Merge branch 'fix/large-download-paths'

Concurrent-transfer limits, with the queue, the pause and the flag day.

A node now caps how many transfers it runs at once (8 downloads, 8 uploads,
node-wide) and how many one member may run in one group (2 by default,
operator-signed). Beyond that the node answers "queued" and the client waits its
turn, visibly, in the transfers panel — and a slot that frees starts whatever is
next, skipping past a member who is at their own cap rather than letting them
stall everyone behind them.

Browsing is never subject to a slot: not the poster grid, not the covers, not
opening a photo to look at it. That is structural — a transfer is what the
transfers widget shows — and the exemption is bounded rather than open, at two
files in flight per session, because an exemption with no bound is a leaseless
branch under another name.

Transfers can be cancelled, and now paused and resumed. A paused one holds
nothing: its slot goes back at once and resuming rejoins the queue at the tail.
Uploads survive the connection that started them and resume where the node
stopped, asked for inside the seal rather than on a clear message. What they
leave behind when they are abandoned is reaped, which closes a disk leak that
predates this work.

MNP 3.0 makes the lease compulsory and refuses 2.x at the handshake, with the
desktop client checking `client.minimum` before connecting so an un-updated one
says "update" instead of failing every connection in a protocol vocabulary.

Fourteen defects were found on the way, eight of them by a person clicking
Download and pasting a console — none of which 2075 tests could reach. Section
12 of ~/next/improve-downloads.md is that report, including the three this work
introduced itself and the one that turned out to be caused by an instruction to
hard-reload after each deployment.

Node suite 1209 passed, hub suite 866 passed.

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

1 files changed, 25 insertions, 1 deletions

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 c55a702..cb7f4a0 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -162,6 +162,8 @@ export default {
   'group.mkdir': 'New folder',
   'group.mkdir_prompt': 'New folder name',
   'group.mkdir_offline': 'Not connected to the node.',
+  'group.download_offline': 'Not connected to the node — the download cannot start. It reconnects on its own; try again in a moment.',
+  'group.download_write_stalled': 'The file stopped being written to disk ({seconds}s with no progress). The download was stopped rather than left hanging; try it again.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
   'device.add_btn': 'Get a linking code',
@@ -214,6 +216,8 @@ export default {
   'video.from_start': "Start from the beginning",
   'video.close': 'Close (Esc)',
   'preview.pdf_fallback': 'This browser will not display the PDF inline. Download it instead — it was decrypted here either way.',
+  'preview.too_large': 'This file is {size}, more than this page can hold in memory ({limit}). Download it instead — a download is written straight to disk.',
+  'download.too_large_for_memory': '"{name}" is {size}. This browser can only save a file that large by streaming it to disk, and it has no way to do that here — it would have to hold the whole file in memory. Reload the page and try again; if that does not help, use the desktop app.',
   'group.upload_indexing': 'indexing…',
   'video.err_transport': 'Transport not connected',
   'video.err_mse': 'Codec not supported for streaming: {codec}',
@@ -311,7 +315,7 @@ export default {
     + 'including when you download a selection.',
   'settings.dl_folder': 'Folder: {name}',
   'settings.dl_no_folder': 'No folder chosen — downloads go wherever your browser '
-    + 'puts them',
+    + 'puts them, and they cannot be paused',
   'settings.dl_choose': 'Choose folder',
   'settings.dl_change': 'Change',
   'settings.dl_forget': 'Forget',
@@ -690,6 +694,24 @@ 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',
+  'transfers.group_running': 'Running',
+  'transfers.group_waiting': 'Waiting',
+  'transfers.group_paused': 'Paused',
+  'transfers.group_finished': 'Finished',
+  'transfers.cancel_one': 'Cancel {name}',
+  'transfers.pause': 'Pause',
+  'transfers.resume': 'Resume',
+  'transfers.paused': 'Paused',
+  'transfers.not_pausable': 'Cannot be paused — choose a download folder in Settings to enable it',
+  'transfers.pause_one': 'Pause {name}',
+  'transfers.resume_one': 'Resume {name}',
+  'transfers.eta_seconds': '{n}s left',
+  'transfers.eta_minutes': '{n} min left',
+  'transfers.eta_hours': '{n} h left',
   'transfers.failed': 'Failed',
   'group.select': 'Select',
   'group.select_done': 'Done',
@@ -888,6 +910,8 @@ export default {
   'node.setting_pair_ttl': 'Pairing code TTL',
   'node.setting_device_ttl': 'Device request TTL',
   'node.setting_max_streams': 'Max concurrent streams',
+  'node.setting_max_downloads': 'Max concurrent downloads',
+  'node.setting_max_uploads': 'Max concurrent uploads',
   'node.setting_transcode': 'Transcode incompatible video',
   'node.setting_unit_hours': 'hours',
   'node.setting_unit_minutes': 'min',