feat(themes): add Kanagawa, Atom One, 1984 palettes; regroup OSS Classics by family (#390)

* feat(themes): add Kanagawa, Atom One, 1984 palettes; group OSS Classics by family

Adds three upstream-faithful theme families to Open Source Classics and
restructures the picker so the section is no longer alphabetically wild.

New themes (9 total):
- Kanagawa (rebelot/kanagawa.nvim): Wave, Dragon, Lotus
- Atom One (Th3Whit3Wolf/one-nvim): Dark, Light
- 1984 (juanmnl/vs-1984): Default, Cyberpunk, Light, Orwell
  (Fancy + Unbolded skipped — identical palette to Default, style-only)

Each theme defines the full token set (--bg-*, --accent, --text-*, all
--ctp-*, --waveform-*, --positive/warning/danger, --select-arrow), so
login screen, queue sidebar tabs, and all subpages inherit the palette
without component-level overrides.

Picker restructure:
- ThemeDef gains optional `family?: string`
- Open Source Classics regrouped: 1984, Atom One, Catppuccin, Dracula,
  Gruvbox, Kanagawa, Nightfox, Nord
- Family headings rendered inline (grid-column: 1 / -1) when family
  changes; new .theme-family-header style in components.css
- Theme scheduler dropdown labels prefixed with family for context

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* chore(release): sync Cargo.lock to 1.45.0-dev

src-tauri/Cargo.lock

@@ -3706,7 +3706,7 @@ dependencies = [
 
 [[package]]
 name = "psysonic"
-version = "1.44.0-rc1"
+version = "1.45.0-dev"
 dependencies = [
  "biquad",
  "discord-rich-presence",