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Adopts #31765 (original by @gerbermichi), splitting the time-grain formatting fix out from the i18n change and breaking-change concerns raised on that PR. Time-series and mixed time-series tooltips now honor the chart's time grain (and any dashboard-level override delivered via extra_form_data) when no explicit tooltip time format is set, matching the behavior the x-axis already applies via getSmartDateFormatter. Tooltips read grain-appropriate labels such as 'Jan 2021' (month), '2021 Q1' (quarter), '2021' (year), and weekly date ranges. An explicit custom tooltip format always wins. The original PR threaded the grain through getTimeFormatter using the SMART_DATE_VERBOSE_ID format id, which produced the literal string 'smart_date_verbose' because getTimeFormatter treats the id as a d3 format string when a granularity is supplied. This reworks the tooltip path to use the granularity formatter (getTimeFormatter(undefined, grain)) instead, with unit-test coverage proving the rendered output for each grain. Adds an UPDATING.md note per villebro's request. Co-Authored-By: Michael Gerber <michael.gerber@nxt.engineering> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>