outliner: add move up/down to editor toolbar

[tiensonqin]

Summary

Adds Move up / Move down actions to the outliner editor toolbar on both hosts (Apple and Flutter), placed right after indent/outdent and wired through the existing PerformOutlinerToolbarAction → outliner-toolbar effect → Toolbar RPC path (moveUp / moveDown wire actions).

Move semantics intentionally mirror logseq's move-blocks-up-down (deps/outliner): contiguous selected roots (or the editing block) reorder within their siblings; at a boundary the selection crosses into the parent's neighbor as its first child — first-child move-up lands in the parent's previous sibling, last-child move-down lands in the parent's next sibling. Root-level edges, mixed-parent, and non-contiguous selections are no-ops (toolbar still emits the haptic, matching indent/outdent).

Also fixes an outdent divergence found while checking parity: logseq's direct outdenting re-parents the moved selection's trailing siblings as children of the last moved block — Outliner_state.outdent now emits those pending_moves too.

The toolbar now relies on scroll-leading pinning: hide-keyboard stays fixed at the trailing edge while the remaining buttons scroll horizontally (LUI change in logseq/lui#57, pinned here as 912829b9 on both Package.swift and pubspec).

New move/toolbar_reorder in outliner_state.ml; new Move_up/Move_down variants in outliner_toolbar; SF Symbols arrow.up/arrow.down and Material arrow_upward/arrow_downward icons; OCaml tests cover sibling reorder, selection preservation, boundary crossing, and no-op edges.

Testing: dune build @shared/native/runtest + @shared/test/runtest — 720 tests pass; verified in iPhone 17 simulator (native simctl recording in review comment).

Link to Devin session: https://app.devin.ai/sessions/e53865e84cdb4e85aad3d7c5b99ba7c9
Open in Devin Desktop: https://app.devin.ai/desktop/session/e53865e84cdb4e85aad3d7c5b99ba7c9?variant=devin
Requested by: @tiensonqin

[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring

[devin-ai-integration]

Manual iOS verification — Move up/down editor toolbar

Verified on iPhone 17 simulator against local db-sync (feature/native-mobile-app), build at 7fa33b8.

Tested on journal fixture A, B[b1, b2], C:

• ↑/↓ buttons render on the editor toolbar after outdent/indent (arrow.up/arrow.down SF Symbols)
• Mid-sibling reorder: B ↑ → above A, ↓ → back; children move along, edit focus kept
• Root edges no-op: ↑ on top block, ↓ on bottom block change nothing
• Boundary crossing matches logseq: first-child ↑ → becomes first child of parent's previous sibling (b1 → under A); last-child ↓ → first child of parent's next sibling (b2 → under C)

Note / possible follow-up

Multi-select (long-press) shows the separate selection toolbar, which has no move buttons — multi-block move is supported in the core but not reachable via toolbar UI. Also, toolbar buttons expose no accessibility names in the iOS AX tree (pre-existing pattern, same for indent/outdent).

[devin-ai-integration]

Manual iOS verification — pinned hideKeyboard + move up/down (lui b4aca63c)

Verified on iPhone 17 simulator against local db-sync. The toolbar now keeps ⌨ pinned at the trailing edge while the rest of the buttons scroll inside the fused capsule.

• ✅ ⌨ capsule pinned at trailing edge in portrait at rest
• ✅ Scrolling the capsule: content scrolls inside (☑…📷 ↔ ↑…[[]]), ⌨ never moves; task ☑ reachable by scrolling back
• ✅ Tapping pinned ⌨ dismisses editing
• ✅ ↑/↓ reorder blocks (incl. boundary crossing into the parent's neighbor)
• ✅ Landscape: full capsule + pinned ⌨

Requires logseq/lui#58 (scrollCapsule fix) — the lui pin here tracks that branch until it lands.