Draft.js X compose: selector click/type timeout — harden draft_fast_path as default for tweetTextarea_0

[Trace824]

Summary

Selector click / type_text on X’s [data-testid=tweetTextarea_0] can hang ~10s because readiness, stability, and captureActionState burn the messaging budget on a busy SPA. draft_fast_path already skips that stack when detected; it should be the reliable default for this compose surface.

Repro

• Context: Active tab on x.com with compose open ([data-testid=tweetTextarea_0]).
• Steps:
  1. Call selector click then type_text on tweetTextarea_0 without CDP.
  2. Observe wall time and success/timeout (~10s messaging budget).
• Observed: hangs or timeouts; with draft_fast_path loaded, returns method: draft_fast_path in ≪10s (append quirks tracked separately).

Code pointers (verified against /workspace/FSB)

• extension/content/actions.js — captureActionState (~L217; avoids full document.body.innerText); isDraftLikeEditable / shouldUseDraftFastPath / findDraftEditableRoot (~L2121–2155); type fast-path (~L2959–3008) returns method: 'draft_fast_path'; click fast-path (~L2408).
• extension/content/messaging.js — tool dispatch / timeout budget (Unknown-tool and tool handlers).
• Local branch already contains draft_fast_path; harden detection + ensure always taken for tweetTextarea_0.

Proposed fix

Treat data-testid=tweetTextarea_0 (and nested contenteditable) as always-fast-path on x.com/twitter.com: skip smartEnsureReady / waitForPageStability / heavy captureActionState for click+type. Keep CDP click_at/insert_text as the recommended alternate path in docs.

Acceptance / regression

• Selector click+type on compose completes well under 10s and reports draft_fast_path.
• Non-Draft inputs unchanged (still use readiness/verify).
• Regression test or harness covering shouldUseDraftFastPath for tweetTextarea_0.

Owner

extension

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Priority: P1 · Owner: extension

[LakshmanTurlapati]

Closing as not planned: FSB won't add an X-only fast path, and #143 fixes the general insertion bugs and bounds hung-page waits, which covers the generic part.