slosh: defaults most people can live in, said by shaders

The out-of-the-box look, rethought as one piece:

- the compiled-in palette calms down: muted blue #7aa2f7 on the same
  neutral darks, with the colours that mean something kept semantic --
  amber bell, red-orange dead. sl0p stays one include away as the house
  style, and contrib/themes/default.kdl is the starting point written
  down (theme-tour shows it).

- derived state defaults now actually follow the theme: the scrolled
  wash is rebuilt from scroll_bg after the theme block (it used to bake
  the compiled accent), and declaring a state -- in any file of an
  include chain -- still wins. The dump writes derived states as
  comments so C-a e cannot pin what is meant to keep following.

- a bell you can see: the frame blinks three times in theme's bell
  colour then breathes until answered, and a soft diagonal shimmer --
  the bell colour halved towards default_fg, width breathing on a sine
  -- crosses the body for the same 900ms. bell_indicator false silences
  all of it; states { bell { } } replaces it like any state. since
  carries the clock dependency, so an idle session pays nothing.

- scrollback says where it continues: while scrolled, the viewport's
  top and bottom rows melt towards an edge with content past it and
  turn solid at the buffer's end. New expression variables above/below
  (lines hidden past each edge, own dependency bit, cached per scroll
  position), carried in shade_ctx_t -- SLOSH_SHADER_ABI 3 -> 4.

- expressions survive the dump: a program keeps its source and cb_chain
  writes it back, so amount="(y % 2) * 40" no longer dumps as a number.

- headers move to include/, -Iinclude everywhere; the plugin Makefile's
  SLOSH var becomes SLOSH_DIR because slosh exports SLOSH=1 into every
  pane it runs, and building from inside a session read that as a path.

- comment drift culled where features outran the prose, and the
  derivation boilerplate folded into derived_pass()/ctx_scroll().

1 files changed, 0 insertions, 94 deletions

diff --git a/src/input.h b/src/input.h
deleted file mode 100644
index adda27a..0000000
--- a/src/input.h
+++ /dev/null
@@ -1,94 +0,0 @@
-/* Input decoding: the bytes the *outer* terminal sends us -> semantic events.
- *
- * libghostty-vt encodes events outward to a pane, but nothing decodes inward,
- * so this half is ours (DESIGN.md). Decoding to a semantic event and
- * re-encoding per pane against that pane's own modes is what makes kitty
- * keyboard passthrough correct instead of approximate.
- *
- * The event carries GhosttyKey / GHOSTTY_MODS_* values as plain integers so
- * this header stays free of libghostty-vt.
- */
-#ifndef SLOSH_INPUT_H
-#define SLOSH_INPUT_H
-
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-
-typedef enum {
-  EV_NONE = 0,
-  EV_KEY,
-  EV_MOUSE,
-  EV_PASTE,
-  EV_FOCUS,
-} ev_kind_t;
-
-/* mirrors GhosttyKeyAction */
-enum { KEY_RELEASE = 0, KEY_PRESS = 1, KEY_REPEAT = 2 };
-/* mirrors GhosttyMouseAction */
-enum { MOUSE_PRESS = 0, MOUSE_RELEASE = 1, MOUSE_MOTION = 2 };
-/* mirrors GhosttyMouseButton */
-enum {
-  MBTN_UNKNOWN = 0,
-  MBTN_LEFT = 1,
-  MBTN_RIGHT = 2,
-  MBTN_MIDDLE = 3,
-  MBTN_FOUR = 4,
-  MBTN_FIVE = 5,
-  MBTN_SIX = 6,
-  MBTN_SEVEN = 7,
-};
-/* mirrors GHOSTTY_MODS_* */
-enum {
-  MOD_SHIFT = 1 << 0,
-  MOD_CTRL = 1 << 1,
-  MOD_ALT = 1 << 2,
-  MOD_SUPER = 1 << 3,
-  MOD_CAPS = 1 << 4,
-  MOD_NUM = 1 << 5,
-};
-
-typedef struct {
-  ev_kind_t kind;
-
-  /* EV_KEY */
-  int key;        /* GhosttyKey */
-  uint16_t mods;  /* MOD_* */
-  uint8_t action; /* KEY_* */
-  char text[16];  /* UTF-8 the key produced, if any */
-  uint8_t text_len;
-  uint32_t unshifted; /* unshifted codepoint, 0 if unknown */
-
-  /* EV_MOUSE */
-  uint8_t button;  /* MBTN_* */
-  uint8_t maction; /* MOUSE_* */
-  uint16_t mx, my; /* 0-indexed cell coordinates */
-
-  /* EV_PASTE */
-  const char *paste;
-  size_t paste_len;
-
-  /* EV_FOCUS */
-  bool focused;
-} input_event_t;
-
-typedef struct input_parser input_parser_t;
-typedef void (*input_cb_t)(const input_event_t *ev, void *ud);
-
-input_parser_t *input_new(void);
-void input_free(input_parser_t *p);
-
-/* Feed bytes; complete events are dispatched to cb. Partial sequences are
- * retained for the next call, so split reads are safe. */
-void input_feed(input_parser_t *p, const uint8_t *data, size_t len,
-                input_cb_t cb, void *ud);
-
-/* True when a bare ESC (or an unterminated sequence) is buffered. Call
- * input_timeout() after ~50ms of quiet to resolve it as the Escape key. */
-bool input_pending(const input_parser_t *p);
-void input_timeout(input_parser_t *p, input_cb_t cb, void *ud);
-
-/* Debug/test rendering of an event, e.g. "key ARROW_UP mods=CTRL press". */
-void input_event_describe(const input_event_t *ev, char *buf, size_t cap);
-
-#endif /* SLOSH_INPUT_H */