feat(templates): improve highlight date and time in template list created/updated column

[Kraci]

Improve highlighting of the date and time in the Created/Updated columns of the
Templates list to better visually group rows by day.

Why?

Team behavior is split: most teams have only a few templates (dates alone
differentiate rows), while templates-heavy teams create dozens to thousands per
day (only times differentiate rows). For ~65% of active paying teams the first
page of the table mixes both regimes, so a fixed emphasis on either the date or
the time is wrong for part of the page. The highlight now adapts per row and
emphasizes the part that actually changed.

Highlight rules

For each row, its date is compared with the rows directly above and below
(per column):

• New date (differs from the row above): the date is rendered using
  text/primary.
• Start of a same-day group (new date + the row below shares it): both the
  date and the time are rendered using text/primary.
• Continuation of a same-day group (the row above shares the date): only the
  time is rendered using text/primary; the date drops to text/tertiary.
• Everything not promoted (including the timezone suffix) stays text/tertiary.

This applies to both the Created and Updated columns at all times, regardless of
which column the table is sorted by or the sort direction. (Previously the logic
only ran on the actively sorted column.)

[linear-code]

EN-1151

[vercel]

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Project	Deployment	Actions	Updated (UTC)
web	Ready	Preview, Comment	Jul 8, 2026 2:06pm

[chatgpt-codex-connector]

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[claude]

LGTM — self-contained visual tweak to template list date/time highlighting.

Extended reasoning...

Overview

Single-file change in src/features/dashboard/templates/list/table-cells.tsx. Refactors the two near-identical CreatedAtCell / UpdatedAtCell renderers into a shared DateTimeCell that compares each row's date against its immediate neighbors to decide whether the date part, time part, or both get emphasized. Also removes the previous restriction that only ran the highlight logic on the actively sorted column.

Security risks

None. Pure presentation logic operating on already-rendered data — no auth, network, storage, or user input surfaces are touched.

Level of scrutiny

Low. This is a cosmetic/UX change: two className branches swap between text-fg and text-fg-tertiary based on neighbor comparisons. Worst case is a visual glitch that doesn't affect functionality or data. The 'use no memo' directive plus getRowModel().rows access is a reasonable pattern for reading sibling row state in TanStack Table.

Other factors

• The prior Codex bot comment about isSortedColumn skipping the non-sorted column is explicitly addressed in this iteration (comment marked resolved) — the current code runs the same logic on both columns unconditionally.
• Fallback behavior is preserved: when datePart is missing, both flags default to false, keeping tertiary styling.
• Vercel preview build is green.