Six more vendored families alongside the existing Noto Sans (Inter,
Source Sans 3, Noto Serif, Crimson Text, Arvo, IBM Plex Mono -- sans/
serif/slab/mono variety), all OFL-licensed with their own per-family
license file in app/fonts/ since each has a different copyright holder.
Static Regular/Bold/Italic/BoldItalic builds only -- variable-font-only
families (Inter and Source Sans's current Google Fonts releases, plus
Playfair Display/Lora/Merriweather) were skipped in favor of static
builds from their own upstream repos, keeping every family's loading
code uniform with what was already there. Considered but deliberately
left out: Georgia -- a proprietary Microsoft core font, not freely
redistributable, unlike everything else vendored here.
Also moves the bold/italic/underline/color toolbar below the
contenteditable box per request, and reorders the dialog's Settings
card to a more natural family-then-size order.
Fixes a latent migration bug this surfaced: migration 20 (static image
widget) used Base.metadata.create_all, which creates every table
declared in Base.metadata that's missing, not just its own new one --
harmless when nothing else pending, but once TextWidgetConfig existed
it would silently pre-create text_widget_configs (in whatever shape
models.py currently declares) before migration 21 got a turn, so
migration 21's own CREATE TABLE (or a later ALTER TABLE adding
font_family) would collide with a table create_all had already leaked
into existence. Both migrations 20 and 21 now use raw, frozen CREATE
TABLE SQL instead, matching migration 17's existing precedent for
exactly this reason.
