fix(web): style custom snooze time picker like the calendar

[squidllee]

Problem

The Custom snooze dialog (Date and time tab) used two different picker styles side by side:

• Date opens a custom DayPicker calendar in a PopoverPopup with the app's
  dropdown-glass surface and primary/accent selection tokens.
• Time was a native <input type="time">, so its dropdown was rendered by
  the browser — light gray/blue, no dark-mode support, matching neither the
  calendar nor the rest of the app.

Fix

Replaced the native time input with a TimeField that mirrors the Date field:

• Outline button trigger showing the formatted time with a clock icon.
• PopoverPopup with Hour / Minute / AM-PM radiogroup columns styled with the
  same selection tokens as the calendar (bg-primary text-primary-foreground
  selected, hover:bg-accent otherwise).
• Respects Settings → timestamp format: 12-hour shows Hour/Minute/AM-PM,
  24-hour shows Hour (00–23)/Minute, locale auto-detects via Intl.
• The time state stays "HH:MM", so resolveCustomSnooze and all validation
  are unchanged.

Verification

• tsc --noEmit in apps/web: clean.
• vp lint on the file: clean. Formatted with vp fmt.
• vp test run on customSnooze.test.ts, Sidebar.snooze.test.ts,
  threadActionMenu.logic.test.ts: 38 passed.
• Drove the real app in headless Edge (dark mode) against an isolated dev
  server with a seeded thread: opened Snooze → Custom…, opened the time
  popover, picked 09 + PM, and confirmed the trigger reads 09:31 PM.

Screenshots

Before (native browser time picker)	After (app-styled popover)

After picking 09 + PM, the trigger reads 09:31 PM:

Model: Muse Spark (muse-spark) | Harness: OpenCode in T3 Code

Summary by CodeRabbit

• New Features
  • Replaced the native snooze time input with a calendar-styled time picker.
  • Added automatic 12-hour or 24-hour display based on client settings and locale.
  • Added keyboard navigation for selecting hours, minutes, and time periods, including arrow keys, Home, and End.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — The PR replaces the existing native time input with a new multi-column popover control and adds locale-aware formatting logic on the production custom-snooze path. The change is isolated and preserves the snooze data contract, but the new interaction surface is substantial enough to merit human review.

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• apps/web/src/components/CustomSnoozeDialog.tsx

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📝 Walkthrough

Walkthrough

The snooze dialog replaces the native time input with a custom popover picker. The picker parses and formats HH:MM values, supports 12-hour and 24-hour displays, and provides keyboard navigation.

Changes

Custom snooze time picker

Layer / File(s)	Summary
Time picker parsing, display, and integration apps/web/src/components/CustomSnoozeDialog.tsx	The dialog uses TimeField instead of the native time input. TimeField resolves the clock format from client settings or locale data, formats snooze times, renders selectable time columns, and updates the existing time state. TimeColumn supports roving focus with Arrow, Home, and End keys.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant CustomSnoozeDialog
  participant TimeField
  participant useClientSettings
  participant TimeColumn
  CustomSnoozeDialog->>TimeField: Provide time value and change handler
  TimeField->>useClientSettings: Read timestamp format
  useClientSettings-->>TimeField: Return timestamp format
  TimeField->>TimeColumn: Render hour, minute, and period options
  TimeColumn-->>TimeField: Return selected option
  TimeField-->>CustomSnoozeDialog: Update HH:MM time value

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Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 12530

The custom snooze picker appears ready to merge with no concrete outstanding user-facing risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: styling the custom snooze time picker to match the calendar.
Description check	✅ Passed	The description clearly explains the problem, the implemented fix, verification steps, and UI changes with before-and-after screenshots. It does not include the template's Checklist section or a short…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@apps/web/src/components/CustomSnoozeDialog.tsx`:
- Around line 385-408: Update the TimeColumn radiogroup around listRef to use
roving focus: assign tabIndex 0 only to the selected option and -1 to all
others, and add ArrowUp/ArrowDown handling that prevents default behavior, wraps
through options, selects the next value, and focuses its button. Add a stable
data attribute to each option for focus lookup while preserving existing click
selection.

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• apps/web/src/components/CustomSnoozeDialog.tsx

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[squidllee]

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[Wiktor102]

I think it is important to emphasize that this PR isn't just a styling change; it also fixes the clock format to respect settings.

Personally, I don’t care whether this remains a native control or becomes custom. The requirement is that it honors T3’s clock-format setting. I just want to be able to use 24-hour format in the picker.

[Wiktor102]

@squidllee
Hey, I see that this PR is now closed. Could you share why you closed it?
I couldn't find any other PRs that would replace it.

[Wiktor102]

I thought this was maybe fixed with orchestrator v2, but sadly not.

This is with the 24h format selected in settings.