fix(custom-text-enclose): decouple indent count from the tabs choice

cj/indent-lines-in-region-or-buffer used "p\nP", so both COUNT and USE-TABS came from the one prefix argument: no prefix gave count 1 (the docstring's "4" was wrong) with spaces, and any numeric prefix that set the count also forced tabs. Indenting several spaces was unreachable interactively. The prefix argument is now the count (defaulting to 4), and tabs-vs-spaces follows the buffer's indent-tabs-mode. cj/dedent-lines-in-region-or-buffer had the same wrong "default 4" and now defaults its count to 4 too. Added interactive-path tests, since the internals were already covered.

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