Remove ticket 048 (implemented: multi-accent and brighter theme variants)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

tickets/048-multi-accent-and-brighter-theme-variants.md

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-# 048 — Multi-accent and brighter variants for built-in themes
-
-## Summary
-
-`webapp/src/lib/themes.ts` `BUILTIN_THEMES` (dark, light, red, green,
-blue, yellow, pink, orange) are each essentially monotone with a single
-accent color. The wishlist asks for 2-3 accents per theme, plus brighter
-variants of the more muted presets — e.g. keep the current "Green" as-is
-but give it added accents, and introduce a new, brighter "Light Green";
-similarly add suitable additional accents to the default "Light" and
-"Dark" themes.
-
-## Scope
-
-- Extend the `ThemeVars` shape (or the built-in theme records) to carry 2-3
-  accent colors per theme instead of one, and update anywhere a single
-  accent variable is consumed (charts, buttons, highlights) to pick from
-  the accent set appropriately.
-- Add accents to existing "Light" and "Dark" defaults.
-- Add accents to existing colour presets (red, green, blue, yellow, pink,
-  orange) without changing their current base look.
-- Add new brighter variants alongside the existing muted ones (e.g.
-  "Light Green" alongside "Green"), following the same naming pattern for
-  any other presets that warrant a brighter counterpart.
-- Update the settings UI preset picker to list the new theme options.
-
-## Acceptance criteria
-
-- Each built-in theme (existing and new) exposes 2-3 accent colors,
-  consumed by at least the chart palette (see ticket 046) so charts
-  visibly use more than one accent per theme.
-- New brighter variants (at least "Light Green") are selectable in
-  settings and render distinctly brighter than their muted counterpart.
-- Existing theme selections are visually unchanged aside from the added
-  accents (no unrelated base color shifts).
-
-## Depends on
-
-None (pairs well with 047, since accents should apply to
-user-provided/custom styles too where applicable).