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.

1 files changed, 11 insertions, 5 deletions

diff --git a/src/tutor.txt b/src/tutor.txt
index 8124cd42..7bba698b 100644
--- a/src/tutor.txt
+++ b/src/tutor.txt
@@ -118,11 +118,13 @@
  "Delcol" still exists as a command: type it in
  a tag or body and execute it to close the whole column. A SEPARATE bar
  across the top of the screen holds the window-agnostic builtins:
-   Kill  Newcol  Tutor  Debug  Colors  NextColor
+   Kill  Newcol  Tutor  Debug  NextColor  Dump
  Middle-click "Newcol" for a new column, "Tutor" to spawn this tutor,
- "Kill" to quit; Debug/Colors/NextColor toggle the stats overlay, the
- syntax/ansi recolor, and the theme. Every one of them also has a KEY
- PATH under SPC (part 3.7): SPC ? lists the lot, "Help" included.
+ "Kill" to quit; Debug toggles the stats overlay and NextColor cycles
+ the theme. The bar holds only what you reach for often — the rest of
+ the builtins are words you execute and keys you press. Every one of
+ them has a KEY PATH under SPC (part 3.7): "Colors" (the syntax/ansi
+ recolor) is SPC t c, "Crt" is SPC t r, and SPC ? lists the lot.
  Right-click a directory in any body to open a terminal there.
 
  SEARCH: `/` in normal mode types a pattern into that pane's own tag (it
@@ -474,6 +476,10 @@
    SPC f s / f f    Save / Find          SPC h t Tutor (this file)
    SPC c n / c d    Newcol / Delcol
    SPC t d/c/n/r    Debug / Colors / NextColor / Crt toggles
+   SPC t p/l/a      Petscii / Palette / Ascii: an image pane's
+                    renderer — glyph art instead of pixels, the C64
+                    palette or the terminal's own 16, and whether
+                    letters join the matcher's glyph set
    SPC s d / s r    Dump / Restore the session
    SPC w h/j/k/l    Left/Down/Up/Right: focus the pane that way
    SPC w t          Toggleterm: hop between the last document you
@@ -496,7 +502,7 @@
                 chords: 1-2 cut  1-3 paste  (both in one hold = snarf)
                 2-1 = middle-exec with the left selection as argument
                 file tag = mode + path + "Save Del"; other tags show Del
-                top bar = Kill Newcol Tutor Debug Colors NextColor
+                top bar = Kill Newcol Tutor Debug NextColor Dump
  WEB TOUCH:     one-finger tap = LOOK; drag = natural scroll
                 LOOK opens URLs or embedded tracked .zig source (read-only)
                 published TTY dump lists every source; tree-sitter colors it