feat(terminal)!: pointer reporting, synchronized updates and the kitty keyboard protocol

[clearloop]

Released as 0.1.24.

• Emulator::mouse_mode is what a program wants done with the pointer — 1000, 1002, 1003, the 1006/1005 encodings and 1007 alternate scroll — and view::mouse_bytes turns an action and a cell into the report, answering None where the event is the user's so the host runs its own selection instead
• Emulator::render_hold serves the grid as it stood when mode 2026 went on; the emulator has no clock, so release_hold and HOLD_TIMEOUT are what a host arms against a program that dies mid-frame
• The kitty keyboard protocol: Emulator::keyboard_mode reads back the pushed flags and view::keystroke_bytes encodes against them — CSI u for flags 1 and 8, event types on flag 2, text on flag 16, the shifted key on flag 4, and F3 moved off its legacy CSI 1;<mod>R
• kitty::Display carries c, r and C, so a program can state a cell extent outright and draw over what is there without reserving rows
• A placement anchors every cell of its top row, so text written over an image's left no longer takes it off the grid
• Light glass shows the backdrop it refracts: a third of the tint traded for gain, holding the tint.a / (1 - gain) product SurfaceSpec::flat reads so a build with no lens keeps its white panel

Breaking, with migrations in changelog.json:

• view::keystroke_bytes takes a KeyboardMode, a KeyEvent and the platform's KeyLayout in place of the app_cursor flag
• kitty::Store::apply answers Option<kitty::Display>
• bezel-gpui 0.3.11, the release that reports KeyLayout

Fixed: a kitty image inside a synchronized update landing under the frame's own text (emulator::NoSync), and a named key with a modifier encoding nothing — ctrl-left is now CSI 1;5D.

cargo nextest run -p bezel-terminal -p bezel-theme: 169 passed.