fix(TextSelectionLayer): avoid reading destroyed ref box on document pointerdown

[MathiasWP]

TextSelectionLayerState.#pointerdown read this.opts.ref.current as its first statement, before the enabled check.

That box is a $derived owned by the Content component. When the document pointerdown listener outlives its component (reproducible by rapidly toggling a Dialog/Popover open/closed), every pointerdown anywhere in the document re-executes a destroyed derived and emits derived_inert — permanently, for any click target.

Fix: check the plain-boolean #enabledSnapshot first. Same logical condition; a leaked listener no longer touches the destroyed derived.

Notes

• Distinct from DismissibleLayer: derived_inert warning — afterSleep(1) timer reads ref.current after the layer is destroyed #2080 / fix: cancel DismissibleLayer afterSleep timer on destroy (#2080) #2087 (DismissibleLayer). Here bitsTextSelectionLayers is correctly emptied — only the listener leaks — so fix: cancel DismissibleLayer afterSleep timer on destroy (#2080) #2087 does not cover it.
• Each leaked listener emits exactly 1 warning per pointerdown, synchronously. fix: cancel DismissibleLayer afterSleep timer on destroy (#2080) #2087's DismissibleLayer case emits 6 (3 + 3, split by the 10ms debounce).
• Verified on Chromium and WebKit: 2 warnings → 0.
• Does not address Dynamic updates to Avatar result in derived_inert #2050, derived_inert warning in useFloating: race between autoUpdate rAF and Svelte 5 effect teardown #2083, LinkPreview: pointerup's afterSleep(1) timer isn't cancelled on close, same shape as #2080 #2103, Select: scrollIntoViewTimer (afterSleep) never cancelled on destroy, same shape as #2080/#2103 #2106.
• The underlying removeEventListener leak is still unresolved and worth a separate issue; this guard makes it harmless.

Related: #2080, #2105

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Latest commit: 9442b98

The changes in this PR will be included in the next version bump.

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[MathiasWP]

CI red here is #2102's race, not this change — both failures are expectNotExists on outside-click dismissal (the click beats DismissibleLayer's deferred afterSleep(1) attach), and #2102 already patches both of these tests.

Local A/B on context-menu, 3 runs each: baseline 4/2/3 failures, with this change 3/3/4. Indistinguishable.

Should go green once #2102 lands; happy to rebase onto it instead if preferred.

[huntabyte]

Thank you!