Learn/suggest words from user's own typing history (personal vocabulary)

[Rahulsharma0810]

Problem

Cotabby's suggestions are based on the live caret prefix plus static, manually-entered settings (name, languages, custom writing-style rules — see WelcomePersonalizeStepView, SuggestionSettingsModel). There is no mechanism that learns from what the user has actually typed/accepted over time, so it never starts suggesting a user's own recurring words, names, jargon, or phrasing back to them.

Request

Add a privacy-first, local, opt-in mechanism that learns from the user's own typing/accepted-completion history and feeds that back into suggestions (e.g. as part of "Use My Instructions" / custom-rules context), so words the user has already typed repeatedly get suggested proactively.

Related open issues (please upvote/subscribe if this matters to you)

• [Feature] Persist Context Across Restarts #446 — @jkrauska — "Persist Context Across Restarts": confirms Cotabby currently forgets everything on daemon restart, proposes an encrypted local SQLite history store.
• [Feature Request] Adaptive Text Personalization (Style Learning) #748 — @FuJacob — "Adaptive Text Personalization (Style Learning)": requests learning from accepted/rejected suggestions to adapt vocabulary and phrasing over time.
• Add typing-history personalization with local continuous learning #3 — @FuJacob — "Add typing-history personalization with local continuous learning": original design proposal for a local personalization DB feeding a compact learned-preference summary into "Use My Instructions" mode (closed/Done, but functionality doesn't appear to have shipped — [Feature] Persist Context Across Restarts #446/[Feature Request] Adaptive Text Personalization (Style Learning) #748 were filed afterward asking for the same thing).
• Exploration: semantic cache with self-learning loop #101 — @Jam-Cai — "Exploration: semantic cache with self-learning loop": related design exploration for reusing prior accepted (context, completion) pairs, cross-references Add typing-history personalization with local continuous learning #3.

Filing this as a distinct, findable issue that ties the above together, since the underlying capability (personal vocabulary/word-history learning) still doesn't exist in main as of this writing (verified via source: no PersonalizationStore/learnedPreference/typingHistory anywhere in the codebase).