Status presenters (showWarning/showError/showStatus and extension/tool
error presenters) baked theme.fg() into Text at construction, so a
warning shown while the auto-theme default guess was dark kept the
dark-mode color after async appearance detection switched the active
theme to light — dark-catppuccin Mocha yellow on the light Latte
background (1.12:1 contrast, effectively invisible).
Add Text.setStyleFn(), a foreground styler evaluated at render time, and
route the transient status presenters through it. Because the coding
agent invalidates status components on onThemeChange, a theme swap now
re-shapes them against the live theme instead of replaying the palette
active when they were constructed.
Fixes#6337
roboomp
93d032a144