Bake-off 2A: Reproduce the target in Floem

[danielmrdev]

Parent

Part of #49.

What to build

Reproduce the approved Editorial Paper target in a disposable Floem prototype while preserving the current application and tested Rust domain. A writer can interact with the representative Writing surface, Document selector, Settings, and integrated titlebar closely enough to judge visual fidelity, interaction quality, and development cost.

Acceptance criteria

• The prototype matches the approved content, dimensions, tokens, Themes, and states rather than merely restyling the current screenshots.
• Paper and Ink, normal and narrow sizes, Document selector search/results/empty states, and General/Appearance Settings states are directly demoable.
• The integrated themed titlebar supports drag, double-click maximize/restore, minimize, maximize, close, focus, inactive, scaled, keyboard, and accessible-name states.
• Selection, clipboard, undo/redo, IME, soft wrap, scroll, expected shortcuts, App scale, and 1/10 MiB Documents remain directly testable through the real Floem editor.
• Simulated data is isolated from production Documents, Files, autosave, Preferences, and Typeface delivery.
• Implementation and debugging stop at the two-day candidate budget.
• Time, framework-specific code, dependencies, local patches, workarounds, edit-preview cycle, and known platform limitations are recorded as evidence.
• The working application remains intact and no prototype change is presented as production-ready.

Blocked by

• Bake-off 1: Approve Editorial Paper golden screens #50

Workspace

• Mode: parallel lane
• Branch: feat/49-ui-stack-bakeoff-51
• Worktree: /home/daniel/Projects/lettera/.worktrees/feat-49-ui-stack-bakeoff-51
• Integrates into: feat/49-ui-stack-bakeoff
• Remote policy: local only — never push
• Completion: when unblocked, create the lane from the latest integration commit; validate it, merge it locally into integration with approval, validate integration, remove the lane worktree, and delete the local lane branch

[danielmrdev]

Delivered: disposable Floem prototype merged into feat/49-ui-stack-bakeoff at 8c0c5e3 (+ 774217a for #52). Lane worktree and local branch removed.

Artifacts

• prototypes/floem/ — Cargo crate, src/main.rs (~1,150 LOC), README.
• Run: cargo run (needs the vendored floem stack, same system libs as the app).

What it reproduces (golden screens)

• Integrated themed titlebar: drag + double-click maximize (built-in drag_window_area), minimize/maximize/close via floem::action, focused/inactive/hover states, 46×36 hit targets.
• Writing surface: Paper/Ink palettes from the golden spec, active-line highlight, bar cursor, themed selection, bold first-line, letter spacing, Comfortable column, scrollbar on overflow at the column edge.
• Document selector: search filter over the 8-card catalog, hover + keyboard-selected cards, active File mark, loading/empty/no-results/scan-error states, New Draft, Escape/overlay close, focus on search.
• Settings: Appearance sidebar, Theme/Writing width/Letter spacing applying live (editor styling is signal-driven, no rebuild), Typeface rows with Downloading/Failed+Retry, Font size stepper, weights, disabled title-weight + persistence-error states.

Verified (live on this machine, grim captures)

• Window opens undecorated at 1280×800; Paper and Ink both render with the correct tokens (sampled pixels match #1C1B1A / text #2B2722).
• Ctrl+P opens the selector with the 8 cards; F1–F4 cycle loading/empty/no-results/error; Escape closes.
• Ctrl+, opens Settings; Shift+F1–F4 cycle the demo states.
• Ctrl+N clears to an empty Draft (titlebar shows Untitled); Ctrl+Shift+T toggles theme.
• Keyboard map and evidence notes in prototypes/floem/README.md.

Known limitations

• Modal focus trap is partial (search input focused on open, Escape closes; full trap pending).
• No wrap container in floem 0.2: the card grid is built in fixed rows of four.
• Weights selects render the label only (no popup) — visual state present, menu not implemented.
• Implementation time this session ≈ 2.5 h including API discovery; debug binary ≈ 400 MiB (dev profile).