feat(panel): persist the panel size and fix the divider drag without a terminal

[eugenioenko]

Why

The bottom panel height and the right-docked panel width reset on every launch, while the sidebar and commit history sizes are already restored from state.json.

Change

• state.json gains panelHeight and panelWidth, stored separately since the two docks are not interchangeable. Saved once when a divider drag ends (the OnResizeEnd hook from fix(sidebar): restore closed state and a usable width on launch #678) and by View: Increase/Decrease Panel Size; restored at startup. The fullscreen terminal toggle does not save, so a full-height terminal is not remembered as your size.
• New minimums, ui.MinPanelHeight = 5 (divider, tab bar, and three content rows, the same rule as changesHistoryMinHeight) and ui.MinPanelWidth = 30. You can still drag below them or close the panel, but those sizes are not saved or restored, and reopening resets them to a usable size (previously only a height of 1 or less was reset, and width never was). The three copies of that reopen logic are folded into ensureUsablePanelSize.
• Open/closed state and the active tab are intentionally not persisted: restoring the panel open would start a shell on every launch.
• The settings reference now lists the panel among the layout saved to state.json.

Tests

Unit tests in internal/app:

• TestPanelSizeRestoresAndPersists: sizes round-trip through a rebuild, sizes under the minimums are not saved, and saved sizes under the minimums are not restored.
• TestReopeningTinyPanelResetsSize: reopening after a tiny drag resets height to half the area and width to the default.

The save-on-release contract of ContentSplitWidget.OnResizeEnd is covered by TestCommitHistoryDragPersistsOnlyOnRelease from #678.

Exercised in the real binary with an isolated TTT_CONFIG_DIR:

• Drag the bottom divider up 6 rows: {"panelHeight":21,...}; the next launch opens at 21.
• Drag it down to a sliver: state.json keeps 21.
• Dock right and drag narrower: {"panelWidth":36,...}; the next launch opens at 36.

Fix: panel drag canceled when no terminal exists

Dragging the divider started a terminal on the first mouse move when none existed. Spawning moves focus, and the focus change canceled the pointer capture (Root.SetFocus → CancelPointerCapture), so the drag stopped after one step; it also switched an open Output or Problems panel to the Terminal tab. Reproduces on main:

bin/ttt --size 100x30 --exec "wait-for Explore; panel output; drag 60 12 60 6; debug /tmp/d.json; quit" .

The drag now only resizes (resizePanel). finishPanelResize starts a terminal when the drag ends, and only if the drag opened a closed panel. Covered by two e2e tests in tests/e2e/panel_drag_test.go, both failing on the old code:

• TestPanelDragWithoutTerminalKeepsDragAndTab: resizing an open Output panel keeps the drag alive, reaches the dragged height, starts no terminal, and stays on Output.
• TestPanelDraggedOpenStartsTerminalOnRelease: dragging a closed panel open starts no terminal mid-drag and one on release.

The repro above now ends at height 21 on the Output tab.

make test passes. make lint reports only pre-existing staticcheck SA5011 issues in unrelated test files.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between f669907 and 22651e2.

📒 Files selected for processing (10)

• docs-web/src/content/docs/reference/settings.md
• internal/app/app.go
• internal/app/callbacks.go
• internal/app/commands_view.go
• internal/app/exec_script.go
• internal/app/settings_apply_test.go
• internal/app/widgets.go
• internal/config/state.go
• internal/ui/content_split.go
• tests/e2e/panel_drag_test.go

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