feat(settings): add deletePluginSetting method and integrate into DbSettings...

    return result == SQ3.DONE or result == SQ3.OK

end

--[[--

Delete a single plugin setting from the plugin_settings table.

@param key string Setting key

@return boolean success

--]]

---Database:deletePluginSetting.

function Database:deletePluginSetting(key)

    if not key then

        self.plugin:logErr("BookloreSync Database: deletePluginSetting called without key")

        return false

    end

    key = tostring(key)

    local stmt = self.conn:prepare("DELETE FROM plugin_settings WHERE key = ?")

    if not stmt then

        self.plugin:logErr("BookloreSync Database: Failed to prepare deletePluginSetting:", self.conn:errmsg())

        return false

    end

    local ok, err = pcall(function() stmt:bind(key) end)

    if not ok then

        self.plugin:logErr("BookloreSync Database: Bind failed in deletePluginSetting:", err)

        stmt:close()

        return false

    end

    local result = stmt:step()

    stmt:close()

    return result == SQ3.DONE or result == SQ3.OK

end

--[[--

Return all plugin settings as a key→value Lua table.

See **Sync Behavior** in the settings menu for:

- Automatic / Manual / Custom mode

- Auto-sync on suspend

- Connect WiFi on suspend

- Ask to enable WiFi

- Automatic mode

- Manual only (cache everything) mode

With **Automatic** mode (or **Custom** with both suspend toggles enabled), suspend now queues and attempts to upload both the current session and current progress immediately.

With **Automatic** mode, suspend queues and attempts to upload both the current session and current progress immediately.

If **Use Dev Builds** is enabled, startup auto-check for stable releases is skipped. Manual **Check for Updates** uses the URL from `dev-build.location` instead.

> **Note:** The **Use Dev Builds** toggle is only shown when `dev-build.location` exists in the plugin directory.

> If the file is missing at startup, the plugin automatically disables the dev-build channel (`use_dev_builds = false`).

---

## Manual update check

|---|---|

| Toggle BookLore Sync | Enables or disables the plugin. No sessions are tracked while it is disabled. |

| Sync Pending Sessions | Immediately uploads all queued sessions, ratings, and annotations. |

| Toggle Manual Sync Only | Switches between automatic sync (after every session) and manual sync (only when triggered). |

| Toggle Manual Sync Only | Switches between **Automatic** mode (syncs in background, including suspend/resume paths) and **Manual only (cache everything)** mode (queue only, sync when triggered). |

| Test Connection | Runs a connection test and shows the result as a notification. |

| Sync Shelf | Triggers a shelf sync immediately. |

| Pull Current Book Progress | Pulls remote progress for the currently open book and applies conflict strategy rules. |