desktop: Soft Tactile window shell — floating sidebar, inspector, console drawer, download strip

[plombeer31]

Part of the Soft Tactile desktop redesign. Depends on #440 (base branch facelift/1-foundation); every region PR can merge in any order after it. The integrated build is facelift/integration.

Soft Tactile, window shell (SH-01…09, SH-17, CH-23). Builds on the foundation PR.

What changes

• Toolbar: --well ground, 32px round toggles (on = soft blue tint), "Chat" and the session line on one baseline, a lifted Search pill with one ⌘K keycap. The Electron drag region and the 96px traffic-light gutter stay.
• Sidebar: a floating --lift panel (radius 16, soft shadow) with the workspace chip as a well pill, sentence-case "Tasks · N running · +" and "Chats · +" headers, 34px pill rows. Task rows show their schedule or status word in mono.
• Dots: running pulses brand, waiting for approval and blocked are amber, failed is red, unread is filled brand, read is a hollow ring. chatDot/taskDot gain a third tone element; the first two and every branch are unchanged.
• Settings entry: a neutral full-width button with gear, word and ⌘, keycap, as in the reference. This reverses the r5 item 8 wording ("no keycap hint, no second icon") — say if the plain button should stay.
• Rail and minimum window: dots, the two pluses and the gear; at 940×620 the inspector hides and the sidebar is a rail.
• Inspector: a floating 292px panel, full-width segmented Steps / Reasoning / World, 38px mono step rows with a spinner on the running one, Reasoning as step labels over wells, World as a plate.
• Console: a floating drawer with Agent log / LLM log, a neutral Write Debug Bundle ⌥⌘D button and real empty states (the LLM log says this build does not record model requests there).
• Download strip: a lifted pill with icon, mono model id, progress bar, %, ETA, "N more queued" and Cancel; only the bar, % and ETA repaint per sample.

Tests

• Smoke: the sidebar row height check is 34px, and the Settings button check expects one keycap and a visible gear.

Verified

• Trusted-input driver: every geometry value the smoke reads (row 34px, 6px dots on the label centre, pluses on one edge, 260px open / 52px rail), Settings opens and closes, + starts a chat, hover reveals unread, a step click flashes its card, all inspector and console tabs, strip Cancel with hover held across progress frames.
• Smoke on the merged build: same 4 known failures as a0811bc3.
• model-picks.drive.mjs: its 6 red checks are the same on the foundation commit (Settings › LLM › Local).