refactor(gui): converge the visual system onto AppKit's metrics

[AprilNEA]

Summary

The GUI's design tokens described a system the values never actually delivered:
one token (surface_hover) covered three unrelated jobs, hover states had
drifted into four dialects, ~20 hand-painted controls were reachable by mouse
only, and the type ramp ran a rung larger and heavier than AppKit's, which is
most of what "the UI looks rough" meant — it read as a web page rather than a
Mac app.

Three commits, separable and independently revertible: converge the colour
layer and back the window with a native material; take the type ramp and chrome
down to AppKit's own metrics; then a handful of fixes that fell out of
measuring the result.

Two real defects surfaced while doing it, both pre-existing on master:

• A stale agent was reported as unreachable. The handshake already knew which
  side was old (agent=13 gui=16 was in the log), but an older agent was folded
  into ConnectFailure::Unreachable, so the window advised "try reinstalling
  the app" while the socket was answering fine and the actual fix was to let the
  new agent take over.
• moon.svg was on disk but absent from ACTION_ICONS, so Action::Sleep's
  icon silently failed to load in the binding picker — AppAssets::load only
  consults that table.

Changes

crates/openlogi-gui — colour tokens

• Replace surface_hover with one neutral interaction wash at two strengths,
  wash / wash_strong. Both are alpha tints of the foreground, so they
  composite correctly over any surface instead of matching exactly one.
• Add text_ghost (decorative marks) and border_strong (an emphasised edge).
  Call sites were reaching for text_muted — a text weight — in their place.
• WashStyle::hover_wash puts the hover decision in one place, alongside the
  existing SelectableStyle.
• Leader lines were a hardcoded grey authored for the dark theme and nearly
  invisible on light; they now resolve the palette at paint time, so an
  appearance flip repaints them.

crates/openlogi-gui — macOS window material

• The main window opts into WindowBackgroundAppearance::Blurred, and
  platform::os::configure_window_material retargets the NSVisualEffectView
  gpui installs beneath its Metal layer at WindowBackground.
• gpui's BlurredView strips the material's desktop tinting and saturation, so
  the colour comes from the GPUI side: Palette::backdrop is the theme
  background at BACKDROP_ALPHA (0.8) — a single translucent layer, with
  everything above it opaque so no two translucent surfaces stack.
• New macOS-only dependency raw-window-handle (target-gated) to reach gpui's
  NSView. It is the version already in Cargo.lock as gpui's own dependency,
  so the resolve adds an edge, not a crate; both git pins are unchanged.

crates/openlogi-gui — control affordances

• ControlStyle::control gives a hand-painted div a native cursor, a tab stop
  and a focus ring; press_wash is the pressed state. Applied to the ~20
  clickable surfaces that had none of it, and cursor_pointer (a web idiom) is
  gone from the crate.
• Activation needed no wiring: gpui already maps enter/space to a focused
  element's click listeners and keeps the focus handle in element state under
  the element's id.
• The focus ring is drawn as an outer shadow rather than a border, which would
  resize the element on focus and reflow tight rows.
• Fixes en route: the mouse and keyboard key chips hovered darker than their
  resting state, and a delete affordance hovered to gpui::white(), vanishing
  on a light theme.

crates/openlogi-gui — type ramp and chrome

• The ramp now is AppKit's text styles — title1 22, title2 17, headline/body
  13, subheadline 11 — and weight stops at SEMIBOLD, leaving hierarchy to the
  colour ramp. Leading ratios are deliberately unchanged: native chrome is small
  text with roomy leading, so density comes from the size, not from crowding.
• Header 80 → 56, footer 50 → 34, and one notch off each spacing token.
• Both *_VERTICAL_RESERVE constants are now derived from those values instead
  of a 224px literal, so the reclaimed height goes to the device model rather
  than staying budgeted for chrome that shrank. The window's minimum height
  follows the same arithmetic down to 640, and the pointer grid keeps its exact
  two-card fit at the 720px minimum by taking the 8px the narrower inset frees.
• Card radius × 1.5 → × 2: at the theme's 6px control radius that moves
  cards from 9 to 12, far enough from the controls inside them that the nesting
  reads.

