* fix(desktop): prevent sidebar section overlap
Use a shared sidebar section scroller only on short windows so sections do not overlap, while preserving per-section scrolling on taller layouts.
* fix(desktop): measure section stack for compact sidebar mode
Window-height media query kept big windows in compact mode whenever the OS chrome ate into 830px; observe the section stack element instead so compact only engages when the stack is actually short.
* refactor(desktop): drive sidebar compact mode with CSS, not JS
Replace the matchMedia hook with a `short` (max-height: 830px) Tailwind
variant so the per-section scrollers flatten into one shared scroll stack on
short windows purely in CSS. Taller windows keep their per-group scrollers and
recents virtualization unchanged.
* refactor(desktop): pure-CSS two-mode sidebar scroll + collapse/cap groups
Drop the JS-measured compaction in favour of a single `compact` height
variant (max-height: 768px):
- tall: every section is its own capped, independent scroller; Sessions
is the lone flex-1 scroller.
- short: sections flatten and the stack scrolls as one.
Every section is now `shrink-0`, so nothing is squeezed below its
content and bled onto a sibling — the root cause of the header overlap
(flexbox implied min-size). Sessions keeps its virtualized scroller in
short mode only when it's the long list.
Non-session groups (messaging, cron) collapse by default — expanded ids
persist per platform — and render 3 rows, revealing 10 more on demand.
Extract the shared SidebarLoadMoreRow. Stress harness seeds 50 recents
to mirror the real first page.
* chore(desktop): trim sidebar comments, unify "compact" naming
Self-review polish: condense the over-long mode comments, use "compact"
consistently (matching the variant) instead of mixing "short", and drop a
no-op useCallback around revealMoreMessaging.
* chore(desktop): drop dev sidebar stress harness from the PR
Remove stress-probe.ts and its main.tsx import — it was a throwaway
testing aid, not something to ship.
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