feat: `.stignore` editor with presets (Obsidian, dev projects, photos)

[gitcoder89431]

Summary

Add a TUI editor for .stignore with common preset patterns, solving one of the most frequent Syncthing setup pain points.

Motivation

Managing .stignore is a top community pain point. People syncing Obsidian vaults need to ignore .obsidian/workspace, .obsidian/cache; devs need to ignore node_modules/, .git/, target/; photographers don't need RAW thumbnails. Currently this requires manual file editing with no guidance.

Proposed UX

TUI: new Ignore tab or accessible via i keybind

• List current ignore rules with toggle on/off
• a to add a custom pattern
• d to delete a rule
• Preset menu (p) with one-click categories:

Preset	Patterns added
Obsidian	.obsidian/workspace, .obsidian/cache, .obsidian/plugins/*/data.json
Dev project	node_modules/, .git/, target/, dist/, .env
macOS	.DS_Store, ._*, .Spotlight-V100
Photos	*.thumb, *.thm, @eaDir/ (Synology)
KeePass	*.lock (lockfile only, not the .kdbx itself)

CLI

meshd ignore ls                    # list current rules
meshd ignore add 'node_modules/'   # add a pattern
meshd ignore preset obsidian       # apply Obsidian preset
meshd ignore preset dev            # apply dev preset

Implementation Notes

• .stignore lives at ~/meshd/.stignore
• Trigger a rescan after saving (/rest/db/scan)
• Syncthing ignore syntax: glob patterns, ! for negation, (?i) for case-insensitive
• Reference: https://docs.syncthing.net/users/ignoring.html

[gitcoder89431]

Shipped: meshd ignore add <pattern>, meshd ignore list, meshd ignore preset <name> (obsidian/dev/photos/keepass). MCP tools add_ignore and list_ignore also added.