fix(twig): readtime() returns "0" for texts shorter than 200 words

[ArnaudLigny]

Problem

readtime() is documented to return the estimated reading time in minutes, with a 1 minute minimum. For any text shorter than 200 words it returns "0" instead:

{{ readtime(page.content) }} min  {# → "0 min" on a short post #}

Cause

$min = floor($words / 200);
if ($min === 0) {
    return '1';
}

floor() returns a float, so the strict comparison 0.0 === 0 is always false and the minimum guard is dead code. (string) 0.0 then yields "0".

Fix

Cast to int and enforce the minimum with max(), so it holds whatever the word count:

$min = (int) floor($words / 200);

return (string) max($min, 1);

Tests

Adds tests/Unit/Renderer/Extension/ContentTest.php covering the 1 minute minimum (null, empty string, short text), the 200 words/minute rate, and that markup is ignored.

The full unit suite passes (243 tests), phpstan is clean, and php-cs-fixer reports no change on the touched files.

Note (out of scope)

While writing the tests I noticed two unrelated quirks of the current implementation, left untouched here:

• strip_tags() concatenates words across tag boundaries (<p>a</p><p>b</p> → ab), so the count is slightly low on markup without whitespace between blocks;
• str_word_count() is ASCII-oriented and undercounts accented words, so non-English content reads as shorter than it is.

Happy to open a follow-up if you want either addressed.

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