refactor(deps): migrate d3 from v5.7.0 to v7.9.0

[digital-wizard48]

Changes

Version bumps

• Updated d3 from 5.7.0 to 7.9.0 in package.json
• Updated @types/d3 from 5.7.2 to 7.4.0 in package.json to match the new d3 major version

Breaking API changes addressed

d3.map() removed (d3 v6+)

In d3 v6, the d3.map(), d3.set(), d3.keys(), d3.values(), and d3.entries() collection helpers were removed in favor of native JavaScript Map, Set, Object.keys(), Object.values(), and Object.entries().

• tensorboard/components/tf_color_scale/colorScale.ts: Replaced d3.map() usages with native new Map<string, string>(). The d3 import was also removed from this file since it is no longer needed after this migration.

Other d3 v6/v7 breaking changes (not present in provided files)

• d3.event was removed; event handlers now receive the event as their first argument
• d3.mouse, d3.touch, d3.touches, d3.clientPoint were removed in favor of d3.pointer
• selection.on callbacks now receive (event, datum) instead of (datum, index, groups) with d3.event
• d3.histogram was renamed to d3.bin
• d3.ascending/d3.descending comparator argument order changed

These changes may affect other files in the codebase not included in this review.

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