence events only (high/medium border colour still shows)
- LegalTools.php: resolve azure_full/azure_mini to Bedrock Sonnet/Haiku
  when DbnBedrockGateway is active; claude_sonnet/claude_haiku also handled
- timeline.php + api/timeline.php: engine labels updated (Claude Haiku/Sonnet);
  claude_haiku + claude_sonnet added to valid engine list
- i18n engine labels updated in all 4 languages

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

api/timeline.php

@@ -8,7 +8,7 @@ dbnToolsRequireMethod('POST');
 dbnToolsRequireAuth();
 $input = dbnToolsJsonInput(1500000);
 $language = dbnToolsNormalizeLanguage($input['language'] ?? 'en');
-$_validEngines  = ['nova_lite', 'azure_mini', 'azure_full'];
+$_validEngines  = ['nova_lite', 'azure_mini', 'azure_full', 'claude_haiku', 'claude_sonnet'];
 $_requestedEngine = in_array((string)($input['engine'] ?? ''), $_validEngines, true)
     ? (string)$input['engine'] : 'azure_mini';