Lets desktop users collapse the session-list sidebar to maximise the chat
area, without adding any visible UI affordance. Default appearance is
identical to master — only users who actively try to toggle (or know the
keyboard shortcut) ever see a difference.
## Behaviour (desktop only, ≥641px)
| State | Action | Result |
|------------------------------------|-----------------------|-----------------------------------------|
| Sidebar open, click active rail | Toggle | Sidebar collapses to width:0 |
| Sidebar open, click different rail | Normal switch | **Sidebar stays open** (no surprise) |
| Sidebar collapsed, click any rail | Expand + switch | Sidebar expands, then panel switches |
| Anywhere, Cmd/Ctrl+B | Toggle | Same as same-active-rail click |
| Mobile (<641px), any of the above | No-op | Mobile overlay behaviour unchanged |
Two discoverability paths, both opt-in. **No new visible buttons.** Users
who never click the active rail icon see zero UI change vs. master.
## Surface-minimal design
The behaviour is contained behind one extra arg on the rail/sidebar-nav
onclick: `switchPanel('chat',{fromRailClick:true})`. Without that flag the
function preserves master's behaviour exactly — every programmatic
`switchPanel(name)` callsite (commands, deeplinks, internal state changes)
is unaffected. The guard chain inside `switchPanel`:
opts.fromRailClick && _isDesktopWidth() && (
_isSidebarCollapsed() ? expandSidebar() :
prevPanel === nextPanel ? (toggleSidebar(true); return false))
is the ONLY new code path that can cause a collapse. Cross-panel clicks
fall through to the existing switch logic untouched.
## Polish from both source PRs
- **Click-active gesture** as the primary toggle (#1884 @jasonjcwu — the
genuine UX innovation; no extra button needed)
- **Cmd/Ctrl+B keyboard shortcut** (#1924 @spektro33; VS Code convention).
Guarded against firing when typing in INPUT / TEXTAREA / contenteditable
so the shortcut never steals from in-progress text editing.
- **Inline flash-prevention `<script>`** in `<head>` (#1924) sets
`data-sidebar-collapsed='1'` on `<html>` BEFORE the stylesheet loads,
so cold loads with a persisted-collapsed state paint correctly from
frame 0 with no flicker. Cleared by JS once the class system takes over.
- **Smooth slide animation** via `.24s cubic-bezier(.22,1,.36,1)`
(#1924, mirrors the existing workspace-panel collapse on the right)
- **`aria-expanded` mirrored** on the active rail button (#1884) so
screen readers announce open/collapsed transitions.
- **`body.resizing` transition-suppression** (#1884) keeps the drag-resize
cursor instant — no animation during a width-resize gesture.
- **bfcache `pageshow` re-sync** (#1884) — if another tab toggled the
sidebar while this page was frozen, bring it in line on restore.
## Drops vs. #1924
- No persistent rail "toggle sidebar" button (Nathan: keep the UI stealth)
- No close-X button in chat panel head (same reason)
- No i18n keys for the dropped buttons
## What did NOT change
- 22 rail/sidebar-nav `onclick` handlers gained the `{fromRailClick:true}`
arg — function-call shape, invisible to users
- 1 inline `<script>` in `<head>` (flash prevention) — invisible
- 5 lines of CSS — invisible unless someone collapses
That's the entire visible-UI delta. **23 ins / 22 del on `index.html`,
all string-replace.**
## Verification
- 5,151 pytest passing including a new 34-test structural suite covering
every contract (CSS rules, JS functions, fromRailClick guard, legacy
proxy forwarding, flash-prevention `<script>` ordering, mobile
exclusion via :not(.mobile-open) selector, aria-expanded sync).
- Live browser walkthrough at 1280px verified:
- Default boot state identical to master (sidebar open, width 300px)
- Click active rail → collapse (width 1, opacity 0, translateX -14px,
localStorage='1', aria-expanded=false). Panel unchanged.
