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Austin Pickett ac76bbe21f fix(desktop): triage batch of GUI quality-of-life fixes (#37536 )

* fix(desktop): triage 24 GUI quality-of-life fixes across sidebar, composer, tool cards, messaging, and platform plumbing

A grab-bag of high-leverage UX fixes plus a few backend touches that the
GUI needs to behave correctly on Windows.

Sidebar / sessions
- Decrement $sessionsTotal on delete + archive so "Load N more" stops
claiming removed rows are still on the server.
- Hide the "Group by workspace" toggle when no unpinned sessions exist.
- Accept Cmd/Ctrl+N as a "new session" accelerator (in addition to bare
Shift+N), and render the kbd hint per-platform.
- Switch the statusbar to overflow-x-clip so untitled sessions don't
paint a horizontal scrollbar at the bottom of the window.

Messaging + Cron
- Add [-webkit-app-region: no-drag] to the page-search input so clicks
reach the field instead of routing to the OS window-drag handler.
- Replace single-letter PlatformAvatar with brand glyphs from
@icons-pack/react-simple-icons (telegram, discord, matrix, signal,
whatsapp, mattermost, wechat, qq, ...). Letter monogram fallback for
Slack / Dingtalk / Feishu / WeCom (removed from Simple Icons at brand
owner request).
- Drop the duplicate "Create first cron" button in the empty state.

Composer
- Dedupe pasted images by (name, size, lastModified, type) instead of
Blob identity; Chromium hands us the same screenshot via both
clipboard.items and clipboard.files with fresh File instances.
- Enable spellcheck on the contentEditable, configure Chromium's
spellchecker with the system locale on whenReady, and add
replaceMisspelling + "Add to dictionary" entries to the context menu.
- Render user messages through a minimal markdown pipeline (inline
backtick code + fenced ``` blocks) while keeping @file:/@image:
directive chips intact.
- max-h-[60vh] overflow-y-auto + collisionPadding on the prompt-snippet
submenu.
- Bake cursor-pointer into the <Button> primitive (with
disabled:cursor-default) and into titlebarButtonClass.

Dialogs + tabs + version
- Default DialogContent now has max-h-[85vh] overflow-y-auto so long
bodies scroll instead of falling off-screen.
- Right-rail preview tabs close on middle-click (button === 1), with an
onMouseDown swallow to suppress Chromium autoscroll.
- New refreshDesktopVersion() helper called from About mount, after
every update check, and on throttled window focus so About reflects
the just-installed binary.

Keys + Artifacts + Terminal
- Drop the global "Show advanced" toggle in KeysSettings. Provider
groups now default-expand when they have any key set.
- Extend openExternalUrl to handle file:// via shell.openPath, with
showItemInFolder fallback when the OS can't open the file.
- New lib/ansi.ts SGR parser + <AnsiText> component, applied to
terminal/execute_code tool output.
- ToolView gained stdout / stderr / rendersAnsi; tool-fallback renders
the two streams as separate labeled blocks with stderr in a neutral
tone (not destructive — many CLIs log info on stderr).
- Drop 'stderr' from ERROR_MSG_KEYS in tool-result-summary.

Paths + platform
- resolveHermesCwd skips process.cwd() when packaged and prefers a
user-configurable default project directory.
- New hermes:setting:defaultProjectDir:{get,set,pick} IPC handlers +
preload bridge + global.d.ts typing + a "Default project directory"
row in Sessions settings.
- FileOperations.delete_path(path, recursive=True) on the abstract
base; ShellFileOperations.delete_file rewritten to run a cross-
platform python3 -c snippet so deletes work on Windows shells (which
have no rm/rm -rf). Fallback to `python` when `python3` isn't on PATH.
- README troubleshooting block split into macOS/Linux + Windows
PowerShell recipes.
- Tightened renderer favicon links in index.html + added color-scheme
and theme-color meta.

Backend lifecycle (renderer-side mitigation)
- New noteSessionActivity() heartbeat + session.ts watchdog: an
8-minute silence on the stream auto-clears stuck $workingSessionIds
entries so "Session Busy" never gets permanently wedged. Wired into
useSessionStateCache so every state update refreshes the timer.

i18n spike
- docs/desktop-i18n-rfc.md scoping a future language-switcher PR
(recommends react-intl, audits IME/RTL/CJK in the composer +
chat bubbles, 4-PR rollout plan, ~3-4 eng-weeks for the first
non-English locale).