---
name: handover-2026-04-19
type: reference
tags: [handover, session, lumotia]
description: Session handover — 2026/04/19 dogfood polish + cross-platform window chrome
---

# Lumotia Handover — 2026/04/19

*Originally written when the product was named Kon (and briefly Corbie); references rewritten in the 2026-04-30 rebrand sweep.*

Second dogfood sprint. Four phases: (1) fix bugs surfaced on first real use, (2) redesign History for cognitive-load hygiene, (3) resolve broken window resize/drag on Linux Wayland, (4) clean up microphone picker.

## What shipped this session

### Cross-window preferences sync
- `preferences.svelte.js` emits `lumotia:preferences-changed` Tauri event on update.
- Main / viewer / float layouts listen and call `applyExternalPreferences` without re-emit, so theme and font changes propagate live across sibling windows.
- Echo suppressed via source window label check.

### Hotkey recorder
- Root cause of "can't change hotkey": button-level `onkeydown` relied on post-click keyboard focus, which webkit2gtk on Linux does not guarantee.
- Fix: `document.addEventListener("keydown", ..., { capture: true })` inside a `$effect` gated by `recording`. Beats any descendant handler. Escape now cancels.

### History page redesign (research-backed)
- Compact row now shows the **title** (or "Untitled"), not body-preview text — metadata already lives in the row columns (date, duration, source icon).
- Expanded row gets an inline title input (replaces the old Rename prompt modal).
- **Edit** button opens the viewer window in `edit` mode (editable textarea, debounced save to localStorage + storage-event sync back to main history).
- **Export .md** copies a full YAML-frontmatter markdown document to the clipboard — paste into Obsidian.
- **Tags**: `$lib/utils/frontmatter.js` exposes `deriveAutoTags` (currently returns `[]`), `buildFrontmatter`, `serialiseFrontmatter`, `buildMarkdown`. Manual tags stored as `item.manualTags`, rendered as removable chips in the expanded row with `+ add tag` input.
- Header tag chip bar (cap 7, click to filter, × to clear), plus `tag:xyz` search syntax.
- Global **Starred** filter toggle in the History header.
- Research memo found all five previous auto-tag families redundant with existing row UI — kept the derivation hook for the post-Task-7 `topic:*` content tag from lumotia-llm.
- Duplicate-transcript render fix: expanded `<p>` only if compact preview actually truncated.

### Viewer / editor popout
- `/viewer` route now reads `lumotia_viewer_mode` from localStorage ("view" | "edit").
- Edit mode renders a plain textarea bound to `item.text`; 400ms debounced save flushes on input, final flush on `onDestroy`. Segment-specific controls (Compact, Starred) hidden in edit mode.
- Native title: **"Lumotia - Transcription Editor"**.

### Platform-aware window chrome (Linux fix)
**Root cause:** Tauri v2 frameless `decorations: false` on KDE Wayland + webkit2gtk does not honour diagonal corner resize (collapses `NorthEast` etc. to a single axis via GTK's `gtk_window_begin_resize_drag`), and `data-tauri-drag-region` adds noticeable drag latency. Setting `setPointerCapture` ahead of `startResizeDragging` does not help once the compositor has taken over the pointer grab. Verified via Context7 docs + Codex diagnosis — Linux frameless is a known-fragile path.

**Fix:**
- Linux uses **native KWin/Mutter decorations**. `src-tauri/tauri.linux.conf.json` overlays `decorations: true` + full main window config (title, sizes) — overlays **replace** the windows array, so every field must be present, not just the delta. `src-tauri/src/commands/windows.rs` uses `cfg!(target_os = "linux")` to set decorations per window.
- macOS / Windows keep custom chrome. `src/lib/utils/osInfo.js` `isLinux()` gates `<Titlebar>` and `<ResizeHandles>` via `useCustomChrome = $state(false)`; flips to `!isLinux()` after `loadOsInfo()` resolves.
- Dueling drag-region handlers removed across Titlebar, float page, viewer page — everywhere a manual `startDragging()` lives, the `data-tauri-drag-region` attribute was deleted (they're alternatives per Tauri docs, not combinable).
- `ResizeHandles` kept for macOS/Windows frameless: 12 px edges / 20 px corners via CSS vars (`--lumotia-resize-edge`, `--lumotia-resize-corner`), `pointerdown` + `setPointerCapture`, corners with explicit higher z-index. Handles rendered as siblings of the animated layout div so `position: fixed` is viewport-relative rather than captured by the transform containing block.

