Fire Mode: Prepare fire dialog

[0nko]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1207418217763355/task/1215767831573342?focus=true

Description

This PR updates the copy and prepares the single tab fire dialog for Fire mode.

Steps to test this PR

Prerequisite: an internal build with Fire mode enabled (the fireMode / fireTabs remote feature flag on).

Fire mode — new dialog copy

• Switch to Fire mode and open a regular website tab (e.g. example.com).
• Tap the Fire button. Verify the dialog title reads "Delete Fire Tabs and their data?" with Delete This Tab and Delete All buttons. Dismiss without clearing.

Regular mode — copy unchanged (regression)

• In Regular mode, open a website tab and tap the Fire button. Verify the title still reads "Delete tabs and site data?" with the same buttons.

Duck.ai chat tab — copy unchanged

• Open a Duck.ai chat tab (either mode) and tap the Fire button. Verify the title still reads "Delete this chat?" with a single Delete Chat button.

---

Note

Medium Risk
Changes user-facing copy and branches the Fire button delete-all path away from real data clearing in Fire mode (stub until follow-up), so testers should confirm users are not misled that data was wiped.

Overview
Prepares the single-tab fire dialog for Fire mode by wiring in BrowserMode and changing copy/behavior before Fire-tab-specific clearing lands in a follow-up.

In Fire mode, the dialog title becomes "Delete Fire Tabs and their data?" (singleTabFireDialogTitleFireMode) for normal website tabs (and when Duck.ai chats are selected in manual clear options). Duck.ai chat tabs still use the existing Duck.ai title. Regular mode titles are unchanged.

Delete All is split by mode: regular mode keeps the existing manual fire clear path (pixels, wide events, clearDataUsingManualFireOptions). In Fire mode, Delete All only runs the clear-started/optional animation flow and does not call manual fire clear or fire the same telemetry yet; actual Fire-tab clearing is left as TODOs (same for Delete This Tab in Fire mode, which still uses the regular clear path for now).

Unit tests cover Fire-mode titles, regression for regular mode, and that Fire-mode Delete All skips clearDataUsingManualFireOptions while still emitting ClearingComplete.

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[0nko]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Fire Mode: Escape hatch #8917
• Fire Mode: Prepare fire dialog #8902 👈 (View in Graphite)
• Fire Mode: Disable chat sync  #8792
• Fire Mode: Separate Duck chat data #8791
• Fire Mode: Empty state pages #8748
• Fire Mode: Launch NTP in different modes #8742
• Fire Mode: Duck.ai and input widget theme overlay #8725
• Fire Mode: Themes and styles #8714
• develop

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