fix(hub): the transfers row exists from the click

Clicking Download produced nothing — no row, no icon, no panel — for as long as
it took to open somewhere to write, and then several rows at once. The streamed
path waits for the worker twice; a Save As dialog waits for a person. The row
was created after that, so the slowest part of a download happened with nothing
on screen to say it had begun.

The store gains a `prepare` step, distinct from `run`, and the order is now:
row, then target, then slot.

That last part is why the obvious fix was wrong. Taking the slot first would let
the row appear immediately, and it was tried this morning: a granted slot has to
be taken up within the node's deadline, opening a target can outlast it, and
three downloads became one. (The diagnosis at the time blamed that ordering for
revocations which were in fact a missing `touch()` call — the revert was right
for the wrong reason.) `makeLease` is called after `prepare` succeeds, never
before.

Three behaviours fall out, each with a test:

  - a dismissed dialog leaves nothing behind. `prepare` returning false drops
    the row: nothing started, so nothing should remain on screen to explain it;
  - the row takes the name the file was actually saved under, once known;
  - a refusal above the memory ceiling fails the row that is already there,
    rather than creating one to kill it.

`preparing` counts as live everywhere — badge, cancel, clearFinished, and
`_busy`, since closing a transport under a preparing transfer strands it exactly
as under a queued one. Six places asked "is this finished?" and were drifting
apart; there is one definition now.

Two mistakes in the tests, worth the note: one counted positions in an output
array by hand and was one out, which reads exactly like a failing assertion
about the code — the values are tagged now, not indexed. And
test_zip_size_limit.py's stub did not run `prepare`, so it no longer reached the
size check the file is about; it now behaves like the real store.

819 hub, 1169 node, 0 failed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGdheDLxGReuKHga3BtST

10 files changed, 10 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
index f5c0c78..1458cf2 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
@@ -578,6 +578,7 @@ export default {
   'transfers.open': 'Öffnen',
   'transfers.done': 'Abgeschlossen',
   'transfers.cancelled': 'Abgebrochen',
+  'transfers.preparing': 'Wird vorbereitet…',
   'transfers.waiting_own_slots': 'Wartet — Ihre Plätze sind belegt',
   'transfers.waiting_node': 'Wartet — {n} davor',
   'transfers.summary': '{running} laufend · {waiting} wartend',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
index e3ed844..b0430c0 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -694,6 +694,7 @@ export default {
   'transfers.open': 'Open',
   'transfers.done': 'Finished',
   'transfers.cancelled': 'Cancelled',
+  'transfers.preparing': 'Preparing…',
   'transfers.waiting_own_slots': 'Waiting — your slots are busy',
   'transfers.waiting_node': 'Waiting — {n} ahead',
   'transfers.summary': '{running} running · {waiting} waiting',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
index c509599..adfb1cc 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
@@ -574,6 +574,7 @@ export default {
   'transfers.open': 'Abrir',
   'transfers.done': 'Terminada',
   'transfers.cancelled': 'Cancelada',
+  'transfers.preparing': 'Preparando…',
   'transfers.waiting_own_slots': 'En espera — sus espacios están ocupados',
   'transfers.waiting_node': 'En espera — {n} por delante',
   'transfers.summary': '{running} en curso · {waiting} en espera',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
index 49a1071..b409927 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
@@ -577,6 +577,7 @@ export default {
   'transfers.open': 'Ouvrir',
   'transfers.done': 'Terminé',
   'transfers.cancelled': 'Annulé',
+  'transfers.preparing': 'Préparation…',
   'transfers.waiting_own_slots': 'En attente — vos slots sont occupés',
   'transfers.waiting_node': 'En attente — {n} devant',
   'transfers.summary': '{running} en cours · {waiting} en attente',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
index 8f1ef1e..7e6246e 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
@@ -577,6 +577,7 @@ export default {
   'transfers.open': 'Apri',
   'transfers.done': 'Completato',
   'transfers.cancelled': 'Annullato',
+  'transfers.preparing': 'Preparazione…',
   'transfers.waiting_own_slots': 'In attesa — i suoi posti sono occupati',
   'transfers.waiting_node': 'In attesa — {n} prima',
   'transfers.summary': '{running} in corso · {waiting} in attesa',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
index 7ea9789..a74eec9 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
@@ -569,6 +569,7 @@ export default {
   'transfers.open': '開く',
   'transfers.done': '完了',
   'transfers.cancelled': 'キャンセル済み',
+  'transfers.preparing': '準備中…',
   'transfers.waiting_own_slots': '待機中 — 自分の枠がすべて使用中です',
   'transfers.waiting_node': '待機中 — 前に {n} 件',
   'transfers.summary': '実行中 {running} · 待機中 {waiting}',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
index 74cd269..a7d64f7 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
@@ -578,6 +578,7 @@ export default {
   'transfers.open': 'Openen',
   'transfers.done': 'Voltooid',
   'transfers.cancelled': 'Geannuleerd',
+  'transfers.preparing': 'Voorbereiden…',
   'transfers.waiting_own_slots': 'Wacht — uw plaatsen zijn bezet',
   'transfers.waiting_node': 'Wacht — {n} ervoor',
   'transfers.summary': '{running} bezig · {waiting} wachtend',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
index 584e5f2..5bd34fb 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
@@ -590,6 +590,7 @@ export default {
   'transfers.open': 'Otwórz',
   'transfers.done': 'Zakończony',
   'transfers.cancelled': 'Anulowany',
+  'transfers.preparing': 'Przygotowywanie…',
   'transfers.waiting_own_slots': 'Oczekiwanie — Twoje miejsca są zajęte',
   'transfers.waiting_node': 'Oczekiwanie — {n} przed',
   'transfers.summary': '{running} w toku · {waiting} oczekuje',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js
index b034117..102ec92 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js
@@ -576,6 +576,7 @@ export default {
   'transfers.open': 'Abrir',
   'transfers.done': 'Concluída',
   'transfers.cancelled': 'Cancelada',
+  'transfers.preparing': 'Preparando…',
   'transfers.waiting_own_slots': 'Aguardando — seus espaços estão ocupados',
   'transfers.waiting_node': 'Aguardando — {n} na frente',
   'transfers.summary': '{running} em andamento · {waiting} aguardando',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
index ffe2cb0..6b64785 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
@@ -557,6 +557,7 @@ export default {
   'transfers.open': '打开',
   'transfers.done': '已完成',
   'transfers.cancelled': '已取消',
+  'transfers.preparing': '准备中…',
   'transfers.waiting_own_slots': '等待中 — 您的通道已占满',
   'transfers.waiting_node': '等待中 — 前面还有 {n} 个',
   'transfers.summary': '进行中 {running} · 等待中 {waiting}',