fix(words): color picker uses applyCommand (no sema) + onchange instead of oninput

Two related fixes to the color picker UX:

1. Swatches now call applyCommand({type:'toggleMark', mark:'color:#x'})
   directly instead of runCommand('color:#x'). runCommand emits the
   'commit-set-format' sema event (which fires sound + visual feedback
   on the editor surface). For discrete color picks the sema event is
   noise — applyCommand bypasses the trigger and just mutates the doc.

2. Native <input type=color> uses `onchange` instead of `oninput`.
   `oninput` fires continuously while the user drags the OS color
   picker — each fire was queueing a separate command + sema event,
   producing a horror cascade of sound / visual flashes on every
   pixel of the slider drag. `onchange` only fires when the user
   releases / commits the picker (closes the OS popup), so we get
   exactly one command per intent.

Same pattern applied to both Foreground and Background pickers
+ the clear (×) buttons.

Sema events are still emitted by the rest of the drawer's action
chips (run via runCommand) because those are user-facing intent
actions (Bold, Italic, etc.) where the perceptual feedback aligns
with the user's notion of "I just did a thing". Color slider drags
are NOT in that category — they're continuous parameter tuning.

Verified: clicking the red swatch on selected "ActiveUI" produces
the expected red <span> in the document AND the trace shows no new
commit-set-format event (was previously firing on every swatch
click, drowning audio + animation).

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

src/uix/eidos/components/words/words-drawer.svelte

@@ -305,7 +305,7 @@
 				title={preset}
 				aria-label={`Set foreground to ${preset}`}
 				onmousedown={(e) => e.preventDefault()}
-				onclick={() => s.runCommand(`color:${preset}` as never)}
+				onclick={() => s.applyCommand({ type: 'toggleMark', mark: `color:${preset}` as never })}
 			></button>
 		{/each}
 		<input
@@ -313,9 +313,9 @@
 			data-words-drawer-color-input
 			value={currentParametricMark(s.activeMarks, 'color') || '#000000'}
 			aria-label="Pick custom foreground color"
-			oninput={(e) => {
+			onchange={(e) => {
 				const v = (e.currentTarget as HTMLInputElement).value;
-				s.runCommand(`color:${v}` as never);
+				s.applyCommand({ type: 'toggleMark', mark: `color:${v}` as never });
 			}}
 		/>
 		{#if currentParametricMark(s.activeMarks, 'color')}
@@ -325,7 +325,7 @@
 				title="Clear foreground"
 				aria-label="Clear foreground color"
 				onmousedown={(e) => e.preventDefault()}
-				onclick={() => s.runCommand('color:' as never)}
+				onclick={() => s.applyCommand({ type: 'toggleMark', mark: 'color:' as never })}
 			>×</button>
 		{/if}
 	</div>
@@ -341,7 +341,7 @@
 				title={preset}
 				aria-label={`Set background to ${preset}`}
 				onmousedown={(e) => e.preventDefault()}
-				onclick={() => s.runCommand(`bgcolor:${preset}` as never)}
+				onclick={() => s.applyCommand({ type: 'toggleMark', mark: `bgcolor:${preset}` as never })}
 			></button>
 		{/each}
 		<input
@@ -349,9 +349,9 @@
 			data-words-drawer-color-input
 			value={currentParametricMark(s.activeMarks, 'bgcolor') || '#ffff00'}
 			aria-label="Pick custom background color"
-			oninput={(e) => {
+			onchange={(e) => {
 				const v = (e.currentTarget as HTMLInputElement).value;
-				s.runCommand(`bgcolor:${v}` as never);
+				s.applyCommand({ type: 'toggleMark', mark: `bgcolor:${v}` as never });
 			}}
 		/>
 		{#if currentParametricMark(s.activeMarks, 'bgcolor')}
@@ -361,7 +361,7 @@
 				title="Clear background"
 				aria-label="Clear background color"
 				onmousedown={(e) => e.preventDefault()}
-				onclick={() => s.runCommand('bgcolor:' as never)}
+				onclick={() => s.applyCommand({ type: 'toggleMark', mark: 'bgcolor:' as never })}
 			>×</button>
 		{/if}
 	</div>