docs: the guide around four things and two screens, new screenshots, the plan closed

The guide opens with documents, cards, notes and diary entries, and the
documents and plan screens, then walks the day with the scratchpad, the
info sheet and cards linked both ways. The README and the wiki's home say
the same in short, and show the scratchpad and the info sheet. The
screenshot script drops its Alt keys and takes both. PLAN.md records the
simplification's slices, what was left of its navigation fixes, and the
backlog fitted to the model.

docs/wiki/Guide.md

@@ -1,19 +1,38 @@
 # The guide: a day with the workspace
 
-This page follows one ordinary day: the agenda in the morning, notes and cards
-at work, a lecture in the afternoon, a thought on the way home, and the diary in
-the evening. Each part of the workspace is explained where it first comes up,
-with a link to the page that has the rest of it.
+This page follows one ordinary day: the agenda in the morning, documents, notes
+and cards at work, a lecture in the afternoon, a thought on the way home, and
+the diary in the evening. Each part of the workspace is explained where it first
+comes up, with a link to the page that has the rest of it.
 
 The keys are the desktop's. On a phone, every one of these has a button; see
 [On a phone](#on-a-phone) at the end.
 
+## Four things, two screens
+
+Everything you keep is one of four things:
+
+| | what it is for | where it lives |
+| --- | --- | --- |
+| **document** | the thorough record: a project, a runbook, lecture notes | the tree of a space, in folders |
+| **card** | the short, actionable summary of work, with a due date and a checklist; it usually points at a document | the board of a space |
+| **note** | a thought jotted down in passing, not sorted yet | the scratchpad, one for the whole workspace |
+| **diary entry** | a document about one day | the diary space, by date |
+
+A **file** — a PDF, an image, a log — is never on its own: it sits in a folder
+beside the documents, or belongs to the one document it was put into.
+
+They are shown on two screens. The **documents** screen has the list on the
+left and the documents open in tiles beside it. The **plan** screen has the
+board, the agenda and the calendar, and a card turned over. `S` goes from one to
+the other, and each keeps what was on it. The scratchpad comes down over either.
+
 ## Morning: what needs you
 
 The first time you open the workspace each day, the **agenda** opens by itself
 when anything is late or due. Any other time, press `t`. It is on the plan
-screen, with the board and the calendar, in place of the documents; `S` goes
-there and back again, and `Ctrl-h`/`j`/`k`/`l` walk the tiles.
+screen, with the board and the calendar; `Ctrl-h`/`j`/`k`/`l` walk between
+them.
 
 ![The agenda](../images/agenda.png)
 
@@ -33,12 +52,12 @@ Walk it with `j` and `k`. On a card:
 - `Space` finishes it, where it stands;
 - `D` gives it a due date: `fri`, `tm`, `+3d`, `10-31`;
 - `H` and `L` move it to the list left or right on its board;
-- `Enter` goes to the card on its own board, in the tile beside.
+- `Enter` goes to the card on its own board, turned over in the tile beside.
 
-`Esc` closes the agenda's tile. The bar keeps showing the `late` and `today`
+`q` goes back to the documents. The bar keeps showing the `late` and `today`
 counts while either is above zero. More in [Boards and the agenda](Boards-and-Agenda.md).
 
-## At work: spaces, documents and tiles
+## At work: documents
 
 Press `2` for the `work` space. A **space** is one area of your life, with its
 own folders, its own board and its own search. Make more with
@@ -56,17 +75,17 @@ to it and press `L` instead: it opens in a **tile** of its own.
 
 ![Two documents in tiles](../images/tiles.png)
 
-`h` and `l` move between the tiles and back to the list, `Ctrl-h` and
-`Ctrl-l` from the editor too, `q` closes one, and `f` makes the focused one
-fill the screen. Each space remembers
-its tiles, so switching away and back finds them as they were. More in
+`h` and `l` move between the tiles and back to the list, and `Ctrl-h` and
+`Ctrl-l` do the same from the editor. `q` closes a tile, and `f` makes the
+focused one fill the screen. Each space remembers its tiles, so switching away
+and back finds them as they were. More in
 [Spaces and documents](Spaces-and-Documents.md).
 
 ### Writing
 
 `i` edits the open document. The editor is CodeMirror with real vim keys:
-`ciw`, `dd`, visual mode, macros, `.` and the rest. What you write saves itself.
-`Esc` leaves insert mode, and `Esc` again or `:q` leaves the editor.
+`ciw`, `dd`, visual mode, macros, `.` and the rest. `Esc` leaves insert mode,
+and `Esc` again or `:q` leaves the editor.
 
 ![The editor](../images/editor.png)
 
@@ -79,16 +98,45 @@ to follow it.
 You do not need to save. Every keystroke goes to the browser's storage at
 once, and to the server a couple of seconds after you stop typing. If the
 network is gone, the draft waits in the browser and is sent when it comes back.
-More in [Writing](Writing.md).
+The same is true of a card's description and of a note: there is one editor,
+and it works the same way everywhere. More in [Writing](Writing.md).
 
