Give the phone its pins: an editor section and chips on Files

The data was never the gap — HostSecret.PinnedPaths syncs and merges on both
heads, and the desktop's drawer has staged it since v5 — the phone just had
nowhere to add, remove or use a pin. Now it has both halves.

The host editor page gains a QUICK ACCESS section over the same shared
staging the drawer binds (EditorPinnedPaths, AddEditorPin, RemoveEditorPin),
with the remove target at this head's 44dp touch floor rather than the
desktop's 22-pixel close box, and no folder glyph because this head embeds no
icon font for one. The page also gains a Status line of its own: the add
command's five refusals speak through Status, and this page covers the screen
that normally draws it — a refusal nothing shows is no refusal at all.

The Files screen draws the connected host's pins as chips between the
breadcrumb and the listing, each running GoRemoteCommand exactly as a crumb
does. They are captured at connect, like ConnectedTo and the session facts
before them; a bucket gets none, having no HostSecret to pin anything on.
Covered headlessly in ShellFlowTests — connect populates, disconnect clears,
a bucket stays empty — and by manual checks 8.18 and 8.19, whose phase
preamble also stops claiming thirteen checks when it lists twenty-one.

docs/design-import-gaps.md

@@ -258,7 +258,7 @@ the chrome, hosts and terminals, file transfer, the vault, teams, and preference
 > | The host card as a link straight to a terminal | Click still selects, double-click still connects, and the pencil still opens the pane — the mock's card-as-link is not adopted, because multi-select (Ctrl, Shift, the marquee band) depends on a plain click meaning "choose this one" rather than "go". |
 > | Quick connect's SSH/SFTP kind column | The auth word — credential, key, or password — see above. |
 > | A collapsed section staying collapsed after a restart | In memory only, for the running session. `settings.json` holds two scalars by decision — the terminal's text size and whether this machine checks for updates on its own — and collapse state is not judged worth a third. |
-> | QUICK ACCESS's editor, on the phone | **Deferred; the data is not.** `HostSecret.PinnedPaths` is shared, synced and merged on both heads, so a pin made on the desktop reaches the phone and back — Android just has nowhere yet to add or remove one itself. |
+> | QUICK ACCESS's editor, on the phone | ◆ **Shipped, over the same shared data the deferral above described.** The phone's host editor draws its own QUICK ACCESS section on the same staged `VaultViewModel.EditorPinnedPaths` the desktop's drawer binds — a row per pin, an add field and button, and a remove target sized to this head's 44dp touch floor rather than the desktop's 22-pixel close box. `AddEditorPinCommand`'s refusals surface through a `Status` line the editor page draws for itself, since that page covers the whole screen and the list behind it draws its own `Status` off-screen for as long as it is open. The pins themselves reach a second surface this head has that the desktop does not need: `TransfersViewModel.ConnectedPinnedPaths` carries them as chips on the Files screen while connected, and tapping one runs `GoRemoteCommand` — the same command the breadcrumb trail already used to navigate. Two deviations from the desktop, both named where they land: the chip row is a snapshot taken at connect rather than a live follow of the vault, so a pin edited mid-session shows up on the next connect rather than this one; and the editor's own hint sentence says the pins appear on the Files screen, not above a terminal — this head has no terminal strip for them to sit above, the same honesty the row below already states for the desktop's own hint. |
 > | Collapse All beside every section's own collapse chevron | Bound on every heading's view model and shown on only the first — `SidebarGroupHeader.IsFirstBoardSection` is what a virtualised list of sections uses in place of a control of the board's own that would otherwise have to sit above all of them. |
 > | The QUICK ACCESS hint's claim that pins live in a sidebar | "Pinned folders appear above the terminal for this host." — no sidebar exists on this screen for the sentence to point at, so the shipped hint says where they actually draw. |
 > | The mock's "Saving to **DodoTech ▾** vault" subtitle, with a picker's chevron inside a sentence | The pre-existing `DrawerSubtitle` wording — the vault's name alone, unchanged by this pass. A chevron inside running text implies the text itself is the control, which it is not: the vault picker is its own element, shown only while creating and only above one writable vault, as it always has been. |