Update Swedish localization with new strings and translations

[reinew]

This pull request updates Swedish translations across several files. Several existing labels and descriptions have also been refined for accuracy and consistency.

[Copilot]

Pull request overview

This PR updates the Swedish (sv) localization to reflect newly added UI strings and refines several existing translations for clarity and consistency with the English source locale.

Changes:

• Add Swedish strings for new settings/options (e.g., navigation bar position, MCP/server options, model source variants).
• Refine existing labels and helper texts in Models/Discover/Developer/Chat screens.
• Extend Swedish strings for new model-loading configuration options.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
sv/settings.json	Adds navigation bar position strings; refines language label.
sv/models.json	Refines “no models” messaging; adjusts table labels; adds “switch model source” strings.
sv/discover.json	Updates search placeholder to match updated behavior; minor error text tweak.
sv/developer.json	Updates model placeholder; adds MCP option text and new endpoint labels.
sv/config.json	Adds new model load parameter strings (MoE/CPU layers, KV cache offload, parallel sessions, etc.).
sv/chat.json	Adds actions/errors around clearing last used model; adds new plugin/MCP error strings; adds speculative decoding tooltip/summary strings.

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