- Click active rail again → expand back to width 300, aria=true
- Click DIFFERENT rail → normal switch, sidebar stays open (legacy-
preserving case, verified explicitly)
- Click rail while collapsed → expand + switch in one gesture
- Cmd+B toggles correctly
- Cmd+B inside `<textarea>` → suppressed (defaultPrevented=false)
- Reload with collapsed state persisted → restores without flash
- Mobile simulation (matchMedia returns false for min-width:641px):
same-active-rail click is no-op, Cmd+B is no-op, sidebar stays at 300px
Co-authored-by: jasonjcwu <jasonjcwu@users.noreply.github.com>
Co-authored-by: spektro33 <spektro33@users.noreply.github.com>
Closes#1884Closes#1924
Two follow-ups from Opus pre-release review of stage-336:
1. tests/conftest.py — autouse session fixture that removes
HERMES_WEBUI_SKIP_ONBOARDING from os.environ for the whole pytest run, and
restores it after. Hosting providers and isolated harnesses set this var
to short-circuit the onboarding wizard, but it leaked into pytest and
caused tests that exercise apply_onboarding_setup() to fail with cryptic
FileNotFoundError. Tests that specifically validate the short-circuit
behavior can opt back in with monkeypatch.setenv. Surgical per-test
delenv calls remain as defense-in-depth but are now redundant.
2. docs/rfcs/README.md — one-line note that first-time contributor RFCs
should be discussed in an issue before opening a PR. Gates drive-by
design-doc PRs without us having to decline them on contribution.
Verified: 96 onboarding-related tests pass with HERMES_WEBUI_SKIP_ONBOARDING=1
exported in the test runner env (would have failed before this fixture).
1. test_issue1362_codex_oauth_onboarding.py::test_anthropic_onboarding_setup_allows_linked_oauth_without_api_key
Pre-existing env-collision bug, surfaced when HERMES_WEBUI_SKIP_ONBOARDING=1
is in the test runner env (set by hosting providers and by isolated test
harnesses). `apply_onboarding_setup()` short-circuits without writing the
config file when SKIP_ONBOARDING is set, but the test asserts the file was
written, so it fails with FileNotFoundError on read_text().
Fix: `monkeypatch.delenv("HERMES_WEBUI_SKIP_ONBOARDING", raising=False)` —
matches the convention already used in test_issue1499_keyless_onboarding.py
and test_issue1500_lmstudio_env_var_alignment.py.
2. test_issue1800_file_html_interactions.py::test_media_html_inline_keeps_csp_sandbox
Slicing-based source-string assertion (4000-char window after `def _handle_media`)
broke because PR #2044's MEDIA_ALLOWED_ROOTS parsing was inserted earlier in
the function and pushed the CSP block to offset 4211. Widened window to 5000.
Assertion content is structural (CSP sandbox string present), not positional.
The /api/media endpoint only serves files from ~/.hermes, /tmp, and the
active workspace. Power users with media in custom directories (models,
Downloads, Pictures, ComfyUI outputs) have no way to serve those files
inline without copying or symlinking.
Add MEDIA_ALLOWED_ROOTS env var — a colon-separated list of absolute
paths — that extends the allowed roots at runtime. Each entry is resolved
and validated as an existing directory before being appended. Non-existent
or invalid paths are silently skipped.
This is purely additive: the built-in security whitelist is unchanged,
and if MEDIA_ALLOWED_ROOTS is unset, behavior is identical to before.
Two concrete data-corruption vectors flagged in Opus review of PR #2041,
both fixed atomically so the new repair-safe endpoint is safe for production:
1. Shared tmp filename under concurrent calls
`tmp = target.with_suffix('.json.reconcile.tmp')` produced a fixed path
per session ID. Two simultaneous repair-safe POSTs would interleave bytes
in the same tmp file, then both rename → corrupted JSON. Now matches the
`Session.save()` convention at api/models.py:484 with a pid+tid suffix.
2. TOCTOU between target.exists() check and tmp.replace(target)
`os.replace()` overwrites unconditionally. If a concurrent Session.save()
for the same SID materialized the live sidecar in the microsecond window
between the existence check and the rename, the reconciliation would
silently overwrite a live sidecar with a (lossier) state.db reconstruction.
Switched to `os.link()` + `unlink(tmp)` which is atomic create-or-fail —
on FileExistsError we record `skipped: sidecar_appeared_during_reconcile`
and keep the live sidecar untouched.
Plus a round-trip schema-parity test: materialize a sidecar from state.db,
then load it back through `Session.load()` and assert the messages survive.
Catches future schema drift between `_state_db_row_to_sidecar()` and
`Session.__init__()`. Also adds a guard test confirming the .reconcile.tmp
suffix includes pid+tid (regression guard for hazard #1).
Tests: 23 passing across the recovery suite (was 21; +2 new in this commit).
Co-authored-by: ai-ag2026 <261867348+ai-ag2026@users.noreply.github.com>
Call updateSendBtn after S.activeStreamId is cleared for a new turn and
again after the server returns streamId, since setBusy(true) already
refreshed the button while activeStreamId was still null.
Add regression tests in test_1062_busy_input_modes (TestBusySendButton).
nesquena-hermes