Prepare v1.0.0-rc.16 pre-release

[enaboapps]

Prepare v1.0.0-rc.16 from current main. Synchronize all application and startup-launcher versions and the configuration regression expectation.

Closes #928.

Included since rc.15

• Main window redesign (Make the main window UI pleasant to look at and use #891)
• Switch interface guidance with a demonstration (Explain switch interface modes and key choices, with a demonstration #901)
• On-device word prediction as the only engine, with no vocabulary filter (Use the on-device model as the sole word prediction engine #880, Let word prediction suggest any word, including swearing #903)
• Two-word phrase suggestions in alternate slots (Alternate two-word phrase predictions with single words in the suggestion row #905)
• Casing rules for suggestions (Handle casing properly in word prediction #914)
• A spare prediction worker so reopening the keyboard does not reload the model (Keep a loaded prediction worker ready so reopening the keyboard does not reload the model #922)
• Recovery from one slow prediction call without Retry (Recover word prediction from one slow call without needing Retry #924)
• Suggestions held until the next word after context is lost mid-word (Hold suggestions until the next word after the prediction context resets mid-word #926)
• Scanning panel, mouse panel and pointer speed changes (Add a scannable mouse panel #856 to Move scanning panels out of the pointer's way #876)

Validation at 38b2bda

• Node 24.13.0 and Rust 1.97.1.
• Frontend lint, updater tests and production build passed.
• Rust formatting and Clippy with warnings denied passed; 583 unit tests and seven configuration tests passed.
• Startup launcher formatting, Clippy and both tests passed.
• npm audit passes at the high level. It reports two moderate findings.

Not verified in the running app: the three prediction changes #922, #924 and #926.

Publication will verify signing, release checksums and the updater feed.

🤖 Generated with Claude Code