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l0ng-ai 1b1e52284b feat(window): dock the code panel and the diff overlay beside the terminal (#625)
Opening a file covered the workspace. The terminal underneath kept
running and was neither visible nor typeable, so reading a file while an
agent talked was a toggle loop: open it, close it to read the reply, open
it again. The Files tree already docks; the two surfaces you go to *from*
it did not.

They dock now, as a flex sibling of the terminal column rather than a
narrower overlay — that distinction is the feature. `set_grid_size` is
driven by the terminal element's laid-out bounds, so a column takes width
away from the grid and the PTY reflows into what is left; a card painted
over half the workspace would have left the grid full width with half of
it hidden.

`overlay_top` stops ordering a pair and starts choosing between them: a
column has one child, and two `flex_1` siblings would split it and fight.
Fill mode keeps the old vector, the old opaque paint and the old platform
hoist untouched, so nothing about today's overlay changes for anyone who
picks it.

- Half the terminal column by default; drag the divider, double-click it
  to cycle a third / half / two thirds, or use the palette commands. Two
  thirds deliberately runs past the half-window cap the side panels obey
  — only the terminal's floor binds it.
- `DOCUMENT_MIN_W` joins the width budget: both side panels reserve it
  the way they already reserve each other, and the column is derived from
  the *live* sidebar and panel widths rather than their floors, so a
  panel someone dragged wider is width the terminal keeps.
- A window too narrow to seat both fills for that frame. The fallback is
  derived at render time and never stored, so widening re-docks on the
  next frame with nothing to undo.
- Fill or dock is per tab, on the header's context menu. Reading a long
  file over the whole window in one tab while an agent keeps half of
  another is the normal case, and one global switch made each of those
  flip the other. A tab that has not been told reads `document_layout`
  from the config, which is what a fresh tab starts as — and which the
  menu therefore does not write, since every untold tab is reading it.
- Everywhere but macOS the title bar spans the workspace, which left a
  bar's height of nothing above the column. The header is drawn into it,
  and behaves like the title bar it now sits in. With the detail panel
  closed the column reaches the window's right edge, so the header stops
  short of the trailing chrome through a width the tab strip's own
  reservation shares.
- The docked headers drop the traffic-light inset they never had to
  clear, and the diff header's branch name becomes the thing that yields
  so the view toggle and the close tile survive a column's width.

New in `config.json`: `document_ratio`, and `document_layout` for what a
fresh tab starts as. Four new actions, bindable and unbound by default.
2026-08-19 09:11:06 +08:00
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