[andiwand]

Fixes #725.

Problem

Text-to-speech uses each child of document.body as one paragraph. A PDF from the core has one wrapper div.d below the body. So the whole PDF was one paragraph. The aria-hidden glyph layer (.vis) and the selection layer (.sel) both contain the text, so innerText had the text twice.

The engine rejects text longer than TextToSpeech.getMaxSpeechInputLength() (4000 characters). The deprecated OnUtteranceCompletedListener gets the rejection as a completion. Then TTS skipped the remaining <script> children, and the status went directly to "Finished". On main with a 9-page PDF, the engine logs Text too long: 53672 chars.

Changes

• PageView.getParagraph: if the page has .p > .sel, read one selection layer for each page. Join the textContent of its lines. innerText does not work here, because the core gives pages content-visibility:auto, and pages off screen have an empty innerText. Other formats still use document.body.childNodes.
• TtsActionModeCallback.paragraph: split text longer than the engine limit. The split is at a sentence boundary (BreakIterator with the document locale), else at a space, else at the limit.
• Each paragraph gets its own utterance ID. Only the completion of its last part moves to the next paragraph. silence() clears the expected ID before stop(), because stop() also reports a completion. Before this change, "next" and "previous" moved one paragraph too far.

Tests

On the Pixel_6_Pro emulator (Pro debug build). A DevTools wrapper around window.paragraphListener logged the text that TTS received:

Test	Result
Casio_WVA-M650-7AJF.pdf (9 pages), play	Page 1 (5425 characters) is read in parts. The engine does not log Text too long.
next ×3, previous, pause, play	Page 2, 3, 4, then back to 3. Pause, then play reads page 3 again.
2-page sample PDF, no button taps	Page 1, page 2, "Finished."
about.odt	Reads to "Finished."

spotlessCheck, testProDebugUnitTest, lintProDebug, and lintLiteDebug pass. I did not run connectedAndroidTest locally.

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