feat: zoom with scroll and note tabs

[adrianataetae-coder]

Two quality-of-life improvements for the notes and code editors:

1. Zoom with Ctrl+Scroll

Add the ability to zoom in/out of notes and code snippets using Ctrl + mouse wheel. This scales the entire editor content (text, code blocks, Mermaid diagrams, tables) proportionally.

• Zoom range: 0.5x to 3x (step 0.1)
• Reset: Ctrl+0 resets zoom to 1x
• Persistence: Zoom level is saved per space (notes/code) in store.app
• Smooth transition: CSS transition on zoom change

Notes editor: Uses CSS zoom on the editor container.
Code editor: Uses transform: scale() on the CodeMirror element with container height adjustment.

2. Note Tabs (Open in new tab)

Add tab support for notes via right-click context menu → "Open in new tab".

• Tabs appear as a bar above the editor
• Middle-click or × button to close tabs
• Context menu: "Close tab", "Close other tabs", "Close all tabs"
• Tab state is persisted in store.app.notes.tabs
• Tabs sync with the note list selection

Motivation

When working with long notes or code snippets at larger font sizes, the current zoom (via preferences) is not granular enough. Ctrl+scroll provides a natural, discoverable way to adjust zoom on the fly.

Tabs allow keeping multiple notes open simultaneously without losing context, similar to how browser tabs work.

Implementation

I have a working implementation based on v5.10.0 with:

• useNotesZoom / useCodeZoom composables
• useNoteTabs composable
• IPC handlers for main-menu:font-size-reset that also reset zoom
• i18n keys for tab context menu
• Portable .exe build tested on Windows

Happy to submit a PR if there's interest.