Ask before deleting a question, naming its answers and the rules that use it

[PhilReinking]

Deleting a question, group, choice, consent policy or rule now asks in the app's dialog instead of the browser's. The dialog names the question, its answer count and the questions whose rules stop working. A choice or policy nobody picked goes at once, also with Cmd+Backspace.

Fixes BITS-279

• Counts and rules load from the blocks API with includeSubmissions on Delete. If that fails, the dialog still asks and says "and its answers" without a number.
• The dialogs take the block and its counts as props, so the document editor (BITS-282) can place them.
• Escape closes only the delete dialog, not the logic panel under it.
• The rule's trash button now has a name and works with the keyboard.
• The dialog buttons are 44 px tall on phones, 36 px from lg.

Stacked on #264, so no CI until it targets main.

Tested: Vitest, lint, vue-tsc, build; the new tests fail on the base. By hand at 1440 and 390: all dialogs, Cancel, Escape, real deletes, a failed count load.

Not tested: the PHP suite locally. No PHP changes here; #264 has its own CI.

🤖 Generated with Claude Code

[PhilReinking]

OK at 2fcfe3b. No CI (stacked): Vitest, lint, vue-tsc and the build pass locally.

Beyond the PR text: in the logic panel, Cancel, Escape and Delete rule close only the rule dialog, and focus goes back to the trash button. A question's own rules don't count as rules that stop working. A second click on Delete hits nothing, because the buttons leave at once. One should inline.

[PhilReinking]

When the counts can't load, answers is undefined and the text reads like a question without answers, though it may have 40. The choice dialog already says "The answers that picked it" in that case.

Suggested change

	const withAnswers = answers
	? ` and its ${answers} ${answers === 1 ? "answer" : "answers"}`
	: "";
	// unknown when the counts couldn't load: there may still be answers
	const withAnswers =
	answers === undefined
	? " and its answers"
	: answers
	? ` and its ${answers} ${answers === 1 ? "answer" : "answers"}`
	: "";

[PhilReinking]

OK at 58c1716. No CI (stacked): Vitest 257, lint, vue-tsc and the build pass locally. The should from the last review is fixed.

3 new tests fail on 2fcfe3b. Beyond that: clicking trash three times fast fetches once and deletes once. When the count can't load, a choice and a policy both ask, and nothing goes. Asking again after Cancel fetches a fresh count. The server sends a count for every policy, and only agreed policies are stored.

[PhilReinking]

OK at 1f385f3. No CI (stacked): Vitest 258, lint, vue-tsc and the build pass locally.

The 2 changed tests fail on 58c1716. The built CSS has text-pretty (text-wrap: pretty), and the text on its own line renders the same.

[PhilReinking]

OK at e8da262, CI green. The merge of main changes only CHANGELOG.md by hand: main's #265 and #278 lines stay as on main, and the #269 line follows them. The PR's own diff against main is byte for byte the reviewed one from 1f385f3. A trial merge after #270 is also clean and keeps every changelog line.