feat(ui): WebUI modernization PR4 — completion keyboard nav, attachments, sidebar

[jkyberneees]

feat(ui): WebUI modernization PR4 — completion keyboard nav, attachments, sidebar

Fourth PR of the WebUI modernization roadmap (Phase 2c + 2d). Stacked on
#111 (feat/webui-modernization-3).

Input & @-completion (2c):

• ArrowUp/ArrowDown move the selection (with wrap-around), Enter/Tab
  accept, Esc dismisses. Previously mouse-only with Tab-to-accept, and
  Enter would send the prompt even with the popup open.
• role="listbox"/role="option" + aria-selected kept in sync for keyboard,
  mouse, and hover selection.
• Attachments: per-file error chips (oversized/unreadable/over the 10 MB
  total cap) that dismiss on click or after 6s, replacing toast-only
  errors; total-size meter ("1.2 MB / 10 MB", amber when above 8 MB)
  rendered next to the chips.

Sessions sidebar (2d):

• Session items restructured: the whole body is a real
  (keyboard-focusable, Enter opens) with separate real rename/delete
  buttons. Row actions now reveal on hover, focus-within, and always on
  touch devices (hover: none) - they were hover-only and unreachable by
  keyboard/touch.
• Rename is an inline edit in the task label (Enter commits, Esc cancels,
  blur commits) - window.prompt() is gone.
• Incremental list updates: loadSessions runs after every turn and used
  to re-render the whole list (stealing scroll position and hover state);
  it now skips the re-render when the session signature is unchanged and
  only syncs the active marker.
• Skeleton rows while the list loads on cold start.

Verified: node --check, go vet, full cmd/odek test suite.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	odek	7cee1d5	Commit Preview URL Branch Preview URL	Jul 26 2026, 12:46 PM

[jkyberneees]

Superseded: this stacked chain was merged directly into main (merge commit 9ae5e46), together with #109. All changes from this PR are on main.