refactor: split custom-misc.el into focused modules

custom-misc.el was an incoherent grab-bag, so anything small defaulted to landing there. I split its eight commands by concern. Three moved into new modules: custom-format (region/buffer reformat), custom-counts (word and character counts), and custom-text-transform (fraction glyphs). The other three went to existing homes: the previous-buffer toggle to custom-buffer-file, the delimiter jump to custom-line-paragraph, and the align-regexp space advice with its alignment and fill bindings to custom-whitespace.

The C-; bindings, which-key labels, and the six test files moved with their functions, and custom-misc.el is deleted. No behavior change: every command keeps its name and its C-; key.

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