special: keys go to a tile, and Esc only ever leaves

Inside the special workspace the agenda and the calendar could only be
reached with Alt-h/j/k/l, which a desktop that binds Alt to its own windows
never lets through, and the same keys meant two things: t on the agenda put
the whole workspace away, t elsewhere went to it. Three esc buttons, one per
tile, all closed everything.

Now b, t and C only ever go to their tile, from anywhere. Tab and Shift-Tab
walk the tiles, as they walk the spaces elsewhere; l past the board's last
list goes on into the agenda, h in the agenda back to the board, j past its
end into the calendar. S toggles the workspace, and q and Esc leave it from
whichever tile — after leaving fullscreen first. The tile buttons are gone;
each tile's head shows its key instead, lit on the one with focus, and the
bar has a special pill beside the spaces.

A document opened from the workspace — a day of the calendar, an entry of
the agenda, today's entry, a card's notes — comes back to the tile it was
opened from on q.

The board tile shows the board of the space being browsed, or else the last
one shown, so coming from the diary, which has none, no longer leaves it
empty. Card and list actions follow the board on screen, not the browsed
space.

docs/wiki/Boards-and-Agenda.md

@@ -4,30 +4,38 @@
 
 The board, the agenda and the [calendar](Diary.md#the-calendar) share one
 workspace of their own, as the desktop's special workspace holds what is
-looked at in passing. `S` (or `:special`) puts it up and away again. It is
-three tiles: the board on the left, the agenda over the calendar on the right.
+looked at in passing. `S` (or `:special`, or the `special` pill in the bar)
+puts it up and away again. It is three tiles: the board on the left, the
+agenda over the calendar on the right.
 
 ![The special workspace](../images/board.png)
 
 | key | what it does |
 | --- | --- |
 | `S` | put the special workspace up, or away |
-| `b`, `t`, `C` | straight to the board, the agenda or the calendar; again on the one with focus puts the workspace away |
-| `Alt-h` / `Alt-j` / `Alt-k` / `Alt-l` | focus the tile that way |
+| `b`, `t`, `C` | to the board, the agenda or the calendar, from anywhere |
+| `Tab` / `Shift-Tab` | the next / previous tile |
+| `Alt-h` / `Alt-j` / `Alt-k` / `Alt-l` | the tile that way |
+| `l` past the last list, `h` in the agenda, `j` past its end | on into the tile beside |
 | `f` | the focused tile fills the screen; again or `Esc` to leave |
 | `1` … `9` | switch space, and the board with it |
-| `q`, `Esc` | back to the tree |
+| `q`, `Esc` | leave, back to where you were |
 
-The keys go to the tile with focus, which wears the light border; the other
-tiles keep their cursors, dimmed. Everything in it is read again each time it
-comes up.
+The keys go to the tile with focus, which wears the light border and its key
+lit in its head; the other tiles keep their cursors, dimmed. `b`, `t` and `C`
+only ever go to their tile, and `Esc` only ever leaves — or, with a tile
+filling the screen, leaves that first. A document opened from the workspace —
+a card's notes, a day of the calendar, an entry of the agenda, `T` — comes
+back to the tile it was opened from on `q`. Everything in it is read again
+each time it comes up.
 
 ## The board
 
 Every space except the diary has a board. `b`, the board button on the rail, or
-`:board` shows it in the special workspace, and `q` goes back to the tree. The
-head of the board names every space that has one, with the digit that goes
-there.
+`:board` shows it in the special workspace, and `Esc` goes back to the tree.
+It is the board of the space being browsed, or, in a space without one such as
+the diary, the last board shown. The head of the board names every space that
+has one, with the digit that goes there.
 
 A new board has three lists: `backlog`, `doing` and `done`. The lists mean
 something by where they stand, not by their names:
@@ -55,7 +63,7 @@ a week fold away until `z` shows them.
 | `z` | show done cards older than a week |
 | `F` | a letter over every card; type it to jump there |
 | `x`, `dd` | delete the card |
-| `q`, `Esc` | put the special workspace away |
+| `q`, `Esc` | leave the special workspace |
 
 ### Capturing a card
 
@@ -121,14 +129,15 @@ special workspace beside the board.
 
 | key | what it does |
 | --- | --- |
-| `j` / `k` | down / up, on into the diary entries |
+| `j` / `k` | down / up, on into the diary entries, then into the calendar |
+| `h` | to the board |
 | `Enter` | to the card on its own board, in the tile beside, or open the entry |
 | `Space` | finish the card where it stands |
 | `D` | due date |
 | `H` / `L` | to the list left / right on its board |
 | `:` | the command line with the agenda kept up, so `:repeat` acts on the card |
 | `T` | today's diary entry |
-| `t`, `q`, `Esc` | put the special workspace away |
+| `q`, `Esc` | leave the special workspace |
 
 The agenda opens by itself once a day when something is late or due. "Today"
 is the day in `WORKSPACE_TIMEZONE`, the same as for the mails, so a browser in