feat(fleet-tui-poc): full iOS design (Spotlight + context menu + action sheet + session switcher) (#8)

* feat(fleet-tui-poc): full iOS design implementation (Spotlight, context menu, action sheet, session switcher)

Implements the design at api.anthropic.com/v1/design/h/MnT9tqrbyJornGQ6jFA3mA
(README in /tmp/design/terminal-ios-style/), extending the bare-bones POC
into a full ratatui mockup of all four iOS surfaces:

  * Spotlight palette — search-first, Top Hit pill (IOS_TINT #0a84ff bg,
    white bold, tmux·h badge), grouped sections (PANE / SESSION / FLEET)
    with 30×30 icon tiles, footer `↵ open · ⌥↵ in all panes · esc cancel`
  * iOS context menu — pinned long-press menu, sectioned with hairlines,
    destructive-red Kill row, ▭ pane / %id title bar with green live dot
  * Action sheet — bottom-anchored grouped sheet with iOS Cancel hallmark
  * Session switcher — app-switcher cards (one per codex worker) with
    Focus/Queue/Pause/Kill action row

Press 1/2/3/4 to switch overlays, q to quit.

Palette: iOS dark UIKit values match the design's GLASS object —
IOS_TINT = Rgb(10,132,255), IOS_DESTRUCTIVE = Rgb(255,69,58),
IOS_GREEN = Rgb(48,209,88), IOS_ORANGE = Rgb(255,159,10),
IOS_FG = Rgb(242,242,247). Fonts default to terminal monospace.

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

* feat(fleet-tui-poc): session-switcher buttons are now clickable

Adds App.card_buttons hit-test registry. render_session_card pushes a
Rect for each Focus / Queue / Pause / Kill button per card; the New
worker pill registers as a NewWorker action. On MouseDown(Left) inside
SessionSwitcher the App.dispatch_card_click walks the registry and
sets App.last_action with a human-readable line ("✓ Focus → pane 1
(would: tmux select-pane -t codex-fleet:overview.1)") that flashes in
the footer area until the next click.

Card sizing also tightened: strip height now caps at 70% of the
available vertical space and centers between header and footer,
matching artboard D in /tmp/design/terminal-ios-style/project/
palettes.jsx (artboard shows ~78%; we leave 8% for the flash row).
card_w 30→28 + gap 2→1 so a wider set of cards fits in modest kitty
sizes.

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

---------

Co-authored-by: NagyVikt <nagy.viktordp@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

rust/fleet-tui-poc/README.md

@@ -38,12 +38,24 @@ the surrounding iOS chrome side-by-side):
 tmux split-window -h -t codex-fleet:overview "cd $(pwd) && cargo run --release"
 ```
 
-Press `q` or `Esc` to exit.
+## Keys
 
-## Expected output
+| Key       | View                                                        |
+|-----------|-------------------------------------------------------------|
+| `0`, Esc  | Phase-0 validation harness (chip + event log) — the default |
+| `1`       | iOS context menu over codex multi-pane backdrop             |
+| `2`       | iOS spotlight palette over codex multi-pane backdrop        |
+| `3`       | iOS action sheet over codex multi-pane backdrop             |
+| `4`       | iOS session switcher (full-screen)                          |
+| `q`       | Quit                                                        |
+
+`0`/`Esc` from any overlay returns to the harness; from the harness it
+quits.
+
+## Expected output (default view)
 
 ```
-╭ ◆  fleet-tui-poc  (press q to quit) ───────────────────────────────╮
+╭ ◆  fleet-tui-poc  (1·2·3·4 palettes  ·  q quit) ────────────────────╮
 │ ◖ ●   working   ◗                                                   │
 │ click the chip; coords appear below. expect ✓ ON CHIP when…         │
 │   (12, 4)  Down(Left)  ✓ ON CHIP                                    │
@@ -55,6 +67,27 @@ Press `q` or `Esc` to exit.
 The chip should look identical to the `[ working ]`-style chips that
 `fleet-tick.sh` renders elsewhere — same hue, same caps.
 
+## iOS palette previews (keys 1–4)
+
+Each palette is a ratatui port of an artboard from the
+`terminal-ios-style` design handoff (Claude Design, 2026-05-14). They
+preview the surfaces Phase 5 of the openspec change owns
+(`overlay.rs`), so the visual feasibility is checked before
+`fleet-ui` scaffolds.
+
+- **1 · Context menu** — UIKit long-press menu pinned to the active
+  pane. Five sections (copy / search / split / swap / lifecycle),
+  destructive Kill in `IOS_DESTRUCTIVE`, shortcut chips on the right.
+- **2 · Spotlight** — search-first palette. Query line + systemBlue
+  Top-Hit bar + three grouped result lists (Pane / Session / Fleet)
+  with monospace shortcut chips.
+- **3 · Action sheet** — bottom-anchored grouped sheet with a
+  separate `Cancel` button — the iOS hallmark — in `IOS_TINT`.
+- **4 · Session switcher** — app-switcher-style cards, one per codex
+  worker. Active worker has the systemBlue border + LIVE badge; per
+  card shows pane status, task, model · context · runtime, and a row
+  of Focus / Queue / Pause / Kill actions.
+
 ## What "validated" looks like
 
 When the operator runs this and confirms in the OpenSpec change's