-### Cards
+### Everything about a document
+
+`gi` opens the document's **info sheet**: its headings, its earlier versions,
+the documents that link to it, the cards about it, its files, and whether it is
+shared. `Tab` goes from one part to the next.
+
+![The cards about a document, in its info sheet](../images/info.png)
+
+## At work: notes
+
+Halfway through a paragraph a thought comes that belongs somewhere else.
+`Ctrl-Q`, even in insert mode, brings the **scratchpad** down with the last
+note open at its end. Write the thought, and `Ctrl-Q` again puts you back in
+the document where you were, still writing. `:scratch <text>` takes a note from
+the command line without the drawer.
+
+`Q` brings the scratchpad down to sort it. Each note leaves in one of three
+ways:
+
+- `K` keeps it as a document, in the folder you are browsing;
+- `C` makes it a card: the first line is the title, the rest the description;
+- `A` puts it at the end of a document, picked by title.
+
+![The scratchpad](../images/scratch.png)
+
+The notes are found by `/` like everything else. More in
+[Writing](Writing.md#the-scratchpad).
+
+## At work: cards
 
 In a meeting someone asks you to renew a certificate. Press `c`, type
 `Renew the gateway certificate`, and `Enter`. The card is in this space's
-inbox, and you have not left the document you were reading. Not a task? `Tab`
-on the same line makes it a note on the scratchpad, and `Tab` again a timed line
-in today's diary entry. A note waits there until `K`, `C` or `A` turns it into a
-document, a card, or more of a document.
+inbox, and you have not left what you were reading. When that was a document,
+the card is about it: it shows in the document's info sheet, and the
+document's meta line says what is due. `Tab` on the same line makes a note
+instead, and `Tab` again a timed line in today's diary entry.
 
 Press `b` to see the **board**, on the plan screen. A digit there shows the
 board of another space.
@@ -97,18 +145,24 @@ board of another space.
 
 The first list is the inbox and the last is done; the ones between are work in
 hand. `h`/`l` move between lists and `j`/`k` between cards. `H`/`L` move a
-card across, `Space` finishes it, and `D` sets its due date. `Enter` turns a
-card over to its labels, description and checklist, in a tile beside, and
-`gf` opens its notes: a document made for the card the first time you ask,
-opened among the documents, and `S` comes back to the board. `:repeat weekly` makes a
-card come back in the inbox each time it is finished. `q` on the board goes
-back to the documents.
+card across, `Space` finishes it, and `D` sets its due date. `:repeat weekly`
+makes a card come back in the inbox each time it is finished.
+
+`Enter` turns a card over to its labels, description and checklist, in a tile
+beside, and `q` turns it back. Keep the description short: the long version
+belongs in a document. `gf` opens the card's document, made the first time you
+ask, among the documents; `S` comes back to the board.
+
+The other way round works too. Reading a document, `gc` lists the cards about
+it, and `:due`, `:label`, `Space`, `H` and `L` act on the one picked, without
+going to the board.
 
 ### Finding things
 
-`/` searches the space you are in, as you type. `Ctrl-P` searches every space.
-The search reads the documents and the text files in the tree: a log file is
-found by a line inside it, and the result shows the words around the match.
+`/` searches the space you are in, as you type, and `Ctrl-P` every space.
+The search reads the documents and the text files in the tree, then the cards
+and the notes: a log file is found by a line inside it, and the result shows
+the words around the match.
 
 ![A search that found a log line](../images/search.png)
 
@@ -123,9 +177,13 @@ LaTeX between dollar signs and drawn by KaTeX:
 ![Math in a document](../images/math.png)
 
 The slides came as a PDF. Drop it onto the list, or `:upload`, and it is a
-file in the folder, beside the notes about it. `Enter` opens a PDF, an image, a
-video, a CSV table, a text or source file, or a certificate in place. Anything
-else downloads with `:export`.
+file in the folder, beside the notes about it. An image pasted into a document
+while writing belongs to that document instead: it is in the document's info
+sheet, `za` folds it open under the document in the list, and it moves and goes
+to the trash with it.
+
+`Enter` opens a PDF, an image, a video, a CSV table, a text or source file, or
+a certificate in place. Anything else downloads with `:export`.
 
 ![A CSV file as a table](../images/file-table.png)
 
@@ -137,7 +195,7 @@ never stored. See [The vault](Vault.md).
 
 A thought arrives when no tab is open. `:token add phone` makes a token. With
 it, an iPhone Shortcut, an Android HTTP Shortcut or a single `curl` puts a card
-in an inbox, or a line in today's diary entry:
+in an inbox, a note on the scratchpad, or a line in today's diary entry:
 
 ```sh
 curl -H "Authorization: Bearer nwc_…" -H 'content-type: application/json' \
@@ -151,10 +209,10 @@ The token can do this and nothing else. See [Capture](Capture.md).
 Press `T` for today's entry. If there is none yet it is started, from the
 diary's `templates/day` document when there is one, and opens ready to write.
 
-`C` shows the diary by month. A dot marks a day with an entry; `h`/`l`,
-`j`/`k` and `H`/`L` move by day, week and month, and `Enter` opens the day,
-or starts an entry for it. In an entry, `[d` and `]d` step to the one before
-and after.
+`C` shows the diary by month, on the plan screen. A dot marks a day with an
+entry; `h`/`l`, `j`/`k` and `H`/`L` move by day, week and month, and `Enter`
+opens the day among the documents, or starts an entry for it. In an entry, `[d`
+and `]d` step to the one before and after.
 
 ![The diary by month](../images/calendar.png)