Apply a template to an existing note

[h4yfans]

Apply a template to an existing note

Templates previously only applied at note creation, folder-default, and journal-default. This adds the ability to apply a template to an existing individual note from two entry points.

Behavior

• Entry points: right-click a note in the sidebar tree → Apply Template, or the note-page ⋮ (more) menu → Apply Template. Works in both the virtualized and legacy tree render paths.
• Empty note: applies immediately.
• Note with content: confirmation dialog with two choices:
  • Replace content & add template details — replaces the body and merges the template's tags/properties (non-destructive: existing tags kept via union; on a property-key conflict the note's existing value wins).
  • Replace content only — replaces the body, leaves tags/properties untouched.
• {{title}} resolves to the note's current title.
• If the note's editor is open, its content updates live.

Implementation

• Additive IPC method notes:apply-template ({ noteId, templateId, mode: 'full' | 'body' }) → contract + rpc + handler.
• Main command applyTemplateToNote: pure buildTemplateApplyUpdate (tag union, existing-wins property merge, {{title}}), reuses updateNoteCommand (file + index + sync), then feeds the open editor's Y.Doc.
• Extracted replaceNoteBodyInCrdt from the vault watcher into a shared crdt-feed module so external-edit and template-apply share one fragment-replace path.
• Renderer: TemplateSelector gains an apply mode; new confirmation dialog; a self-contained orchestrator dialog mounted at both entry points (inert while closed).

Notes

• Backward compatible: no DB schema, sync-protocol, vault file-format, or settings changes — additive IPC only.
• Full-mode apply on an open, tag-bearing note also syncs the live Y.Doc tag array, so the CRDT writeback can't revert the template's added tags on the next body edit.
• Docs updated under apps/docs/src/user-guide/templates.md.

Verification

• Desktop main suite (3408) and renderer suite (5071) pass; typecheck (web+node), lint (0 errors), ipc:check, i18n:check, docs-impact + docs:build all green.
• Not run: live-Electron manual smoke (headless env) — recommend a quick real-app pass on the open-note full-mode tag case before release.

Test plan

• Right-click an empty note → Apply Template → content appears, no dialog.
• Right-click a note with content → Apply Template → confirm dialog; verify both replace choices.
• Open a note in the editor, apply a tag-bearing template in full mode, edit the body → confirm merged tags survive.
• ⋮ menu entry on the note page behaves the same.

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit a7a2228.}

[codecov]

Codecov Report

❌ Patch coverage is 80.31496% with 25 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...renderer/src/components/note/template-selector.tsx	60.00%	10 Missing ⚠️
.../components/note/apply-template-to-note-dialog.tsx	85.36%	6 Missing ⚠️
apps/desktop/src/main/ipc/notes-handlers.ts	25.00%	3 Missing ⚠️
...desktop/src/renderer/src/components/notes-tree.tsx	50.00%	2 Missing ⚠️
apps/desktop/src/main/vault/watcher.ts	50.00%	1 Missing ⚠️
.../components/note/apply-template-confirm-dialog.tsx	83.33%	1 Missing ⚠️
...renderer/src/components/virtualized-notes-tree.tsx	0.00%	1 Missing ⚠️
apps/desktop/src/renderer/src/pages/note.tsx	66.66%	1 Missing ⚠️

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