feat(notify): toast notifications with variable-size rendering

Add the in-app notifications system and its toast overlay:

- internal/notify: bounded, mutex-guarded message store backing both the
  toast overlay and the aku-messages synthetic resource. Add dispatches
  its send callback on its own goroutine so it NEVER blocks the Bubble Tea
  Update loop (the unbuffered-channel deadlock fix).
- internal/plugins/notifications: aku-messages resource plugin.
- internal/ui/toaststack: top-right toast stack. Toasts shrink to fit
  their text up to min(40% cols, 60) wide, word-wrap onto up to
  min(30% rows, 6) lines, and truncate with an ellipsis beyond that;
  caps are terminal-proportional and computed per render. Tiny terminals
  render no toast rather than overflow.
- config: notifications block (buffer size, max_visible, per-level
  timeouts); wiring in cmd/root.go; supporting msgs/statusbar changes.

Includes comprehensive toaststack tests (shrink-to-fit, wrap, hard-break,
height floor/ceiling/exact-boundary, proportional caps, size guards) and
a regression guard that Add never blocks.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

feat(terminal): graceful remote shell termination on pane close

Add Terminal.TerminateGracefully: best-effort coax the remote shell to
exit on its own (Ctrl-C then a burst of Ctrl-D to peel nested shells)
before the hard Close(), so pane-close/quit doesn't orphan the shell.
Exposes DefaultGraceTimeout for callers and covers the race with a
concurrent Close().

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs(README): add terminals and contexts section

feat: pane UX fixes — scroll, split placement, move-pane, focus

Four independent fixes in the TUI table/layout layer:

- table: rewrite MoveUp/MoveDown around a minimal-scroll helper
  (scrollToCursor) so the viewport only scrolls when the cursor leaves
  the visible window — pressing up on the last visible row (or down on
  the first) no longer hides that row. Symmetric for both directions.
- layout: AddSplit inserts the new pane at focusIdx+1 instead of
  appending, so a new split lands directly below the focused pane
  (vertical) or to its right (horizontal).
- layout/commands: add MoveFocusedSplit reorder primitive and
  orientation-aware alt+shift+<arrow> move-pane bindings (vertical uses
  up/down, horizontal uses left/right; perpendicular axis is a no-op).
  MoveFocusedSplit releases detail-panel focus like FocusNext/FocusPrev.
- layout: FocusNext/FocusPrev release detail-panel focus before moving
  split focus, so shift+up/down no longer highlights both borders.

Adds unit tests across internal/table, internal/layout, internal/app,
and documents the move-pane binding in README. Build, vet, and the full
test suite pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

feat: save logs by ctrl-s

fix: address code review findings

- Clear pendingRestart/pendingRestartGVR on ctrl+w overlay dismiss and
  reloadAll so a stale rollout-restart pending state cannot mis-route a
  later ConfirmResultMsg into the restart branch.
- Surface a status-bar error when rollout-restart is invoked without a
  k8s client, matching edit/scale/exec.
- Tighten restart_test.go: validate restartedAt with time.Parse instead
  of a "20" prefix, surface NestedStringMap errors, and add an empty-
  targets contract test.
- Strengthen confirm-dispatch tests to assert against the message
  actually stored on the dialog (new ConfirmDialog.Message accessor),
  exercise the cmd returned from ConfirmYes end-to-end against a fake
  dynamic client, verify ClearSelection on ConfirmForce, and add no-
  focused-split / no-objects coverage.
- Cover helm N=1 failure and N=2 partial-failure paths plus the
  portforward unknown-id case in TestExecuteDelete.
- Add buildRestartConfirmMessage coverage for statefulsets/daemonsets
  and trie-scope coverage that R resolves to rollout-restart on
  deployments/statefulsets/daemonsets.
- README operations bullet now reflects deployments/statefulsets/
  daemonsets and multi-select for rollout restart.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

feat(helm): add user values and all values

fix: a bunch of minor issues were fixed

fix: address code review findings

- Prevent latent bufIdx=-1 when hasIndicator is true and di==0
- Use ansi.Cut for display-column slicing in search tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fix: change keybinding desc