The Home-ribbon Color / Linetype / Lineweight chips live on the
global `self.ribbon` and were never re-seeded from the active tab's
header, so opening a fresh file, creating a new tab, or switching
between tabs kept showing whatever the prior tab had picked. Layer
worked already because `self.tabs[i].active_layer` is per-tab.
Two halves of the fix:
1. When the user picks a new value from the ribbon with no entity
selection, persist it into that tab's `document.header`
(CLAYER + handle, CECOLOR, CELTYPE + handle, CELWEIGHT) and
mark the tab dirty. Switching back later reads the saved value
back out.
2. After every event that changes the active tab — `FileOpened`,
`TabNew`, `TabSwitch`, `TabClose` (including the
close-last-and-reset path) and `UnsavedDialogDiscard` — call
`sync_ribbon_from_selection()` so the chips track the new
tab's defaults (or its current selection).
Closes#21
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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