### Window minimum sizes (evidence-backed)
Research pass cited GNOME HIG (1024×600 desktop / 360×294 mobile floors), WCAG 2.2 SC 1.4.10 Reflow (320 CSS px), Raycast 750×474 as a reference for single-pane working width, and consistent A11y principle that nothing should clip in the default configuration.

| Window | Was | Now | Rationale |
|---|---|---|---|
| Main | 1020×540 | **960×600** | Fits 210 px sidebar + ~750 px content; GNOME vertical floor. |
| Float | 400×400 | **360×480** | 360 = GNOME mobile floor; 480 fits pills + quick-add + sort + ~6 task rows without scroll. |
| Transcript editor | 450×500 | **560×520** | Exceeds WCAG reflow floor; ~60-70 char measure for editing. |

### Microphone picker cleanup
- ALSA enumeration was leaking `hw:`, `plughw:`, `front:`, `sysdefault:`, `null` et al into the dropdown.
- `SettingsPage.svelte` now renders only sentinel devices (`default`, `pipewire`, `pulse`) + one entry per unique sound card, keyed off the `sysdefault:CARD=X` alias.
- `crates/audio/src/capture.rs` reads `/proc/asound/cards` and populates a new `description` field on `DeviceInfo` with the card's full product string (e.g. "Blue Microphones" for Jake's Yeti). Frontend prefers description → CARD=X short name → raw name.

### GPU reporting
- `commands/models.rs::get_runtime_capabilities` was hardcoded to `accelerators: vec!["cpu"]` and `supports_gpu: false` for whisper. Updated to `["cpu", "vulkan"]` and whisper `supports_gpu: true`, reflecting that `crates/transcription/Cargo.toml` links transcribe-rs with the `whisper-vulkan` feature unconditionally.
- Settings now shows the Vulkan option instead of the "This build is CPU-only" notice.

### Desktop shortcut
- `~/Desktop/Lumotia.desktop` launcher with the 128×128 icon, `Terminal=true` so logs are visible and Ctrl+C cleanly stops the run.sh wrapper.

## What's deferred

- **Transparent windows (`transparent: true`)** — Tauri issue #13270 reports this smooths drag/resize further on Linux, but it's moot now that Linux uses native decorations.
- **File-system export (.md save dialog)** — currently clipboard-only. Needs a Rust `write_text_file` command for plugin-less file writes.
- **Bulk select + bulk export** in History.
- **LLM-powered content tags** (`topic:*`, `intent:*`) — slots into Task 7 `lumotia-llm` stub once Phase 3 wires real llama-cpp-2.
- **Settings UX overhaul** — Jake flagged that current settings feel overwhelming. Proposed: bunch high-traffic settings, hide advanced behind a toggle. Brainstorm + plan deferred to a dedicated session.
- **Task 7 (MicroSteps end-to-end)** — storage + Tauri CRUD + lumotia-llm stub + frontend dual-write all landed in an earlier commit chain. The MicroSteps UI was written as the final task 7 step but not yet dogfooded against the stub LLM. Needs manual walkthrough.

## Gotchas discovered today

| Issue | Fix |
|---|---|
| `tauri.linux.conf.json` stripped title and min sizes from main window | Overlay **replaces** the windows array — include every field, not just the delta |
| `data-tauri-drag-region` + manual `startDragging()` on the same node caused drag latency | Pick one — we use manual `startDragging` for the button/input early-return logic |
| Corner resize collapsed to single axis on KWin Wayland | Native decorations on Linux side-step the whole frameless path |
| `animate-float-enter` on the viewer/float layout root created a containing block that broke `position: fixed` on ResizeHandles children | Render ResizeHandles as a sibling of the animated div, not a descendant |
| Lumotia binary auto-respawned on file-save while a second run.sh was also launching → two visible instances sharing one Vite server | Do not script `./run.sh` while the user has already launched via the desktop icon; rely on HMR |
| `run.sh` leaves `"beforeDevCommand": ""` in tauri.conf.json if its cleanup trap is bypassed (e.g. SIGKILL) | Cleanup trap restores `"npm run dev"` on graceful exit; SIGTERM (not SIGKILL) is the right kill signal |
| `/proc/asound/cards` header lines have leading whitespace for 2-digit card ID alignment | Parser trims leading whitespace before checking for leading digit |

## How to resume

```
Picking up Lumotia dogfooding from 2026/04/19.
HANDOVER is at HANDOVER.md in the project root.
Active priorities: (1) confirm resize/drag/mic cleanup, (2) Task 7 MicroSteps
dogfood with lumotia-llm stub, (3) Settings UX brainstorm.
```
