feat(fleet-ui): add action sheet overlay

openspec/changes/agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15/.openspec.yaml

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+schema: spec-driven
+created: 2026-05-18

openspec/changes/agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15/proposal.md

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+## Why
+
+- The design-match lane needs a reusable fleet-ui action sheet matching the design-C grouped/cancel surface so later integration can open destructive or contextual pane actions without editing the overlay monolith.
+
+## What Changes
+
+- Adds `fleet_ui::action_sheet_overlay` with grouped action rows, warning/destructive tones, selected-row state, bottom anchoring, a separate cancel card, hairline dividers, and a focused inline snapshot test.
+- Exports the module from `fleet-ui/src/lib.rs`.
+
+## Impact
+
+- Affects only the shared `fleet-ui` crate. The new module is not wired into runtime binaries in this lane.
+- Verification: `RUSTC_WRAPPER= cargo test -p fleet-ui --lib`.

openspec/changes/agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15/specs/design-c-port-action-sheet-overlay/spec.md

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+## ADDED Requirements
+
+### Requirement: Reusable Design-C Action Sheet
+The `fleet-ui` crate SHALL expose a reusable action sheet overlay module for grouped contextual actions.
+
+#### Scenario: Rendering grouped actions
+- **WHEN** an `ActionSheet` is rendered with one or more `ActionGroup` values
+- **THEN** the sheet is bottom anchored inside the provided frame
+- **AND** action rows are separated by hairline dividers
+- **AND** the cancel action is rendered in a separate card below the action group.
+
+#### Scenario: Rendering destructive and selected actions
+- **WHEN** an action item is marked destructive
+- **THEN** the item uses the iOS destructive red treatment.
+- **WHEN** an action row or cancel row is selected
+- **THEN** the selected surface uses the iOS tint treatment without changing row height.

openspec/changes/agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15/tasks.md

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+## Definition of Done
+
+This change is complete only when **all** of the following are true:
+
+- Every checkbox below is checked.
+- The agent branch reaches `MERGED` state on `origin` and the PR URL + state are recorded in the completion handoff.
+- If any step blocks (test failure, conflict, ambiguous result), append a `BLOCKED:` line under section 4 explaining the blocker and **STOP**. Do not tick remaining cleanup boxes; do not silently skip the cleanup pipeline.
+
+## Handoff
+
+- Handoff: change=`agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15`; branch=`agent/codex/design-c-port-action-sheet-overlay-2026-05-18-14-15`; scope=`fleet-ui action_sheet_overlay`; action=`finish cleanup after PR merge`.
+- Copy prompt: Continue `agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15` on branch `agent/codex/design-c-port-action-sheet-overlay-2026-05-18-14-15`. Work inside the existing sandbox, review `openspec/changes/agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15/tasks.md`, continue from the current state instead of creating a new sandbox, and when the work is done run `gx branch finish --branch agent/codex/design-c-port-action-sheet-overlay-2026-05-18-14-15 --base main --via-pr --cleanup`.
+
+## 1. Specification
+
+- [x] 1.1 Finalize proposal scope and acceptance criteria for `agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15`.
+- [x] 1.2 Define normative requirements in `specs/design-c-port-action-sheet-overlay/spec.md`.
+
+## 2. Implementation
+
+- [x] 2.1 Implement scoped behavior changes.
+- [x] 2.2 Add/update focused regression coverage.
+
+## 3. Verification
+
+- [x] 3.1 Run targeted project verification commands: `RUSTC_WRAPPER= cargo test -p fleet-ui --lib`.
+- [x] 3.2 Run `openspec validate agent-codex-design-c-port-action-sheet-overlay-2026-05-18-14-15 --type change --strict`.
+- [x] 3.3 Run `openspec validate --specs`.
+
+## 4. Cleanup (mandatory; run before claiming completion)
+
+- [ ] 4.1 Run the cleanup pipeline: `gx branch finish --branch agent/<your-name>/<branch-slug> --base dev --via-pr --wait-for-merge --cleanup`. This handles commit -> push -> PR create -> merge wait -> worktree prune in one invocation.
+- [ ] 4.2 Record the PR URL and final merge state (`MERGED`) in the completion handoff.
+- [ ] 4.3 Confirm the sandbox worktree is gone (`git worktree list` no longer shows the agent path; `git branch -a` shows no surviving local/remote refs for the branch).