Add a setting for longer inline completions

[seeARMS]

Fixes #2.

The old prompt requested only 3–10 words, and cleanup truncated suggestions to one sentence, 12 words, or 96 characters. Add a persisted More actions → Completion length setting: Short (default), Medium, and Long. The selected target controls both generation instructions and the sentence/word/character limits so longer responses survive Tab acceptance.

Changing length also cancels an in-flight suggestion and restores editor focus immediately so the new request can run. Invalid saved values fall back to Short.

Validation:

• All 18 Chromium browser tests passed against the combined production build, including the 11 spacing regressions from Fix partial-word boundaries in inline completions #3.
• Seven length tests cover default behavior, Medium/Long persistence after reload, complete Tab acceptance (including a 60-word, 346-character response), long suggestions beginning inside a word, invalid preferences, stale response rejection, and touch interaction at 390px width.
• Browser tests control only the model API response; the editor, hooks, cleanup, preference storage, and key handlers run normally.
• Also drove Chrome with real Gemini Nano in the final production build: selected Long, confirmed it remained selected after reload, generated a 48-word continuation across four sentences, and accepted the full text with Tab (53 words / 300 characters including the existing draft).
• npm run typecheck, npm run build, and git diff --check passed.

Word ranges are generation targets; the local model can still return a shorter suggestion.

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Status	Name	Latest Commit	Updated (UTC)
🔵 In progress View logs	draftside	03b551b	Sep 06 2026, 05:18 PM