trim the taglines: image renderer toggles and Colors/Crt become leader-only

The image tag spelled out `Petscii <C64|Term> Ascii` and actOnSelection
matched those words by hand before the builtin dispatch. They are three
real Builtins now (SPC t p/l/a), so the by-word matching is gone, the tag
is a plain `img <path> Del`, and with nothing live left in it the image
early-returns in curTail, enterTagEdit and the tag-click guard go too — an
image tag edits like every other pane's.

Colors and Crt leave the topbar for SPC t c / SPC t r: set-once display
switches should not spend width in a bar you read every frame. NextColor
stays, it is the one you cycle repeatedly. Both remain full builtins.

The snap scripts that clicked those words now press the leader instead, and
images.snap finally exercises the palette and ascii toggles for real: its
old clicks at x=57 landed on the neighbouring shell's tag, so that toggle
had never been covered. The test PPM grew to 512x512 with LCG noise so the
ASCII bitmaps actually win cells and dropping them visibly changes the art.

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