Add Rust function runtime template support

[ChiragAgg5k]

What does this PR do?

Adds support for the new Rust function runtime template in function creation flows.

• Updates the SDK dependency to the commit that includes the Rust runtime enum.
• Shows Rust in the starter quick-start runtime list when the API exposes rust-1.83.
• Selects and validates template/deploy runtimes from API-provided runtimes instead of guessing from enum string prefixes.
• Adds Rust runtime icons for light/dark color and grayscale themes.
• Applies the same safer runtime fallback behavior to public function deploy links.

Test Plan

• bun run format
• bun run check
• bun run lint
• bun run build
• Local Appwrite endpoints return rust-1.83 in /v1/functions/runtimes and starter template runtimes after enabling _APP_FUNCTIONS_RUNTIMES=node-22,rust-1.83.
• Playwright walkthrough against local Appwrite — see screenshots below.

Screenshots

1. Quick start — Rust card in runtime list

The starter quick-start now lists Rust alongside Node.js when the API exposes rust-1.83, with the new color icon.

2. template-starter?runtime=rust-1.83 — runtime preselected

Navigating to the starter template with runtime=rust-1.83 resolves the runtime via the API list and preselects Rust - 1.83 (form field and right-hand summary).

3. Manual create — runtime dropdown shows Rust

Manual function create exposes Rust - 1.83 in the runtime dropdown, sourced from the API runtimes list.

4. Public /functions/deploy — Rust runtime preselected

The public deploy link resolves runtime=rust-1.83 against API-provided runtimes (no more enum prefix guessing) and preselects Rust - 1.83.

Related Issue

#XXXX

[greptile-apps]

Greptile Summary

This PR adds Rust (rust-1.83) function runtime support by updating the SDK dependency, adding four Rust SVG icon variants, migrating template-[template]/+page.svelte to Svelte 5 runes, and switching runtime resolution across all creation flows to validate against the API-provided runtime list instead of guessing from enum string prefixes. The logic changes are well-reasoned and the safer fallback behaviour in the public deploy flow is a solid improvement.

Confidence Score: 5/5

Safe to merge — no P0 or P1 issues; only P2 style/migration observations.

All identified issues are P2: the $state(writable(...)) mix is non-breaking, and the connectBehaviour effect behaviour matches the previous Svelte 4 version. Core runtime resolution and icon lookup logic is correct and tested per the PR description.

template-[template]/+page.svelte for the isSubmitting runes/store mix and the connectBehaviour effect.

Important Files Changed

Filename	Overview
src/lib/stores/runtimes.ts	Made runtime parameter optional, added early-return guard, and added 6 new runtime icon mappings (dotnet, java, swift, kotlin, cpp, rust). Correct switch(true) logic.
src/routes/(console)/project-[region]-[project]/functions/create-function/+page.svelte	Replaces prefix-split deduplication with runtime.key-based Map, filters starter cards from API runtimes, removes .slice(0,6) cap. Correct, but key-based last-write-wins and removed grid cap were flagged in prior review.
src/routes/(console)/project-[region]-[project]/functions/create-function/template-[template]/+page.svelte	Partially migrated to Svelte 5 runes; new selectInitialRuntime() validates runtimes against API list. isSubmitting = $state(writable(false)) is an unusual runes+store mix but not broken.
src/routes/(public)/functions/deploy/+page.ts	Runtimes API call moved before deployment data construction, adds redirect guard when no runtimes are available, and validates URL runtime param against API list instead of hardcoding node-18.0.
src/routes/(console)/project-[region]-[project]/functions/create-function/deploy/+page.svelte	Icon lookup switched from r.$id to r.key, fallback changed from hardcoded node-18.0 to first API-provided runtime. Cleaner and correct.
src/routes/(console)/project-[region]-[project]/functions/create-function/manual/+page.svelte	Added ?? 'empty' fallback for unknown icon names. Minimal, correct change.
src/routes/(console)/project-[region]-[project]/functions/create-function/repository-[repository]/+page.svelte	Added ?? 'empty' fallback for unknown icon names. Minimal, correct change.
static/icons/dark/color/rust.svg	New Rust SVG icon (brand color #CE422B). Dark and light color variants are byte-for-byte identical, which is intentional for a strong brand color.

_{Reviews (2): Last reviewed commit: "feat: add rust function runtime template..." | Re-trigger Greptile}