feat(org): right-align headline tags to the window edge

org-tags-column only right-aligns tags to a fixed column, and it does so by baking literal spaces into the file, so it can't track window width or splits. I set it to 0 (org keeps a single space, no padding) and add a font-lock rule that stretches that space with a display property pinned to the window's right edge via :align-to. That value resolves at redisplay, so the tags follow the window width and adapt to splits live, and nothing alignment-specific is written to disk.

The tags stop one column short of the edge on purpose. A glyph filling the final column wraps a non-truncated line, which dropped every tagged heading's tags onto the next line in the first cut. org-agenda-tags-column gets 'auto, the native equivalent for agenda views. Tests cover the heading regexp and the align-spec helper.

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