Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

templates/portfolio/src/styles/theme.css

@@ -0,0 +1,62 @@
+/*
+  theme.css -- override any :root variable here to retheme the site.
+
+  This is the only file you need to edit to customize the site's visual
+  appearance. All defaults are listed below as comments. Uncomment and
+  change any value to override it.
+
+  Base.astro puts its defaults inside @layer base, so declarations here
+  (which are unlayered) always take priority -- no specificity tricks needed.
+
+  Note: this template defines explicit dark mode colors in Base.astro.
+  Overriding light-mode --color-* variables here won't affect dark mode.
+  To customize dark mode, also override --color-* variables inside a
+  @media (prefers-color-scheme: dark) block and/or in the :root.dark rule.
+*/
+
+:root {
+	/* --- Colors ---
+	--color-bg: #fafafa;
+	--color-text: #1a1a1a;
+	--color-muted: #6b7280;
+	--color-border: #e5e7eb;
+	--color-surface: #ffffff;
+	--color-accent: #7c3aed;
+	--color-accent-muted: #a78bfa;
+	*/
+
+	/* --- Typography ---
+	--font-sans: system-ui, -apple-system, sans-serif;
+	--font-mono: ui-monospace, monospace;
+	--font-size-sm: 0.875rem;
+	--font-size-base: 1.0625rem;
+	--font-size-lg: 1.25rem;
+	--font-size-xl: 1.5rem;
+	--font-size-2xl: 2rem;
+	--font-size-3xl: 2.75rem;
+	--font-size-4xl: 3.5rem;
+	*/
+
+	/* --- Spacing ---
+	--spacing-xs: 0.25rem;
+	--spacing-sm: 0.5rem;
+	--spacing-md: 1rem;
+	--spacing-lg: 1.5rem;
+	--spacing-xl: 2rem;
+	--spacing-2xl: 3rem;
+	--spacing-3xl: 4rem;
+	--spacing-4xl: 6rem;
+	*/
+
+	/* --- Layout ---
+	--max-width: 720px;
+	--wide-width: 1200px;
+	--radius: 4px;
+	*/
+
+	/* --- Transitions ---
+	--transition-fast: 150ms ease;
+	--transition-base: 200ms ease;
+	--transition-slow: 300ms ease;
+	*/
+}