crates/openlogi-gui — agent-link state, assets, motion

• AgentLink::OutdatedAgent mirrors the OutdatedGui state that already
  existed, with its own frame and the same retry cadence. No wire change: the
  version comparison was already there, only its reporting was lossy.
• Register moon.svg, and add the test that would have caught it — the
  action-icons/ directory and ACTION_ICONS must agree. include_bytes!
  already covers the opposite direction and ActionRingIcon::ALL covers the
  enum-driven icons; a file nobody registered was the uncovered case.
• set_reduce_motion was never called, so gpui's flag sat at its default and
  animations ran regardless of the system preference. Wired to NSWorkspace on
  macOS and GSettings on Linux, before the first window opens.
• Tooltips for the two controls that had no accessible name at all: the
  carousel's prev/next chevrons and the DPI preset's remove button. The other
  icon buttons already carry visible labels.

i18n

Five new keys across all 20 locales (403 each, order-identical). Non-English
values are best-effort pending Crowdin, per the locale rules.

crates/openlogi-gui/src/platform/AGENTS.md

Bring the FFI inventory back in sync with the tree it documents: add os.rs and
overlay.rs, and correct the two tray paths that moved to crates/openlogi-agent.

Testing

cargo fmt --all -- --check          # clean
cargo clippy --workspace --all-targets -- -D warnings   # clean
cargo test --workspace              # 25 test binaries, no failures
cargo test -p openlogi-gui i18n     # locale parity, 403 keys

Run on the rebased tip. One caveat worth recording: the first post-rebase run
showed three xtask bundle-plist failures that turned out to be a stale test
binary cached from a since-deleted sibling worktree (its CARGO_MANIFEST_DIR
was baked in); cargo clean -p xtask and they pass 20/20. Nothing in this
branch was involved.

Exercised in the running dev app against the mock agent (openlogi-agent-mock):
window opens, connects, polls, and quits cleanly with no panics or unexpected
warnings. Not runtime-tested on hardware — no physical device was attached,
and every device shown came from the mock.

Two things this branch changes that were not visually verified by the author
and are worth a look during review:

• the resulting Tab order, now that ~20 hand-painted controls joined the cycle
  alongside the framework buttons; and
• the AgentLink::OutdatedAgent frame, which needs a deliberately stale agent
  to trigger.

Fixes #567

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[greptile-apps]

Greptile Summary

The PR aligns the GUI’s visual system with AppKit metrics and improves native accessibility behavior.

• Consolidates palette, typography, spacing, window-material, and control-affordance behavior
• Adds explicit stale-agent status handling and associated localized messaging
• Initializes the operating system’s reduced-motion preference before creating the first window
• Registers the missing sleep icon and adds asset-table coverage

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/openlogi-gui/src/ipc_client.rs	Adds a distinct older-agent connection outcome and now prevents the generic unreachable notification from overwriting the specialized frame while the mismatch persists.
crates/openlogi-gui/src/platform/os.rs	Reads the platform reduced-motion preference synchronously before window creation, resolving the previously reported Linux startup race.
crates/openlogi-gui/src/main.rs	Initializes reduced-motion state before opening windows and maps the new IPC outcome into the dedicated agent-link state.
crates/openlogi-gui/src/state.rs	Extends the connection-state model with an explicit outdated-agent state for accurate recovery guidance.
crates/openlogi-gui/src/theme.rs	Revises visual tokens, typography, spacing, and reusable interaction styles to match the new AppKit-oriented system.

_{Reviews (2): Last reviewed commit: "fix(gui): keep a protocol-mismatch frame..." | Re-trigger Greptile}