fix: native template autocomplete and durable indicator migration
Template file fields used an unstyled <datalist>, not Obsidian's native suggest popup. Replace it with TemplateFileSuggest, an AbstractInputSuggest<TFile> matching Templater's own FileSuggest/FolderSuggest pattern exactly. Requires Obsidian >=1.4.10; minAppVersion corrected. The coloured-indicator default never reached existing installs: every install that loaded before that default changed had already persisted the prior default (indicatorMode: 'any') to data.json as if it were a deliberate choice, and Object.assign-based settings merging always prefers a value already on disk over a new code default. Hand-editing data.json directly does not fix this durably either -- Obsidian holds settings in memory while a vault is open and overwrites external edits on its own save cycle. Add a one-time, code-level migration: on load, an install with a persisted indicatorMode of 'any' and no indicatorModeMigrated flag is promoted to 'systems' and the flag is persisted immediately, so it survives even a session with no further settings changes. Any indicatorMode chosen after the flag exists, any (deliberately) included, is never touched again.
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